Lenovo ThinkPad T420i

Lenovo ThinkPad T420i
ThinkPad T420 and T420i
Hardware Maintenance Manual
Note: Before using this information and the product it supports, be sure to read the general information
under Appendix A “Notices” on page 167.
Fourth Edition (November 2011)
© Copyright Lenovo 2011.
LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant a General Services Administration
“GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
Contents
About this manual. . . . . . . . . . .
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Chapter 5. Status indicators . . . . .
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Chapter 6. Fn key combinations . . .
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Chapter 7. FRU replacement
notices . . . . . . . . . . . . . . . .
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Chapter 3. General checkout . . . . .
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Chapter 1. Safety information . . . . . . 1
General safety . . . . . . . . . . . . . . .
Electrical safety . . . . . . . . . . . . . .
Safety inspection guide . . . . . . . . . . .
Handling devices that are sensitive to electrostatic
discharge. . . . . . . . . . . . . . . . .
Grounding requirements . . . . . . . . . . .
Safety notices (multilingual translations) . . . . .
Laser compliance statement (multilingual
translations) . . . . . . . . . . . . . . . .
Chapter 2. Important service
information . . . . . . . . . . . . . .
Strategy for replacing FRUs . . . . . . . .
Strategy for replacing a hard disk drive . .
Important notice for replacing a system
board . . . . . . . . . . . . . . .
How to use error message . . . . . . .
Strategy for replacing FRUs for CTO, CMV, and
GAV . . . . . . . . . . . . . . . . . .
Product definition . . . . . . . . . . .
FRU identification for CTO, CMV, and GAV
products . . . . . . . . . . . . . .
What to do first . . . . . . . . . . .
Checkout guide . . . . . . . . . . .
Diagnostics using PC-Doctor for DOS.
Lenovo ThinkVantage Toolbox . . . .
FRU tests . . . . . . . . . . . .
Power system checkout . . . . . . . .
Checking the ac power adapter . . .
Checking operational charging . . .
Checking the battery pack . . . . .
Checking the backup battery . . . .
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Chapter 4. Related service
information . . . . . . . . . . . . . .
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Restoring the factory contents by using Recovery
Disc Set . . . . . . . . . . . . . . . . .
Passwords . . . . . . . . . . . . . . . .
Power-on password . . . . . . . . . . .
Hard-disk password. . . . . . . . . . .
Supervisor password . . . . . . . . . .
How to remove the power-on password . . .
How to remove the hard-disk password . . .
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© Copyright Lenovo 2011
Power management . . .
Screen blank mode . .
Sleep (standby) mode .
Hibernation mode . .
Symptom-to-FRU index . .
Numeric error codes .
Error messages . . .
Beep symptoms . . .
No-beep symptoms . .
LCD-related symptoms
Intermittent problems .
Undetermined problems
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Screw notices . . . . . . . . . . . . . .
Retaining serial numbers. . . . . . . . . .
Restoring the serial number of the system
unit . . . . . . . . . . . . . . . .
Retaining the UUID . . . . . . . . . .
Reading or writing the ECA information . .
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Chapter 8. Removing and replacing a
FRU . . . . . . . . . . . . . . . . . .
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Before servicing ThinkPad T420 and T420i . .
1010 Battery pack . . . . . . . . . . . .
1020 ExpressCard blank bezel . . . . . . .
1030 Serial Ultrabay Enhanced device or travel
bezel . . . . . . . . . . . . . . . . .
1040 Hard disk drive (HDD) and solid state drive
(SSD) . . . . . . . . . . . . . . . . .
1050 DIMM slot cover . . . . . . . . . . .
1060 DIMM (in the slot on the underside of the
computer) . . . . . . . . . . . . . . .
1070 PCI Express Mini Card for wireless WAN .
1080 Keyboard . . . . . . . . . . . . .
1090 DIMM (in the slot under the keyboard) . .
1100 Backup battery . . . . . . . . . . .
1110 PCI Express Mini Card for wireless LAN .
1120 Keyboard bezel assembly, FPC cable, and
Bluethooth daughter card . . . . . . . . .
1130 SmartCard . . . . . . . . . . . . .
1140 Modem daughter card (MDC). . . . . .
1150 Speaker assembly . . . . . . . . . .
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1160 LCD unit . . . . . . . . . . . . . . .
1170 Fan assembly . . . . . . . . . . . . .
1180 CPU . . . . . . . . . . . . . . . .
1190 Base cover assembly and DC-in connector
cable . . . . . . . . . . . . . . . . . .
1200 Magnesium structure frame . . . . . . .
1210 System board and ExpressCard slot
assembly . . . . . . . . . . . . . . . . .
1220 mSATA solid state drive . . . . . . . . .
2010 LCD bezel assembly . . . . . . . . . .
2020 LED board . . . . . . . . . . . . . .
2030 Integrated camera . . . . . . . . . . .
2040 LCD panel and LCD cable . . . . . . . .
2050 Camera cable . . . . . . . . . . . . .
2060 Wireless LAN antenna assembly or wireless
LAN/WAN antenna assembly . . . . . . . . .
2070 Hinges and LCD rear cover assembly . . .
Chapter 9. Locations . . . . . . . .
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Front view . . . . . . . . . . . . . . . .
Rear view. . . . . . . . . . . . . . . . .
Bottom view . . . . . . . . . . . . . . .
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Chapter 10. Parts list . . . . . . . .
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Overall . . . . . . . . . . . . .
LCD FRUs . . . . . . . . . . .
Keyboard . . . . . . . . . . . .
Miscellaneous parts . . . . . . .
Information about ac power adapters .
Power cords . . . . . . . . . .
Recovery discs . . . . . . . . .
Common service tools . . . . . .
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Appendix A. Notices . . . . . . . . .
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ThinkPad T420 and T420i Hardware Maintenance Manual
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Electronic emissions notices . . . . . . . . .
Trademarks . . . . . . . . . . . . . . . .
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About this manual
This manual contains service and reference information for the following ThinkPad® products.
ThinkPad T420 and T420i
Machine Type 4177, 4178, 4179, 4180, 4236, 4237, and 4238
Use this manual along with the advanced diagnostic tests to troubleshoot problems.
Important:
This manual is intended only for trained service technicians who are familiar with ThinkPad products. Use this
manual along with the advanced diagnostic tests to troubleshoot problems effectively.
Before servicing a ThinkPad product, be sure to read all the information under Chapter 1 “Safety information” on
page 1 and Chapter 2 “Important service information” on page 23.
© Copyright Lenovo 2011
iii
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
This chapter presents following safety information that you need to be familiar with before you service
a ThinkPad Notebook.
• “General safety” on page 1
• “Electrical safety” on page 2
• “Safety inspection guide” on page 3
• “Handling devices that are sensitive to electrostatic discharge” on page 3
• “Grounding requirements” on page 4
• “Safety notices (multilingual translations)” on page 5
• “Laser compliance statement (multilingual translations)” on page 17
General safety
Follow these rules to ensure general safety:
• Observe good housekeeping in the area of the machines during and after maintenance.
• When lifting any heavy object:
1. Make sure that you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the
muscles in your back. Do not attempt to lift any object that weighs more than 16 kg (35 lb) or that
you think is too heavy for you.
• Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe.
• Before you start the machine, make sure that other service technicians and the customer's personnel are
not in a hazardous position.
• Place removed covers and other parts in a safe place, away from all personnel, while you are servicing
the machine.
• Keep your toolcase away from walk areas so that other people will not trip over it.
• Do not wear loose clothing that can be trapped in the moving parts of a machine. Make sure that your
sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, about 8
centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Attention: Metal objects are good electrical conductors.
• Wear safety glasses when you are hammering, drilling, soldering, cutting wire, attaching springs, using
solvents, or working in any other conditions that might be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device
that is worn or defective.
• Reinstall all covers correctly before returning the machine to the customer.
• Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan
louvers or cover them with labels or stickers.
© Copyright Lenovo 2011
1
Electrical safety
Observe the following rules when working on electrical equipment.
Important:
Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does
not insulate you when working with live electrical currents.
Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease
electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.
• Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical
accident occurs, you can then operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
• Disconnect all power before:
– Performing a mechanical inspection
– Working near power supplies
– Removing or installing main units
• Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer
to power-off the wall box that supplies power to the machine, and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
– Ensure that another person, familiar with the power-off controls, is near you.
Attention: Another person must be there to switch off the power, if necessary.
– Use only one hand when working with powered-on electrical equipment; keep the other hand in your
pocket or behind your back.
Attention: An electrical shock can occur only when there is a complete circuit. By observing the above
rule, you may prevent a current from passing through your body.
– When using testers, set the controls correctly and use the approved probe leads and accessories for
that tester.
– Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as
metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages; Instructions for these
precautions are in the safety sections of maintenance information. Use extreme care when measuring
high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check that it has been powered off.
• Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors,
nongrounded power extension cables, power surges, and missing safety grounds.
• Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is
conductive; such touching can cause personal injury and machine damage.
• Do not service the following parts with the power on when they are removed from their normal operating
places in a machine:
– Power supply units
– Pumps
– Blowers and fans
– Motor generators
– Similar units to listed above
This practice ensures correct grounding of the units.
• If an electrical accident occurs:
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ThinkPad T420 and T420i Hardware Maintenance Manual
– Use caution; do not become a victim yourself.
– Switch off power.
– Send another person to get medical aid.
Safety inspection guide
The purpose of this inspection guide is to assist you in identifying potentially unsafe conditions. As each
machine was designed and built, required safety items were installed to protect users and service technicians
from injury. This guide addresses only those items. You should use good judgment to identify potential
safety hazards due to attachment of non-ThinkPad features or options not covered by this inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and
whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal
electrical shock)
• Explosive hazards, such as a damaged CRT face or a bulging capacitor
• Mechanical hazards, such as loose or missing hardware
To determine whether there are any potentially unsafe conditions, use the following checklist at the beginning
of every service task. Begin the checks with the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground
continuity for 0.1 ohm or less between the external ground pin and the frame ground.
b. The power cord should be the type specified in the parts list.
c. Insulation must not be frayed or worn.
4. Check for cracked or bulging batteries.
5. Remove the cover.
6. Check for any obvious non-ThinkPad alterations. Use good judgment as to the safety of any
non-ThinkPad alterations.
7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or
other liquids, or signs of fire or smoke damage.
8. Check for worn, frayed, or pinched cables.
9. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.
Handling devices that are sensitive to electrostatic discharge
Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to
electrostatic discharge(ESD). ESD damage can occur when there is a difference in charge between objects.
Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the
person handling the part are all at the same charge.
Chapter 1. Safety information
3
Notes:
1. Use product-specific ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective.
When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people.
• Wear a grounded wrist strap against your skin to eliminate static on your body.
• Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when
you are wearing a wrist strap.
• Use a grounded work mat to provide a static-free work surface. The mat is especially useful when
handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection that meets the specific
service requirement.
Note: The use of a grounding system to guard against ESD damage is desirable but not necessary.
– Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
– When working on a double-insulated or battery-operated system, use an ESD common ground or
reference point. You can use coax or connector-outside shells on these systems.
– Use the round ground prong of the ac plug on ac-operated computers.
Grounding requirements
Electrical grounding of the computer is required for operator safety and correct system function. Proper
grounding of the electrical outlet can be verified by a certified electrician.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Safety notices (multilingual translations)
The safety notices in this section are provided in the following languages:
• English
• Arabic
• Brazilian Portuguese
• French
• German
• Hebrew
• Japanese
• Korean
• Spanish
• Traditional Chinese
DANGER
Before the computer is powered on after FRU replacement, make sure all screws, springs, and other small
parts are in place and are not left loose inside the computer. Verify this by shaking the computer and listening
for rattling sounds. Metallic parts or metal flakes can cause electrical shorts.
DANGER
Some standby batteries contain a small amount of nickel and cadmium. Do not disassemble a standby battery,
recharge it, throw it into fire or water, or short-circuit it. Dispose of the battery as required by local ordinances
or regulations. Use only the battery in the appropriate parts listing. Use of an incorrect battery can result
in ignition or explosion of the battery.
DANGER
The battery pack contains small amounts of nickel. Do not disassemble it, throw it into fire or water, or
short-circuit it. Dispose of the battery pack as required by local ordinances or regulations. Use only the
battery in the appropriate parts listing when replacing the battery pack. Use of an incorrect battery can result
in ignition or explosion of the battery.
DANGER
The lithium battery can cause a fire, an explosion, or a severe burn. Do not recharge it, remove its polarized
connector, disassemble it, heat it above 100°C (212°F), incinerate it, or expose its cell contents to water.
Dispose of the battery as required by local ordinances or regulations. Use only the battery in the appropriate
parts listing. Use of an incorrect battery can result in ignition or explosion of the battery.
Chapter 1. Safety information
5
DANGER
If the LCD breaks and the fluid from inside the LCD gets into your eyes or on your hands, immediately wash
the affected areas with water for at least 15 minutes. Seek medical care if any symptoms from the fluid are
present after washing.
DANGER
To avoid shock, do not remove the plastic cover that protects the lower part of the inverter card.
DANGER
Though the main batteries have low voltage, a shorted or grounded battery can produce enough current to
burn personnel or combustible materials.
DANGER
Unless hot swap is allowed for the FRU being replaced, do as follows before removing it: power off the
computer, unplug all power cords from electrical outlets, remove the battery pack, and disconnect any
interconnecting cables.
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ThinkPad T420 and T420i Hardware Maintenance Manual
PERIGO
Chapter 1. Safety information
7
Antes de ligar o computador após a substituição da FRU, certifique-se de que todos os parafusos, molas e
outras peças pequenas estejam no lugar e não estejam soltos dentro do computador. Verifique isso sacudindo
o computador e procurando ouvir sons de peças soltas. Peças metálicas ou lascas de metal podem causar
curto-circuito.
PERIGO
Algumas baterias reserva contêm uma pequena quantidade de níquel e cádmio. Não desmonte uma bateria
reserva, recarregue-a, jogue-a no fogo ou na água, ou deixe-a entrar em curto-circuito. Descarte a bateria
conforme requerido pelas leis ou regulamentos locais. Use somente a bateria nas partes listadas apropriadas.
O uso de uma bateria incorreta pode resultar em combustão ou explosão da bateria.
PERIGO
O pacote da bateria contém uma pequena quantidade de níquel. Não o desmonte, jogue-o no fogo ou na
água, ou deixe-o entrar em curto-circuito. Descarte o pacote da bateria conforme requerido pelas leis ou
regulamentos locais. Use somente a bateria nas partes listadas apropriadas ao substituir o pacote da bateria.
O uso de uma bateria incorreta pode resultar em combustão ou explosão da bateria.
PERIGO
A bateria de lítio pode causar incêndio, explosão ou graves queimaduras. Não a recarregue, remova seu
conector polarizado, desmonte-a, aqueça-a acima de 100°C (212°F), incinere-a, ou exponha o conteúdo de
sua célula à água. Descarte a bateria conforme requerido pelas leis ou regulamentos locais. Use somente
a bateria nas partes listadas apropriadas. O uso de uma bateria incorreta pode resultar em combustão
ou explosão da bateria.
PERIGO
Se o LCD quebrar e o fluido de dentro dele entrar em contato com seus olhos ou com suas mãos, lave as
áreas afetadas imediatamente com água durante pelo menos 15 minutos. Procure cuidados médicos se algum
sintoma causado pelo fluido surgir após a lavagem.
PERIGO
Para evitar choque elétrico, não remova a capa plástica que protege a parte inferior da placa inversora.
PERIGO
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ThinkPad T420 and T420i Hardware Maintenance Manual
Embora as principais baterias possuam baixa voltagem, uma bateria em curto-circuito ou aterrada pode
produzir corrente o bastante para queimar materiais de pessoal ou inflamáveis.
PERIGO
A menos que uma hot swap seja permitida para a FRU que está sendo substituída, faça o seguinte antes de
removê-la: desligue o computador, desconecte todos os cabos de energia das tomadas, remova o pacote de
baterias e desconecte quaisquer cabos de interconexão.
DANGER
Avant de remettre l'ordinateur sous tension après remplacement d'une unité en clientèle, vérifiez que tous les
ressorts, vis et autres pièces sont bien en place et bien fixées. Pour ce faire, secouez l'unité et assurez-vous
qu'aucun bruit suspect ne se produit. Des pièces métalliques ou des copeaux de métal pourraient causer
un court-circuit.
DANGER
Certaines batteries de secours contiennent du nickel et du cadmium. Ne les démontez pas, ne les rechargez
pas, ne les exposez ni au feu ni à l'eau. Ne les mettez pas en court-circuit. Pour les mettre au rebut,
conformez-vous à la réglementation en vigueur. Lorsque vous remplacez la pile de sauvegarde ou celle de
l'horloge temps réel, veillez à n'utiliser que les modèles cités dans la liste de pièces détachées adéquate. Une
batterie ou une pile inappropriée risque de prendre feu ou d'exploser.
DANGER
La batterie contient du nickel. Ne la démontez pas, ne l'exposez ni au feu ni à l'eau. Ne la mettez pas en
court-circuit. Pour la mettre au rebut, conformez-vous à la réglementation en vigueur. Lorsque vous remplacez
la batterie, veillez à n'utiliser que les modèles cités dans la liste de pièces détachées adéquate. En effet, une
batterie inappropriée risque de prendre feu ou d'exploser.
DANGER
La pile de sauvegarde contient du lithium. Elle présente des risques d'incendie, d'explosion ou de brûlures
graves. Ne la rechargez pas, ne retirez pas son connecteur polarisé et ne la démontez pas. Ne l'exposez pas à
une temperature supérieure à 100°C, ne la faites pas brûler et n'en exposez pas le contenu à l'eau. Mettez la
pile au rebut conformément à la réglementation en vigueur. Une pile inappropriée risque de prendre feu ou
d'exploser.
Chapter 1. Safety information
9
DANGER
Si le panneau d'affichage à cristaux liquides se brise et que vous recevez dans les yeux ou sur les mains une
partie du fluide, rincez-les abondamment pendant au moins quinze minutes. Consultez un médecin si des
symptômes persistent après le lavage.
DANGER
Afin d'éviter tout risque de choc électrique, ne retirez pas le cache en plastique protégeant la partie inférieure
de la carte d'alimentation.
DANGER
Bien que le voltage des batteries principales soit peu élevé, le court-circuit ou la mise à la masse d'une
batterie peut produire suffisamment de courant pour brûler des matériaux combustibles ou causer des
brûlures corporelles graves.
DANGER
Si le remplacement à chaud n'est pas autorisé pour l'unité remplaçable sur site que vous remplacez,
procédez comme suit avant de retirer l'unité : mettez l'ordinateur hors tension, débranchez tous les
cordons d'alimentation des prises de courant, retirez le bloc de batterie et déconnectez tous les câbles
d'interconnexion.
VORSICHT
Bevor nach einem FRU-Austausch der Computer wieder angeschlossen wird, muß sichergestellt werden, daß
keine Schrauben, Federn oder andere Kleinteile fehlen oder im Gehäuse vergessen wurden. Der Computer muß
geschüttelt und auf Klappergeräusche geprüft werden. Metallteile oder-splitter können Kurzschlüsse erzeugen.
VORSICHT
Die Bereitschaftsbatterie, die sich unter dem Diskettenlaufwerk befindet, kann geringe Mengen Nickel
und Cadmium enthalten. Sie darf nur durch die Verkaufsstelle oder den IBM Kundendienst ausgetauscht
werden. Sie darf nicht zerlegt, wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt
werden. Die Batterie kann schwere Verbrennungen oder Verätzungen verursachen. Bei der Entsorgung die
örtlichen Bestimmungen für Sondermüll beachten. Beim Ersetzen der Bereitschafts-oder Systembatterie nur
Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann
zu Entzündung oder Explosion führen.
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ThinkPad T420 and T420i Hardware Maintenance Manual
VORSICHT
Akkus enthalten geringe Mengen von Nickel. Sie dürfen nicht zerlegt, wiederaufgeladen, kurzgeschlossen,
oder Feuer oder Wasser ausgesetzt werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll
beachten. Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt
ist. Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.
VORSICHT
Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden, explodieren oder schwere Verbrennungen
hervorrufen. Batterien dieses Typs dürfen nicht aufgeladen, zerlegt, über 100°C erhitzt oder verbrannt werden.
Auch darf ihr Inhalt nicht mit Wasser in Verbindung gebracht oder der zur richtigen Polung angebrachte
Verbindungsstecker entfernt werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll
beachten. Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt
ist. Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.
VORSICHT
Die Leuchtstoffröhre im LCD-Bildschirm enthält Quecksilber. Bei der Entsorgung die örtlichen Bestimmungen
für Sondermüll beachten. Der LCD-Bildschirm besteht aus Glas und kann zerbrechen, wenn er unsachgemäß
behandelt wird oder der Computer auf den Boden fällt. Wenn der Bildschirm beschädigt ist und die darin
befindliche Flüssigkeit in Kontakt mit Haut und Augen gerät, sollten die betroffenen Stellen mindestens 15
Minuten mit Wasser abgespült und bei Beschwerden anschließend ein Arzt aufgesucht werden.
VORSICHT
Aus Sicherheitsgründen die Kunststoffabdeckung, die den unteren Teil der Spannungswandlerplatine umgibt,
nicht entfernen.
VORSICHT
Obwohl Hauptbatterien eine niedrige Spannung haben, können sie doch bei Kurzschluß oder Erdung genug
Strom abgeben, um brennbare Materialien zu entzünden oder Verletzungen bei Personen hervorzurufen.
VORSICHT
Chapter 1. Safety information
11
Wenn ein Austausch der FRU bei laufendem Betrieb nicht erlaubt ist, gehen Sie beim Austausch der FRU wie
folgt vor: Schalten Sie den Computer aus, ziehen Sie alle Netzkabel von den Netzsteckdosen ab, entfernen
Sie den Akku und ziehen Sie alle miteinander verbundenen Kabel ab.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
13
14
ThinkPad T420 and T420i Hardware Maintenance Manual
Antes de encender el sistema despues de sustituir una FRU, compruebe que todos los tornillos, muelles y
demás piezas pequeñas se encuentran en su sitio y no se encuentran sueltas dentro del sistema. Compruébelo
agitando el sistema y escuchando los posibles ruidos que provocarían. Las piezas metálicas pueden causar
cortocircuitos eléctricos.
Algunas baterías de reserva contienen una pequeña cantidad de níquel y cadmio. No las desmonte, ni
recargue, ni las eche al fuego o al agua ni las cortocircuite. Deséchelas tal como dispone la normativa local.
Utilice sólo baterías que se encuentren en la lista de piezas. La utilización de una batería no apropiada
puede provocar la ignición o explosión de la misma.
Las baterías contienen pequeñas cantidades de níquel. No las desmonte, ni recargue, ni las eche al fuego
o al agua ni las cortocircuite. Deséchelas tal como dispone la normativa local. Utilice sólo baterías que se
encuentren en la lista de piezas al sustituir la batería. La utilización de una batería no apropiada puede
provocar la ignición o explosión de la misma.
La batería de repuesto es una batería de litio y puede provocar incendios, explosiones o quemaduras graves.
No la recargue, ni quite el conector polarizado, ni la desmonte, ni caliente por encima de los 100°C (212°F), ni
la incinere ni exponga el contenido de sus celdas al agua. Deséchela tal como dispone la normativa local.
Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos o sus manos, lave inmediatamente
las áreas afectadas con agua durante 15 minutos como mínimo. Obtenga atención medica si se presenta
algún síntoma del fluido despues de lavarse.
Chapter 1. Safety information
15
Para evitar descargas, no quite la cubierta de plástico que rodea la parte baja de la tarjeta invertida.
Aunque las baterías principales tienen un voltaje bajo, una batería cortocircuitada o con contacto a tierra
puede producir la corriente suficiente como para quemar material combustible o provocar quemaduras en
el personal.
Salvo que se permita el intercambio en caliente para la unidad sustituible localmente, realice lo siguiente antes
de extraerla: apague el sistema, desconecte todos los cables de alimentación de las tomas de alimentación
eléctrica, extraiga la batería y desconecte los cables de interconexión.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Laser compliance statement (multilingual translations)
The laser compliance statements in this section are provided in the following languages:
• English
• Arabic
• Brazilian Portuguese
• French
• German
• Hebrew
• Japanese
• Korean
• Spanish
• Traditional Chinese
Chapter 1. Safety information
17
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
19
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 1. Safety information
21
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 2. Important service information
This chapter presents following important service information that applies to all machine types supported by
this manual:
• “Strategy for replacing FRUs” on page 23
– “Strategy for replacing a hard disk drive” on page 23
– “Important notice for replacing a system board” on page 24
– “How to use error message” on page 24
• “Strategy for replacing FRUs for CTO, CMV, and GAV” on page 25
– “Product definition” on page 25
– “FRU identification for CTO, CMV, and GAV products” on page 25
Important:
Advise customers to contact the Lenovo Customer Support Center if they need any assistance in obtaining or
installing any software fixes, drivers, and UEFI BIOS downloads. Telephone numbers forLenovo Support are
available at http://www.lenovo.com/support.
System Disassembly/Reassembly videos that show the FRU removals or replacements for the Lenovo® authorized
service technicians are available in the following support site:
http://www.lenovoservicetraining.com/ion/
Strategy for replacing FRUs
Before replacing parts:
Make sure that all software fixes, drivers, and UEFI BIOS downloads are installed before replacing any
FRUs listed in this manual.
After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before
completing the service action.
To download software fixes, drivers, and UEFI BIOS, go to http://www.lenovo.com/support and click
Download Drivers & Software. Then follow the instructions on the screen to install the necessary software.
Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs:
• If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall
the original FRU before you continue.
• Some computers have both a processor board and a system board. If you are instructed to replace either
the processor board or the system board, and replacing one of them does not correct the problem,
reinstall that board, and then replace the other one.
• If an adapter or a device consists of more than one FRU, any of the FRUs may be the cause of the error.
Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change.
Replace only the FRU that changed the symptoms.
Attention: The setup configuration on the computer you are servicing may have been customized. Running
Automatic Configuration may alter the settings. Note the current configuration settings (using the View
Configuration option); then, when service has been completed, verify that those settings remain in effect.
Strategy for replacing a hard disk drive
Always try to run a low-level format before replacing a hard disk drive. This will cause all customer data on
the hard disk to be lost. Be sure that the customer has a current backup of the data before doing this task.
© Copyright Lenovo 2011
23
Attention: The drive startup sequence in the computer you are servicing may have been changed. Be
extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect
drive, data or programs can be overwritten.
If your computer is shipped with an mSATA drive and a solid state drive or hard disk drive, the mSATA drive
will be seen as hard disk 0 in the system, and assigned drive C:. The solid state drive or hard disk drive will
be seen as hard disk 1, and assigned drive D:. The mSATA drive is installed in the wireless WAN card slot of
the computer. The Lenovo preloaded software is installed on the mSATA drive.
Always try to run a low-level format before replacing a hard disk drive. This will cause all customer data on
the hard disk to be lost. Be sure that the customer has a current backup of the data before doing this task.
Attention: The drive startup sequence in the computer you are servicing may have been changed. Be
extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect
drive, data or programs can be overwritten.
Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper handling of a system board can
cause damage to those components, and may cause a system malfunction.
Attention: When handling a system board:
• Do not drop a system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array) chipset.
How to use error message
Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed,
begin the diagnosis with the first error code. Whatever causes the first error code may also cause false error
codes. If no error code is displayed, see whether the error symptom is listed in the Symptom-to-FRU
Index for the computer you are servicing.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Strategy for replacing FRUs for CTO, CMV, and GAV
Product definition
Dynamic Configure To Order (CTO)
This provides the ability for a customer to configure a Lenovo solution from an eSite, and have this
configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label,
Product Entitlement Warehouse (PEW), eSupport, and the HMM will load these products as the 4-digit MT
and 3-digit model, where model = “CTO” (Example: 1829-CTO).
Custom Model Variant (CMV)
This is a unique configuration that has been negotiated between Lenovo and the customer. A unique 4-digit
MT and 3-digit model is provided to the customer to place orders (Example: 1829-W15). A CMV is a special
bid offering. Therefore, it is NOT generally announced.
• The MTM portion of the machine label is the 4-digit MT and 3-digit model, where model = “CTO”
(Example: 1829-CTO). The PRODUCT ID portion of the machine label is the 4-digit MT and 3-digit CMV
model (Example: 1829-W15).
• The PEW record is the 4-digit MT and 3-digit model, where model = “CTO” (Example: 1829-CTO).
• eSupport will show both the CTO and CMV machine type models (Example: 1829-CTO and 1829-W15
will be found on the eSupport site.)
• The HMM will have the 4-digit MT and 3-digit CTO model only (Example: 1829-CTO). Again, CMVs are
custom models and are not found in the HMM.
General Announce Variant (GAV)
This is a standard model (fixed configuration). GAVs are announced and offered to all customers. The MTM
portion of the machine label is a 4-digit MT and 3-digit model, where model = a “fixed part number”, not
“CTO” (Example: 1829-F1U). Also, PEW, eSupport, and the HMM will list these products under the same
fixed model number.
FRU identification for CTO, CMV, and GAV products
There are three information resources to identify which FRUs are used to support CTO, CMV, and GAV
products. These sources are PEW, eSupport, and the HMM.
Using PEW
• PEW is the primary source for identifying FRU part numbers and FRU descriptions for the key commodities
for CTO, CMV and GAV products at a MT - serial number level. An example of key commodities are hard
disk drives, system boards, microprocessors, Liquid Crystal Displays (LCDs), and memory.
• Remember, all CTO and CMV products are loaded in PEW under the 4-digit MT and 3-digit model, where
model = “CTO” (Example: 1829-CTO). GAVs are loaded in PEW under the 4-digit MT and 3-digit model,
where model = a “fixed part number”, not “CTO” (Example: 1829-F1U).
• PEW can be accessed at the following Web site:
http://www.lenovo.com/support/site.wss/document.do?lndocid=LOOK-WARNTY
Select Warranty lookup. Input the MT and the Serial number and the list of key commodities will be
returned in the PEW record under COMPONENT INFORMATION.
Using eSupport
For Key Commodities (Examples - hard disk drive, system board, microprocessor, LCD, and memory)
Chapter 2. Important service information
25
• eSupport can be used to view the list of key commodities built in a particular machine serial (this is the
same record found in PEW).
• eSupport can be accessed at the following Web site:
http://www.lenovo.com/support
• To view the key commodities, do the following:
1. Click Products & Service Warranty.
2. Click Check Warranty Status.
3. On the Warranty Status Lookup page, click Parts Lookup.
4. Type your machine type and serial number, and then click Submit. The key commodities will be
displayed.
For the Remaining FRUs (the complete list of FRUs at the MT Model level)
• eSupport can be used to view the complete list of FRUs for a machine type and model.
• To view the complete list of FRUs, do the following:
1. Click Product & Parts Detail and then follow the instructions on the screen to reach the Product
and Parts Details page.
2. Click the Parts Detail tab to view the list of service parts.
Using the HMM
For Key Commodities (Examples - hard disk drive, system board, microprocessor, LCD, and memory)
Use the HMM as a back-up to PEW and eSupport to view the complete list of FRUs at the MT Model level.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 3. General checkout
This chapter presents following information:
• “What to do first” on page 28
• “Checkout guide” on page 29
– “Diagnostics using PC-Doctor for DOS” on page 29
– “Lenovo ThinkVantage Toolbox” on page 31
– “FRU tests” on page 33
• “Power system checkout” on page 34
The descriptions in this chapter apply to any ThinkPad model that supports the PC-Doctor® for DOS
diagnostics program. Some descriptions might not apply to your particular computer.
Before you go to the checkout guide, be sure to read the following important notes.
Important notes:
• Only certified trained personnel should service the computer.
• Before replacing any FRU, read the entire page on removing and replacing FRUs.
• When you replace FRUs, use new nylon-coated screws.
• Be extremely careful during such write operations as copying, saving, or formatting. Drives in the computer
that you are servicing sequence might have been altered. If you select an incorrect drive, data or programs
might be overwritten.
• Replace a FRU only with another FRU of the correct model. When you replace a FRU, make sure that the model
of the machine and the FRU part number are correct by referring to the FRU parts list.
• A FRU should not be replaced because of a single, unreproducible failure. Single failures can occur for a
variety of reasons that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge,
or software errors. Consider replacing a FRU only when a problem recurs. If you suspect that a FRU is defective,
clear the error log and run the test again. If the error does not recur, do not replace the FRU.
• Be careful not to replace a nondefective FRU.
© Copyright Lenovo 2011
27
What to do first
When you do return a FRU, you must include the following information in the parts exchange form or
parts return form that you attach to it:
1. Name and phone number of service technician
2. Date of service
3. Date on which the machine failed
4. Date of purchase
5. Failure symptoms, error codes appearing on the display, and beep symptoms
6. Procedure index and page number in which the failing FRU was detected
7. Failing FRU name and part number
8. Machine type, model number, and serial number
9. Customer's name and address
Note: During the warranty period, the customer may be responsible for repair costs if the computer damage
was caused by misuse, accident, modification, unsuitable physical or operating environment, or improper
maintenance by the customer. Following is a list of some common items that are not covered under warranty
and some symptoms that might indicate that the system was subjected to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is covered under the warranty
by referring to the following list:
The following are not covered under warranty:
• LCD panel cracked from the application of excessive force or from being dropped
• Scratched (cosmetic) parts
• Distortion, deformation, or discoloration of the cosmetic parts
• Plastic parts, latches, pins, or connectors that have been cracked or broken by excessive force
• Damage caused by liquid spilled into the system
• Damage caused by the improper insertion of a PC Card or the installation of an incompatible card
• Improper disc insertion or use of an optical drive
• Diskette drive damage caused by pressure on the diskette drive cover, foreign material in the drive,
or the insertion of a diskette with multiple labels
• Damaged or bent diskette eject button
• Fuses blown by attachment of a nonsupported device
• Forgotten computer password (making the computer unusable)
• Sticky keys caused by spilling a liquid onto the keyboard
• Use of an incorrect ac power adapter on laptop products
The following symptoms might indicate damage caused by nonwarranted activities:
• Missing parts might be a symptom of unauthorized service or modification.
• If the spindle of a hard disk drive becomes noisy, it may have been subjected to excessive force,
or dropped.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Checkout guide
Use the following procedures as a guide in identifying and correcting problems with the ThinkPad Notebook.
Note: The diagnostic tests are intended to test only ThinkPad products. The use of non-ThinkPad products,
prototype cards, or modified options can lead to false indications of errors and invalid system responses.
1. Identify the failing symptoms in as much detail as possible.
2. Verify the symptoms. Try to re-create the failure by running the diagnostic test or by repeating the
operation.
Diagnostics using PC-Doctor for DOS
The ThinkPad Notebook has a test program called PC-Doctor for DOS (hereafter called PC-Doctor.) You can
detect errors by running the diagnostics test included in PC-Doctor.
Note: PC-Doctor for DOS is available at the following Web site:
http://www.lenovo.com/support
To create the PC-Doctor diagnostic CD, follow the instructions on the Web site.
For some possible configurations of the computer, PC-Doctor might not run correctly. To avoid this problem,
you need to initialize the computer setup by use of the ThinkPad Setup program before you run PC-Doctor.
To enter the ThinkPad Setup program, do as follows:
1. Turn on the computer.
2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program.
Note: If a supervisor password has been set by the customer, the ThinkPad Setup program menu appears
after the password is entered. You can start the ThinkPad Setup program by pressing Enter instead of
entering the supervisor password; however, you cannot change the parameters that are protected by the
supervisor password.
On the ThinkPad Setup program screen, press F9, Enter, F10, and then Enter.
Note: When you initialize the computer configuration, some devices are disabled, such as the serial port. If
you test one of these devices, you will need to enable it by using Configuration utility for DOS. The utility is
available on the following Web site:
http://www.lenovo.com/support
PC-Doctor cannot be used to test a device that is in the docking station, even if the computer supports the
docking station. To test a USB device, connect it to the USB connector of the computer.
Testing the computer
Note: The PC-Doctor for DOS CD-R/CD-RW disc supports only test of internal optical disc drives (CD-RW,
CD-RW/DVD Combo, and DVD Multi drives) on ThinkPad computers. It does not support test of any optical
disc drives connected through USB devices, PC cards, CardBus cards, or similar. The USB limitation only
applies to testing of the device. Using a bootable PC-Doctor for DOS CD/DVD, the system can be started
from a USB attached optical drive.
To run the test, do as follows:
1. Turn off the computer.
2. Make sure that the optical drive that is supported as a startup device is installed to the computer.
Chapter 3. General checkout
29
3. Turn on the computer. If the computer cannot be powered on, go to “Power system checkout” on
page 34, and check the power sources.
If an error code appears, go to “Symptom-to-FRU index” on page 43.
4. When the ThinkPad logo comes up, immediately press F12 to enter the Boot Menu.
5. Insert the PC-Doctor CD into the optical drive.
6. Press cursor keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter.
7. Follow the instructions on the screen.
8. The main panel of PC-Doctor appears.
9. Select Diagnostics with the arrow keys, and press Enter.
Note: You can select an item not only with the arrow keys, but also with the TrackPoint® pointer.
Instead of pressing Enter, click the left button.
A pull-down menu appears. (Its exact form depends on the model.)
Note: PC-Doctor menu does not mean the formal support device list. Some unsupported device names
may appear in the PC-Doctor menu.
Diagnostics
Interactive Tests
Hardware Info
Utility
Quit
F1=Help
Run Normal Test
Run Quick Test
CPU/Coprocessor
System Memory
Systemboard
Video Adapter
Fixed Disks
Diskette Drives
Other Devices
Communication
Wireless LAN
PC-DOCTOR 2.0 Copyright 2008 PC-Doctor, Inc. All Rights Reserved.
Use the cursor keys and ESC to move in menus. Press ENTER to select.
The options on the test menu are as follows:
Diagnostics
Interactive Tests
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Run Normal Test
Run Quick Test
CPU/Coprocessor
System Memory
Systemboard
Video Adapter
Fixed Disks
Diskette Drives
Other Devices
Communication
Wireless LAN
Keyboard
Video
Internal Speaker
Mouse
Diskette
System Load
Optical Drive Test
Intel WLAN Radio Test
Notes:
• In the Keyboard test in Interactive Tests, the Fn key should be held down for at least 2 seconds; otherwise, it
cannot be sensed.
• Video Adapter test supports only the LCD display on the ThinkPad Notebook. If you have an external monitor
attached to your computer, detach it before running PC-Doctor for DOS.
• To test Digital Signature Chip, the security chip must be set to Active.
10. Run the applicable function test.
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ThinkPad T420 and T420i Hardware Maintenance Manual
11. Follow the instructions on the screen. If there is a problem, PC-Doctor shows messages describing it.
12. To exit the test, select Quit — Exit Diag. To cancel the test, press Esc.
Note: After running PC-Doctor, check the time and date on the system and reset them if they are incorrect.
Detecting system information with PC-Doctor
PC-Doctor can detect the following system information:
Hardware Info
•
•
•
•
•
•
•
•
•
•
System Configuration
Memory Contents
Physical Disk Drives
VGA Information
ATA Drive Info
PCI Information
PNPISA Info
SMBIOS Info
VESA LCD Info
Hardware Events Log
•
•
•
•
•
•
•
Run External Tests
Benchmark System
DOS Shell
Tech Support Form
Battery Rundown
Erase Drive Contents
View PCDR Host Log
Utility
Lenovo ThinkVantage Toolbox
Lenovo ThinkVantage® Toolbox is a diagnostic program that works through the Windows operating system.
It enables you to view symptoms of computer problems and solutions for them, and includes automatic
notification when action is required, computing assistance, advanced diagnostics, and diagnostic history.
Notes:
• The latest Lenovo ThinkVantage Toolbox is available at the following Web site:
http://web.lenovothinkvantagetoolbox.com/
• To install the latest Lenovo ThinkVantage Toolbox on the computer, click Download Lenovo ThinkVantage
Toolbox, and then follow the instructions on the Web site.
To run this program, do as follows:
Windows 7:
While the Windows operating system is running, press the ThinkVantage button.
To start this program, do the following:
• Click Start ➙ Control Panel ➙ System and Security ➙ Lenovo – System Health and Diagnostics.
Windows VistaR and Windows XP:
Click Start ➙ All Programs ➙ ThinkVantage ➙ Lenovo ThinkVantage Toolbox
Follow the instructions on the screen. Lenovo ThinkVantageToolbox also has problem determination aids
that determine software and usage problems.
Chapter 3. General checkout
31
For additional information about this program, see the Help for the program.
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ThinkPad T420 and T420i Hardware Maintenance Manual
FRU tests
The following table shows the test for each FRU.
Table 1. FRU tests
FRU
Systemboard
Applicable test
1. Diagnostics ➙ CPU/Coprocessor
2. Diagnostics ➙ Systemboard
3. If the docking station or the port replicator is attached to the ThinkPad Notebook,
detach it.
4. Place the computer on a horizontal surface, and run Diagnostics ➙ ThinkPad
Devices ➙ HDD Active Protection Test.
Note: Do not apply any physical shock to the computer while the test is running.
Power
LCD unit
Diagnostics ➙ ThinkPad Devices ➙ ac power adapter, Battery 1 (Battery2)
1. Diagnostics ➙ Video Adapter
2. Interactive Tests ➙ Video
Audio
Enter the ThinkPad Setup program and change Serial ATA (SATA) setting to
Compatibility, and run Diagnostics ➙ Other Device ➙ Conexant Audio.
Speaker
Interactive Tests ➙ Internal Speaker
Note: Once Audio test is done, the no sound is heard this test. In this case, turn off
and turn on the computer. Then, run this test again.
Keyboard
Hard disk drive or solid state
drive
1. Diagnostics ➙ Systemboard ➙ Keyboard
2. Interactive Tests ➙ Keyboard
Enter the ThinkPad Setup program and change Serial ATA (SATA) setting to
Compatibility, and run Diagnostics ➙ Fixed Disks.
Diskette drive
1. Diagnostics ➙ Diskette Drives
2. Interactive Tests ➙ Diskette
Optical drive
1. Diagnostics ➙ Other Devices ➙ Optical Drive
2. Interactive Tests ➙ Optical Drive Test
Memory
1. If two DIMMs are installed, remove one of them and run Diagnostics ➙ System
Memory.
2. If the problem does not recur, return the DIMM to its place, remove the other one,
and run the test again.
TrackPoint or pointing
device
If the TrackPoint does not work, check the configuration as specified in the ThinkPad
Setup program. If the TrackPoint is disabled, select Automatic to enable it.
After you use the TrackPoint, the pointer may drift on the screen for a short time. This
drift can occur when a slight, steady pressure is applied to the TrackPoint pointer.
This symptom is not a hardware problem. If the pointer stops after a short time, no
service action is necessary.
If enabling theTrackPoint does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse
Touch Pad
If the Touch Pad does not work, check the configuration as specified in the ThinkPad
Setup program. If the Touch Pad is disabled, select Automatic to enable it. If enabling
the Touch Pad does not correct the problem, continue with the following:
• Interactive Tests ➙ Mouse
Chapter 3. General checkout
33
Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac power adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac power adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
• “Checking the ac power adapter” on page 34
• “Checking operational charging” on page 34
• “Checking the battery pack” on page 35
• “Checking the backup battery” on page 35
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
• If the power problem occurs only when the docking station or the port replicator is used, replace the
docking station or the port replicator.
• If the power-on indicator does not turn on, check the power cord of the ac power adapter for correct
continuity and installation.
• If the computer does not charge during operation, go to “Checking operational charging” on page 34.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following figure:
3
2
1
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
(20V)
Note: Output voltage of pin no.2 of the ac power adapter may different from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, do the following:
• Replace the system board.
• If the problem persists, go to “FRU tests” on page 33.
Note: Noise from the ac power adapter does not always indicate a defect.
Checking operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery
pack that has less than 50% of the total power remaining when installed in the computer.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery
pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does
not turn on, replace the battery pack.
If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is
still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% of the
total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects
the battery pack from being overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Manager Battery Gauge icon in the icon tray of the
Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining
is displayed. To get detailed information about the battery, double-click the Power Manager Battery
Gauge icon.
Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave
it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the
following figure:
1(+)
2(+)
5
3 4
6(-)
Terminal
Voltage (V dc)
1
+ 0 to + 16.8
7
Ground (-)
7(-)
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note: Recharging will take at least 3 hours, even if the indicator does not turn on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7.
The resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the battery pack. If the
resistance is correct, replace the system board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac power adapter from it.
2. Turn the computer upside down.
3. Remove the battery pack (see “1010 Battery pack” on page 63).
4. Remove the backup battery (see “1100 Backup battery” on page 79).
5. Measure the voltage of the backup battery. See the following figure.
Chapter 3. General checkout
35
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 4. Related service information
This chapter presents following information:
• “Restoring the factory contents by using Recovery Disc Set” on page 37
• “Passwords” on page 38
• “Power management” on page 41
• “Symptom-to-FRU index” on page 43
Service Web site:
When the latest maintenance diskette and the system program service diskette become available, they will be posted
on
http://www.lenovo.com/support
Restoring the factory contents by using Recovery Disc Set
When the hard disk drive (HDD) or solid state drive (SSD) is replaced because of a failure, no product recovery
program is on the new drive. In this case, you must use the Recovery Disc Set for the computer. Order the
Recovery Disc Set and the drive at the same time so that you can recover the new drive with the pre-installed
software when they arrive. For information on which discs to order, see “Recovery discs” on page 160.
The recovery disc set consists of the user instructions and the following set of DVDs to restore the computer
to the original factory configuration.
Operating System Recovery Disc (one disc)
This disc restores the Microsoft® Windows operating
system. Use this disc to start the recovery process.
Applications and Drivers Recovery Disc (one or
more discs)
This disc restores the preinstalled applications and
drivers on the computer.
Supplemental Recovery Disc
This disc contains additional content, such as
updates to the software that was preinstalled on the
computer. Not all recovery disc sets come with a
Supplemental Recovery Disc.
Notes:
• You must have a DVD drive to use the recovery discs. If you do not have an internal DVD drive, you
can use an external USB DVD drive.
• During the recovery process, all data on the drive will be deleted. If possible, copy any important data
or personal files that you want to keep onto removable media or a network drive before you start the
recovery process.
To restore the computer to the original factory configuration using the recovery disc set, do the following:
Note: Recovery can take one to two hours to complete. The length of time depends on the method you use. If you
use recovery discs, the recovery process will take about two hours.
1. Make the CD/DVD drive the first startup device in the startup sequence using the following procedure:
a. Press and hold down the F1 key, and then turn on the computer. When the logo screen is displayed
or if you hear repeating beeps, release the F1 key. The ThinkPad Setup program opens.
b. Use the arrow keys to select Startup ➙ Boot.
c. Select the CD/DVD drive as the 1st Boot Device.
© Copyright Lenovo 2011
37
2. Insert the Operating System Recovery Disc into the DVD drive.
3. Press F10 to save the ThinkPad Setup program configuration changes. Follow the instructions on the
screen to begin the recovery process.
4. Select your language and click Next.
5. Read the license. If you agree with the terms and conditions, select I accept these terms and
conditions and then click Next. If you do not agree with the terms and conditions, follow the
instructions on the screen.
6. Click Yes in the displayed window to begin the operating system recovery process.
7. Insert the Applications and Drivers Recovery Disc when prompted and then click OK to begin the
applications and drivers recovery process.
8. If you have a Supplemental Recovery Disc, insert it when prompted and click Yes. If you do not have a
Supplemental Recovery Disc, click No.
9. When all of the data has been copied from the last disc in the set and has been processed, remove the
disc and restart the computer.
Note: The rest of the recovery process is fully automated and no action is required by you. The
computer will restart into the Microsoft Windows desktop several times and you might experience
periods when no activity is apparent on the screen for several minutes at a time. This is normal.
10. When the recovery process is complete, the Set Up Windows screen is displayed. Follow the
instructions on the screen to complete the Windows setup.
11. After you have completed the Windows setup, you might want to restore the original startup sequence.
Start the ThinkPad Setup program and then press F9 to restore the default settings. Press F10 to save
and exit the ThinkPad Setup program.
Note: After restoring a drive to the factory default settings, you might need to reinstall some device drivers.
Passwords
As many as three passwords may be needed for any ThinkPad Notebook: the power-on password (POP),
the hard-disk password (HDP), and the supervisor password (SVP).
If any of these passwords has been set, a prompt for it appears on the screen whenever the computer is
turned on. The computer does not start until the password is entered.
Note: If only an SVP is installed, the password prompt does not appear when the operating system is booted.
Power-on password
A power-on password (POP) protects the system from being powered on by an unauthorized person. The
password must be entered before an operating system can be booted. For how to remove the POP, see
“How to remove the power-on password” on page 39.
Hard-disk password
There are two hard-disk passwords (HDPs):
• User HDP—for the user
• Master HDP—for the system administrator, who can use it to get access to the hard disk even if the user
has changed the user HDP
Note: There are two modes for the HDP: User only and Master + User. The Master + User mode requires
two HDPs; the system administrator enters both in the same operation. The system administrator then
provides the user HDP to the system user.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Attention: If the user HDP has been forgotten, check whether a master HDP has been set. If it has, it can be
used for access to the hard disk drive. If no master HDP is available, neither Lenovo nor Lenovo authorized
service technicians provide any services to reset either the user or the master HDP, or to recover data from
the hard disk drive. The hard disk drive can be replaced for a scheduled fee.
For how to remove the POP, see “How to remove the hard-disk password” on page 39.
Supervisor password
A supervisor password (SVP) protects the system information stored in the ThinkPad Setup program.
The user must enter the SVP in order to get access to the ThinkPad Setup program and change the
system configuration.
Attention: If the SVP has been forgotten and cannot be made available to the service technician, there is no
service procedure to reset the password. The system board must be replaced for a scheduled fee.
How to remove the power-on password
To remove a POP that you have forgotten, do the following:
(A) If no SVP has been set:
1. Turn off the computer.
2. Remove the battery pack. For how to remove the battery pack, see “1010 Battery pack” on page 63.
3. Remove the backup battery. For how to remove the backup battery, see “1100 Backup battery” on
page 79.
4. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does
not appear. The POP has been removed.
5. Reinstall the backup battery and the battery pack.
(B) If an SVP has been set and is known by the service technician:
1. Turn on the computer.
2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program. When
the POP icon is appearing on the screen, enter the POP.
3. Select Security, using the cursor directional keys to move the menu.
4. Select Password.
5. Select Power-On Password.
6. Type the current SVP in the Enter Current Password field. then leave the Enter New Password field
blank, and press Enter twice.
7. In the Changes have been saved window, press Enter.
8. Press F10; then, in the Setup confirmation window, select Yes.
How to remove the hard-disk password
Attention: If User only mode is selected and the user HDP has been forgotten and cannot be made
available to the service technician, neither Lenovo nor Lenovo authorized service technicians provide any
services to reset the user HDPs or to recover data from the hard disk drive. The hard disk drive can be
replaced for a scheduled fee.
To remove a user HDP that has been forgotten, when the SVP and the master HDP are known, do the
following:
1. Turn on the computer.
Chapter 4. Related service information
39
2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program. When
the POP icon is appearing on the screen, enter the POP.
3. Select Security, using the cursor directional keys to move the menu.
4. Select Password.
5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
6. Select Master HDP.
7. Type the current master HDP in the Enter Current Password field. then leave the Enter New Password
field blank, and press Enter twice.
8. Press F10.
9. Select Yes in the Setup Configuration window. Both user HDP and master HDP will have been removed.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Power management
To reduce power consumption, the computer has three power management modes: screen blank, sleep
(standby in Windows XP), and hibernation.
Screen blank mode
If the time set on the “Turn off monitor” timer in the operating system expires, the LCD backlight turns off.
To put the computer into screen blank mode, do as follows:
1. Press Fn+F3. A panel for selecting a power plan (in Windows XP, power scheme) appears.
2. Select Power off display (keep current power plan) (in Windows XP, keep current power scheme).
To end screen blank mode and resume normal operation, press any key.
Sleep (standby) mode
When the computer enters sleep (standby) mode, the following events occur in addition to what occurs
in screen blank mode:
• The LCD is powered off.
• The hard disk drive is powered off.
• The CPU stops.
To enter sleep (standby) mode, press Fn+F4.
Note: You can change the action of the Fn+F4 key combination by changing the settings in Power Manager.
In certain circumstances, the computer goes into sleep (standby) mode automatically:
• If a “suspend time” has been set on the timer, and the user does not do any operation with the keyboard,
the TrackPoint, the hard disk, the parallel connector, or the diskette drive within that time.
• If the battery indicator blinks orange, indicating that the battery power is low.
Note: Even if you do not set the low-battery alarm, the charge indicator notifies you when the battery is low,
and then the computer enters the power-saving mode automatically.
To cause the computer to return from sleep (standby) mode and resume operation, do one of the following:
• Press the Fn key.
• Open the LCD cover.
• Turn on the power switch.
Also, in either of the following events, the computer automatically returns from sleep (standby) mode and
resumes operation:
• The ring indicator (RI) is signaled by a serial device or a PC Card device.
• The time set on the resume timer elapses.
Note: The computer does not accept any input immediately after it enters sleep (standby) mode. Wait a
few seconds before taking any action to reenter operation mode.
Hibernation mode
In hibernation mode, the following occurs:
• The system status, RAM, VRAM, and setup data are stored on the hard disk.
Chapter 4. Related service information
41
• The system is powered off.
Note: If the computer enters the hibernation mode while it is docked to the docking station, do not undock it
before resuming normal operation. If you do undock it and then try to resume normal operation, you will get
an error message, and you will have to restart the system.
To cause the computer to enter hibernation mode, do any of the following:
• Press the Fn+F12 keys.
• If you have defined one of the following actions as the event that causes the system to go into hibernation
mode, perform that action.
– Closing the lid.
– Pressing the power button.
– Pressing Fn+F4 keys.
Also, the computer goes into hibernation mode automatically in either of the following conditions:
• If a “hibernation time” has been set on the timer, and if the user does not do any operation with the
keyboard, the TrackPoint, the hard disk drive, the parallel connector, or the diskette drive within that time.
• If the timer conditions are satisfied in suspend mode.
When the power is turned on, the computer returns from hibernation mode and resumes operation. The
hibernation file in the boot record on the hard disk drive is read, and system status is restored from the
hard disk drive.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Symptom-to-FRU index
This section contains following information:
• “Numeric error codes” on page 43
• “Error messages” on page 45
• “Beep symptoms” on page 46
• “No-beep symptoms” on page 46
• “LCD-related symptoms” on page 46
• “Intermittent problems” on page 48
• “Undetermined problems” on page 48
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most
likely cause is listed first, in boldface type.
Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular servicing, what FRUs are likely to need to be
replaced next.
A numeric error is displayed for each error detected in POST or system operation. In the displays, n can
be any number.
If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not
described there, go to “Intermittent problems” on page 48.
Note: For a device not supported by diagnostic codes in the ThinkPad Notebooks, see the manual for that device.
Numeric error codes
Table 2. Numeric error codes
Symptom or error
FRU or action, in sequence
0177
Bad SVP data, stop POST task—The checksum of the
supervisor password in the EEPROM is not correct.
System board.
0182
Bad CRC2. Enter the ThinkPad Setup program and load
Setup defaults.—The checksum of the CRS2 setting in
the EEPROM is not correct.
1. Run the ThinkPad Setup program. Press F9, and
Enter to load the default setting. Then save the
current setting by pressing F10.
2. System board.
0183
Bad CRC of Security Settings in EFI Variable. Enter the
ThinkPad Setup program.
0187
EAIA data access error—The access to EEPROM is failed.
System board.
0188
Invalid RFID Serialization Information Area.
System board.
0189
Invalid RFID configuration information area—The
EEPROM checksum is not correct.
System board.
0190
Critical low-battery error
1. Charge the battery pack.
2. Battery pack.
Chapter 4. Related service information
43
Table 2. Numeric error codes (continued)
Symptom or error
FRU or action, in sequence
0191
System Security—Invalid Remote Change requested.
1. Run the ThinkPad Setup program, and then save
current setting by pressing F10.
2. System board.
0199
System Security— Security password retry count
exceeded.
1. Run the ThinkPad Setup program, and then save
the current setting by pressing F10.
2. System board.
0251
System CMOS checksum bad— Default configuration
used.
1. Charge the backup battery for more than 8 hours
by connecting the ac power adapter.
2. Replace the backup battery and run the ThinkPad
setup program to reset the time and date.
0271
Real-time clock error. Check date and time settings.
1802
Unauthorized network card is plugged in—Turn off and
remove the miniPCI network card.
1820
More than one external fingerprint reader is attached.
Power off and remove all but the reader that you set up
within your main operating system.
Run the ThinkPad Setup program to reset the time
and date.
1. Remove Mini PCI network card.
2. System board.
Remove all but the reader that you set up for the
authentication.
2000
Hard Drive Active Protection sensor diagnostics
failed.Press <Esc> to continue.Press <F1> to enter
SETUP
1. Undock docking station or port replicator if it is
attached to the ThinkPad Notebook.
2. Place the ThinkPad Notebook on a horizontal surface.
Do not apply any physical shock to the computer.
3. Run Diagnostics ➙ ThinkPad Devices ➙ HDD
Active Protection Test.
2100
Detection error on HDD0 (Main HDD)
1. Reseat the hard disk drive.
2. Main hard disk drive.
3. System board.
2101
Detection error on HDD1 (Ultrabay HDD)
1. Reseat the hard disk drive.
2. Ultrabay hard disk drive.
3. System board.
2102
Detection error on HDD2 (Mini SATA)
1. Reseat the Mini SATA device.
2. Mini SATA device.
3. System board.
2110
Read error on HDD0 (Main HDD)
1. Reseat the hard disk drive.
2. Main hard disk drive.
3. System board.
2111
Read error on HDD1 (Ultrabay HDD)
1. Reseat the hard disk drive.
2. Ultrabay hard disk drive.
3. System board.
2112
Read error on HDD2 (Mini SATA)
1. Reseat the Mini SATA device.
2. Mini SATA device.
3. System board.
2200
Machine Type and Serial Number are invalid.
System board.
2201
Machine UUID is invalid
System board.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Error messages
Table 3. Error messages
Symptom or error
Fan error.
FRU or action, in sequence
1. Fan.
2. Thermal grease.
3. System board.
Thermal sensing error.
System board.
This system does not support batteries that are not
genuine Lenovo-made or authorized. This system will
continue to boot, but may not charge unauthorized
batteries.
Replace the battery.
Attention: Lenovo has no responsibility for the
performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out
of their use.
Chapter 4. Related service information
45
Beep symptoms
Table 4. Beep symptoms
Symptom or error
FRU or action, in sequence
One beep and a blank, unreadable, or flashing LCD.
1.
2.
3.
4.
One long and two short beeps, and a blank or unreadable
LCD.
1. System board.
2. LCD assembly.
3. DIMM.
Two short beeps with error codes.
Two short beeps and a blank screen.
Two or more beeps, or a continuous beep. Operating
system starts successfully.
Three short beeps, pause, three more short beeps, and
one short beep.
Reseat the LCD connector.
LCD assembly.
External CRT.
System board.
POST error. See “Numeric error codes” on page 43.
1. System board.
2. DIMM.
If a mini-PCI Ethernet card is installed, confirm that Alert
On LAN 2 in the ThinkPad Setup program is disabled.
1. DIMM.
2. System board.
One short beep, pause, three short beeps, pause, three
more short beeps, and one short beep.
Only the cursor appears.
Reinstall the operating system.
Four cycles of four short beeps and a blank screen.
System board (security chip)
Five short beeps and a blank screen.
System board
No-beep symptoms
Table 5. No-beep symptoms
Symptom or error
FRU or action, in sequence
No beep, power-on indicator on, LCD blank, and no
POST.
1. Make sure that every connector is connected
tightly and correctly.
2. DIMM.
3. System board.
No beep, power-on indicator on, and LCD blank during
POST.
1. Reseat DIMM.
2. System board.
The power-on password prompt appears.
A power-on password or a supervisor password is set.
Type the password and press Enter.
The hard-disk password prompt appears.
A hard-disk password is set. Type the password and
press Enter.
LCD-related symptoms
Important: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a
small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but
excessive pixel problems can cause viewing concerns.
If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the
LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.
Notes:
• This policy applies to all ThinkPad Notebooks purchased on 1 January, 2008 or later.
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ThinkPad T420 and T420i Hardware Maintenance Manual
• Lenovo will not provide replacement if the LCD is within specification as we cannot guarantee that any
replacement LCD will have zero pixel defects.
• One pixel consists of R, G, B sub-pixels.
Table 6. LCD-related symptoms
Symptom or error
FRU or action, in sequence
No beep, power-on indicator on, and a blank LCD during
POST.
System board.
•
•
•
•
LCD backlight not working.
LCD too dark.
LCD brightness cannot be adjusted.
LCD contrast cannot be adjusted.
1. Reseat the LCD connectors.
2. LCD assembly.
3. System board.
•
•
•
•
LCD screen unreadable.
Characters missing pixels.
Screen abnormal.
Wrong color displayed.
1.
2.
3.
4.
Horizontal or vertical lines displayed on LCD.
See important note for “LCD-related symptoms.”
Reseat all LCD connectors.
LCD assembly.
System board.
LCD assembly.
Chapter 4. Related service information
47
Intermittent problems
Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware
defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be
considered only when a problem recurs.
When analyzing an intermittent problem, do the following:
1. Run the diagnostic test for the system board in loop mode at least 10 times.
2. If no error is detected, do not replace any FRUs.
3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no
more errors exist.
Undetermined problems
If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed,
or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate
FRUs that have no defects).
Verify that all attached devices are supported by the computer.
Verify that the power supply being used at the time of the failure is operating correctly. (See “Power system
checkout” on page 34.)
1. Turn off the computer.
2. Visually check each FRU for damage. Replace any damaged FRU.
3. Remove or disconnect all of the following devices:
a. Non-ThinkPad devices
b. Devices attached to the docking station or the port replicator
c. Printer, mouse, and other external devices
d. Battery pack
e. Hard disk drive
f. External diskette drive or optical drive
g. DIMM
h. Optical disk or diskette in the internal drive
i. PC Cards
4. Turn on the computer.
5. Determine whether the problem has been solved.
6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU.
7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU):
a. System board
b. LCD assembly
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 5. Status indicators
This chapter presents the system status indicators that show the status of the computer.
1
6
2
4
3
5
9
7
8
© Copyright Lenovo 2011
49
5
6
11
10
Table 7. Status indicators
Indicator
1
Meaning
Speaker mute
Orange:
The speaker is on mute. To set the speakers on mute or unmute,
press the speaker mute button.
2
Microphone mute
Orange:
The microphone is on mute. None of the recording devices is
available while the microphone mute is on by default.
3
Wireless LAN, Wireless WAN,
or WiMAX status
Green:
The wireless LAN feature (the IEEE 802.11 b/g standard, 802.11
a/b/g, or 802.11n), wireless WAN feature, or WiMax feature is
on, and the radio link is ready for use.
Data is being transmitted.
4
Bluetooth wireless or Wireless
USB status
Green:
The Bluetooth wireless feature is on, and the radio link is ready
for use.
R
Data is being transmitted.
5
Device access
Green:
Data is being read from or written to the hard disk drive, the
diskette drive, or the drive in the Serial Ultrabay Enhanced
device. When this indicator is on, do not put the computer into
sleep (standby) mode or turn off the computer.
Note: Do not move the system while the green device access light is on.
Sudden physical shock could cause drive errors.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Table 7. Status indicators (continued)
Indicator
6
Power on
Meaning
Green:
The computer is on and ready to use. This indicator stays lit
around the power-on button whenever the computer is on and
is not in sleep (standby) mode.
Note: This indicator blinks when the computer is in sleep mode.
7
Numeric lock (On-screen
indicator)
8
Serial Ultrabay Enhanced
device status
By default, when the numeric lock is on, the numeric lock indicator is
displayed on the screen.
Green:
A Serial Ultrabay Enhanced device is installed and in use.
Blinking green:
A Serial Ultrabay Enhanced device is in the process of being
detached.
Turn off:
A Serial Ultrabay Enhanced device is ready to be attached or
detached.
9
Caps lock
Green:
Caps Lock mode is enabled. To enable or disable Caps Lock
mode, press the Caps Lock key.
10
Battery status
Green:
The battery charge level is 20% or higher.
Orange:
The battery charge level is between 5% and 20%.
Fast blinking orange:
The battery charge level is lower than 5% .
Slow blinking orange:
The battery is being charged. When it reaches 20%, the blinking
color changes to green.
Slow blinking green:
The battery charge level is between 20% and 80%, and
charging is continuing. When the battery reaches 80% charge,
the battery status indicator stops blinking, but the charging may
continue until the battery is 100% charged.
Note: If the computer is operating on battery power, the battery
status indicator does not work while the computer is turned off
or is in sleep (standby) mode or hibernation mode.
Quick blinking orange:
An error occurred in the battery.
The battery status indicator blinks three times:
Chapter 5. Status indicators
51
Table 7. Status indicators (continued)
Indicator
Meaning
The ac power adapter is attached to the computer.
The battery status indicator is off:
The battery pack of the computer is fully charged or detached.
11
Sleep (standby for Windows
XP) status
Green:
The computer is in sleep (standby) mode.
Blinking green:
The computer is entering sleep (standby) mode or hibernation
mode, or is resuming normal operation.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 6. Fn key combinations
The following table shows the function of each combination of Fn with a function key.
Table 8. Fn key combinations
Key combination
Description
Fn+F1
Reserved.
Fn+F2
Lock the computer.
Fn+F3
Select a power plan (in Windows XP, power scheme) that has been created by Power Manager,
or adjust the power level by using the slider control. When you press this combination, a
panel for selecting a power plan (power scheme) appears.
Notes:
To use this combination of the keys, ThinkPad PM device driver must have been installed
on the computer.
If you have logged on with an administrator user ID in Windows XP, and you press Fn+F3,
the panel for selecting a power scheme appears. If you have logged on with another user
ID in Windows XP, and you press Fn+F3, the panel does not appear.
Fn+F4
Put the computer in sleep (standby) mode. To return to normal operation, press the Fn key
only, without pressing a function key.
Notes:
To use this combination of the keys, ThinkPad PM device driver must have been installed
on the computer.
If you want to use the combination to put the computer into hibernation mode or
do-nothing mode (in Windows XP, shut the computer down or show the panel for turning
off the computer), change the settings in the Power Manager.
Fn+F5
Enable or disable the built-in wireless networking features. If you press Fn+F5, a list of wireless
features is displayed. You can quickly change the power state of each feature in the list.
Notes: If you want to use Fn+F5 to enable or disable the wireless features, the following
device drivers must be installed on the computer beforehand:
• Power Management driver
• OnScreen Display Utility
• Wireless device drivers
Fn+F6
Change the camera and audio settings. When you press Fn+F6, the camera and audio setting
window is opened and the camera preview is turned on.
Note: The camera settings area only appears if the computer has an integrated camera.
Fn+F7
Apply a presentation scheme directly, with no need to start Presentation Director.
To disable this function and use the Fn+F7 key combination for switching a display output
location, start Presentation Director, and change the settings.
Note: If the computer is an Windows 7 model, it does not support presentation schemes,
however the Fn+F7 combination might still be used to switch display output location.
For Windows 7:
Switch between the computer display and an external monitor. Windows will show these
display options:
• Computer display only (LCD)
• Computer display and external monitor (same image)
• Computer display and external monitor (extended desktop function)
• External monitor only
© Copyright Lenovo 2011
53
Table 8. Fn key combinations (continued)
Key combination
Description
Note: To switch between the computer display and an external monitor, the Win+P key
combination is also available.
For Windows Vista and Windows XP:
Switch between the computer display and an external monitor. If an external monitor is
attached, computer output is displayed in the following three patterns by turns:
• External monitor (CRT display)
• Computer display and external monitor (LCD + CRT display)
• Computer display (LCD)
Notes:
This function is not supported if different desktop images are displayed on the computer
display and the external monitor (the Extend desktop function).
This function does not work while a DVD movie or a video clip is playing.
To enable this function, start Presentation Director, and change the settings.
Note: Multiple users can log on to a single operating system by using different user IDs. Each
user needs to do the following: Click Start ➙ All Programs ➙ ThinkVantage ➙ Presentation
Director, and change the Fn+F7 settings.
Fn+F8
Change the settings of the UltraNav® pointing device.
Fn+F9
Reserved.
Fn+F10
Reserved.
Fn+F11
Reserved.
Fn+F12
Put the computer into hibernation mode. To return to normal operation, press the power
button for less than four seconds.
Notes:
To use this combination of the keys, ThinkPad PM device driver must have been installed
on the computer.
Though the screen fades out immediately after Fn+F12 are pressed, the computer
does not enter the hibernation mode immediately. Do not move the system until the
sleep (standby) status indicator stops blinking. Moving the computer when it is entering
hibernation might cause corruption of the hard disk drive.
Fn+PgUp
Turn the ThinkLight® on or off.
Note: This function is supported only on the ThinkPad Notebooks that have the ThinkLight.
The on or off status of the ThinkLight is shown on the screen for a few seconds when you
press Fn+PgUp.
Fn+Home
The computer display becomes brighter.
The purpose of this method is to change the brightness level temporarily. On Windows Vista,
the default brightness level is loaded after sleep (standby), hibernation, reboot, or detaching or
attaching an ac power adapter. To change the default brightness level, change the settings of
the Power Option in the Control Panel or use the Power Manager.
Fn+End
The computer display becomes dimmer.
The purpose of this method is to change the brightness level temporarily. On Windows Vista,
the default brightness level is loaded after sleep (standby), hibernation, reboot, or detaching or
attaching an ac power adapter. To change the default brightness level, change the settings of
the Power Option in the Control Panel or use the Power Manager.
Fn+Spacebar
54
Enable the Full Screen Magnifier function.
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 8. Fn key combinations (continued)
Key combination
Description
Fn+PrtSc
Have the same function as the SysRq key.
Fn+ScrLk
Enable or disable the numeric keypad. The indicator of numeric lock will be displayed on
the screen.
Fn+Pause
Have the same function as the Break key.
Fn+cursor keys
These key combinations work with Windows Media Player. They have the following functions:
• Fn + down arrow key: Play or Pause
• Fn + up arrow key: Stop
• Fn + right arrow key: Next Track
• Fn + left arrow key: Previous Track
Chapter 6. Fn key combinations
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 7. FRU replacement notices
This chapter presents notices related to removing and replacing parts. Read this chapter carefully before
replacing any FRU.
External CRU statement to customers:
Some problems with your product can be resolved with a replacement part you can install yourself, called
a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as Self-service CRUs and others
are designated as Optional-service CRUs. Installation of Self-service CRUs is your responsibility; you may
request that Lenovo installs an Optional-service CRU according to the warranty service for your product.
Where you are installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement
instructions are shipped with your product and are available from Lenovo at any time upon request. You may
find a list of CRUs in the publications that ship with your product or at http://www.lenovo.com/CRUs. You
may be required to return the defective part that is replaced by the CRU. When return is required: (1) return
instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you
may be charged for the replacement CRU if Lenovo does not receive the defective part within thirty (30) days
of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.
Screw notices
Loose screws can cause a reliability problem. In the ThinkPad Notebook, this problem is addressed with
special nylon-coated screws that have the following characteristics:
•
•
•
•
They maintain tight connections.
They do not easily come loose, even with shock or vibration.
They are harder to tighten.
Each one should be used only once.
Do the following when you service this machine:
• Keep the screw kit (for the P/N, see “Miscellaneous parts” on page 156) in your tool bag.
• Always use new screws.
• Use a torque screwdriver if you have one.
Tighten screws as follows:
• Plastic to plastic
Turn an additional 90 degrees after the screw head touches the surface of the plastic part:
• Logic card to plastic
Turn an additional 180 degrees after the screw head touches the surface of the logic card:
© Copyright Lenovo 2011
57
• Torque driver
If you have a torque driver, refer to the “Torque” column for each step.
• Make sure that you use the correct screw. If you have a torque screwdriver, tighten all screws firmly to the
torque shown in the table. Never use a screw that you removed. Use a new one. Make sure that all
of the screws are tightened firmly.
• Ensure torque screw drivers are calibrated correctly following country specifications.
Retaining serial numbers
This section includes the following descriptions:
•
•
•
“Restoring the serial number of the system unit” on page 58
“Retaining the UUID” on page 59
“Reading or writing the ECA information” on page 59
Restoring the serial number of the system unit
When the computer was manufactured, the EEPROM on the system board was loaded with the serial
numbers of the system and all major components. These numbers need to remain the same throughout
the life of the computer.
If you replace the system board, you must restore the serial number of the system unit to its original value.
Before replacing the system board, save the original serial number by doing the following:
1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the
computer.
2. From the main menu, select 1. Set System Identification.
3. Select 2. Read S/N data from EEPROM.
The serial number of each device in your computer is displayed; the serial number of the system unit is
listed as follows:
• 20: Serial number
Write down that number.
Note: The serial number of the system unit is also written on the label attached to the bottom of the computer.
After you have replaced the system board, restore the serial number by doing the following:
1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later and restart the
computer.
2. From the main menu, select 1. Set System Identification.
3. Select 1. Add S/N data from EEPROM. Follow the instructions on the screen.
If the MTM and Product ID numbers differ from each other on the rear label, use what is shown for the
Product ID field. See example below:
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ThinkPad T420 and T420i Hardware Maintenance Manual
MTM on rear label:
TTTT-CTO S/N SSSSSSS
Product ID on rear label:
TTTT-MMM (Use this number when setting Serial
Number)
In the example, the Serial Number to be input is “1STTTTMMMSSSSSSS”.
Retaining the UUID
The Universally Unique Identifier (UUID) is a 128-bit number uniquely assigned to your computer at
production and stored in the EEPROM of your system board. The algorithm that generates the number is
designed to provide unique IDs until the year A.D. 3400. No two computers in the world have the same
number.
When you replace the system board, you must set the UUID on the new system board as follows:
1. Install the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the
computer.
2. From the main menu, select 4. Assign UUID. A new UUID is created and written. If a valid UUID already
exists, it is not overwritten.
Reading or writing the ECA information
Information on Engineering Change Announcements (ECA) are stored in the EEPROM of the system board.
The electronic storage of this information simplifies the procedure to check if the ECA has been previously
applied to a machine. The machine does not need to be disassembled to check for the ECA application.
To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write
function on the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later.
1. Insert the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the
computer.
2. From the main menu, select 6. Set ECA Information.
3. To read ECA information, select 2. Read ECA/rework number from EEPROM and follow the
instruction.
4. To read box build date, select 5. Read box build date from EEPROM, and follow the instruction on
the screen.
After an ECA has been applied to the machine, the EEPROM must be updated to reflect the ECA's
application. Use the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later to update the
EEPROM.
Note: Only the ECA number is stored in the EEPROM. The machine type of the ECA is assumed be the same
as the machine type of the machine that had the ECA applied to it.
1. Insert the LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later, and restart the
computer.
2. From the main menu, select 6. Set ECA Information.
3. To write ECA information, select 1. Write ECA/rework number from EEPROM, and follow the
instruction.
4. To write box build date, select 4. Write box build date from EEPROM, and follow the instruction on
the screen.
If the system board is being replaced, try to read the ECA information from the old system board and transfer
the information to the new system. If the system board is inoperable, this will not be possible.
Chapter 7. FRU replacement notices
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 8. Removing and replacing a FRU
This chapter presents directions and drawings for use in removing and replacing a FRU.
External CRU statement to customers:
Some problems with your product can be resolved with a replacement part you can install yourself, called
a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as Self-service CRUs and others
are designated as Optional-service CRUs. Installation of Self-service CRUs is your responsibility; you may
request that Lenovo installs an Optional-service CRU according to the warranty service for your product.
Where you are installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement
instructions are shipped with your product and are available from Lenovo at any time upon request. You may
find a list of CRUs in the publications that ship with your product or at http://www.lenovo.com/CRUs. You
may be required to return the defective part that is replaced by the CRU. When return is required: (1) return
instructions, a prepaid shipping label, and a container will be included with the replacement CRU; and (2) you
may be charged for the replacement CRU if Lenovo does not receive the defective part within thirty (30) days
of your receipt of the replacement CRU. See your Lenovo Limited Warranty documentation for full details.
Be sure to observe the following general rules:
1. Do not try to service any computer unless you have been trained and certified. An untrained person runs
the risk of damaging parts.
2. Before replacing any FRU, review Chapter 7 “FRU replacement notices” on page 57.
3. Begin by removing any FRUs that have to be removed before replacing the failing FRU. Any such FRUs
are listed at the top of each FRU replacement page. Remove them in the order in which they are listed.
4. Follow the correct sequence in the steps for removing a FRU, as given in the drawings by the numbers
in square callouts.
5. When turning a screw to replace a FRU, turn it in the direction as given by the arrow in the drawing.
6. When removing a FRU, move it in the direction as given by the arrow in the drawing.
7. To put the new FRU in place, reverse the removal procedure and follow any notes that pertain to
replacement. For information about connecting and arranging internal cables, see Chapter 9 “Locations”
on page 125.
8. When replacing a FRU, use the correct screw(s) as shown in the procedures.
DANGER
Before removing any FRU, turn off the computer, unplug all power cords from electrical outlets,
remove the battery pack, and then disconnect any interconnecting cables.
Attention: After replacing a FRU, do not turn on the computer until you have made sure that all screws,
springs, and other small parts are in place and none are loose inside the computer. Verify this by shaking
the computer gently and listening for rattling sounds. Metallic parts or metal flakes can cause electrical
short circuits.
Attention: The system board is sensitive to, and can be damaged by, electrostatic discharge. Before
touching it, establish personal grounding by touching a ground point with one hand or by using an
electrostatic discharge (ESD) strap (P/N 6405959).
© Copyright Lenovo 2011
61
Before servicing ThinkPad T420 and T420i
Some models of the ThinkPad T420 and T420i you are servicing might have the SIM card that the customer
has installed.
If the computer you are servicing has the SIM card, remove it before you start the servicing.
To remove the SIM card, you need to remove the battery pack first. (See “1010 Battery pack” on page 63.)
After you finish the servicing, make sure that you insert the card back into the slot firmly.
2
1
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ThinkPad T420 and T420i Hardware Maintenance Manual
1010 Battery pack
Important notice for replacing a battery pack:
Lenovo ThinkVantage Toolbox (in Windows 7) has an automatic battery diagnostic that determines if the
battery pack is defective. A battery pack FRU should not be replaced unless this diagnostic shows that
the battery is defective.
The only exception to this is if the battery pack is physically damaged or a customer is reporting a possible
safety issue.
If Lenovo ThinkVantage Toolbox is not installed in the computer, the customer should download this program
before a non-physically damaged battery pack is replaced. Note that the replacement of a physically
damaged battery pack is not covered by the warranty.
Removal steps of battery pack
DANGER
Use only the battery specified in the parts list for your computer. Any other battery could ignite
or explode.
Unlock the battery latch 1 . Holding the battery latch in the unlocked position 2 , remove the battery pack in
the direction shown by arrow 3 .
1
2
3
When installing: Install the battery pack in the slot. Make sure that the battery latch is in the locked position.
Chapter 8. Removing and replacing a FRU
63
1020 ExpressCard blank bezel
Removal steps of ExpressCard blank bezel
When you press the ExpressCard blank bezel 1 , it pops out 2 .
1
2
When installing: Make sure that the bezel is correctly oriented as shown in the following figure.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1030 Serial Ultrabay Enhanced device or travel bezel
For access, remove this FRU:
• “1010 Battery pack” on page 63
Removal steps of Serial Ultrabay Enhanced device or travel bezel
Holding the bay lock latch in the unlocked position 1 , slide the bay eject latch in the direction shown by
arrow 2 , and then pull out the Serial Ultrabay Enhanced device or the travel bezel in the direction shown by
arrow 3 to completely remove it.
1
2
3
Chapter 8. Removing and replacing a FRU
65
1040 Hard disk drive (HDD) and solid state drive (SSD)
For access, remove this FRU:
• “1010 Battery pack” on page 63
Attention:
• Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper
handling can cause damage and permanent loss of data.
• Before removing the drive, have the user make a backup copy of all the information on it if possible.
• Never remove the drive while the system is operating or is in suspend mode.
Removal steps of hard disk drive and solid state drive
Note: Loosen the screw 1 , but do not remove it.
4
4
1
2
Step
Screw (quantity)
Color
Torque
1
Capture screw (1)
Black
0.181 Nm
(1.85 kgfcm)
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ThinkPad T420 and T420i Hardware Maintenance Manual
4
3
For HDD and HDD rubber rails (9.5 mm):
4
4
For HDD and HDD rubber rails (7.0mm) :
4
4
For SSD and spacers:
4
4
Chapter 8. Removing and replacing a FRU
67
When installing: Make sure that SSD spacers or HDD rubber rails are attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1050 DIMM slot cover
For access, remove this FRU:
• “1010 Battery pack” on page 63
Removal steps of DIMM slot cover
Note: Loosen the screw 1 , but do not remove it.
2
Chapter 8. Removing and replacing a FRU
69
1060 DIMM (in the slot on the underside of the computer)
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
Note: Your computer has two DIMM slots: one under the keyboard and another on the underside of the
computer. If you install a DIMM in only one of the two slots, install it in the slot located under the keyboard.
Removal steps of DIMM (in the slot on the underside of the computer)
1
2
1
When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it
until it snaps into place. Make sure that it is firmly fixed in the slot and does not move easily.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1070 PCI Express Mini Card for wireless WAN
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
Removal steps of PCI Express Mini Card for wireless WAN
In step 1 , unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159), or pick the
connectors with your fingers and gently unplug them in the direction of the arrow.
1
1
2
Step
Screw (quantity)
Color
Torque
2
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
71
3
Note: Plug the yellow cable into the jack labeled MAIN, and the blue cable into the jack labeled AUX
on the card.
If the computer you are servicing is a wireless WAN-ready model and does not have a wireless WAN card,
route the antenna cables and secure them with a tape as shown in the following figure.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1080 Keyboard
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
Removal steps of keyboard
1
Step
Screw (quantity)
Color
Torque
1
M2 × 10 mm, wafer-head, nylon-coated (1)
Silver
0.181 Nm
(1.85 kgfcm)
Push down the keyboard a little and slide it toward the arrow 2 to detach the front edge of the keyboard
from the frame.
2
Chapter 8. Removing and replacing a FRU
73
Lift the keyboard a little in the direction shown by arrow 3 , and then detach the connector 4 .
Installation steps of keyboard
When installing the keyboard, do the following:
1. Attach the keyboard connector.
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ThinkPad T420 and T420i Hardware Maintenance Manual
2. Attach the keyboard so that the keyboard edges a are under the frame.
3. To make sure that the front edge of the keyboard is housed firmly, gently press the keys with your palms
and slightly slide the keyboard toward you until it snaps into position.
Chapter 8. Removing and replacing a FRU
75
4. Make sure that the front edge of the keyboard b is attached firmly.
b
b
b
5. Secure the keyboard by tightening the screws from the bottom side of the computer.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1090 DIMM (in the slot under the keyboard)
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
Note: Your computer has two DIMM slots: one under the keyboard and another on the underside of the
computer. If you install a DIMM in only one of the two slots, install it in the slot located under the keyboard.
Removal steps of DIMM (in the slot under the keyboard)
Chapter 8. Removing and replacing a FRU
77
2
1
3
2
When installing: Insert the notched end of the DIMM into the socket. Press the DIMM firmly, and pivot it
until it snaps into place. Make sure that it is firmly fixed in the slot and does not move easily.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1100 Backup battery
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
Removal steps of backup battery
DANGER
Use only the battery specified in the parts list for your computer. Any other battery could ignite
or explode.
Cable routing: Attach the backup battery and route the cable as shown in the figure below and make
sure that the battery connector is attached firmly.
Chapter 8. Removing and replacing a FRU
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1110 PCI Express Mini Card for wireless LAN
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
Removal steps of PCI Express Mini Card for wireless LAN
In step 1 , unplug the jacks by using the removal tool antenna RF connector (P/N: 08K7159), or pick the
connectors with your fingers and gently unplug them in the direction of the arrow.
Note: Some models might have only two antenna cables.
Step
Screw (quantity)
Color
Torque
2
M2 × 10 mm, wafer-head, nylon-coated (1)
Silver
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
81
3
When installing:
• In models with a wireless LAN card that has two antenna connectors, plug the gray cable into the jack
marked MAIN or M, and the black cable into the jack marked AUX or A on the card. If the computer
you are servicing has three cables, put the white cable in the cable protection tube and secure it with a
tape as shown in this figure.
• In models with a wireless LAN card that has three antenna connectors, plug the gray cable (MAIN) into
the jack marked TR1, the white cable (third) into the jack marked RO or TR3, and the black cable (AUX)
into the jack marked TR2 on the card.
.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter
card
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
Note: The FPC cable is attached on the underside of the keyboard bezel assembly. In some models, the
Bluetooth daughter card is also attached on the underside of the keyboard bezel assembly. For the models
that do not have a Bluetooth daughter card, skip steps 8 to 10 .
Removal steps of keyboard bezel assembly, FPC cable, and Bluetooth daughter card
2
1
2
2
2
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
2
M2 × 15 mm, wafer-head, nylon-coated (4)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
83
Step
Screw (quantity)
Color
Torque
3
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
4
Shoulder screw (2)
Silver
0.181 Nm
(1.85 kgfcm)
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ThinkPad T420 and T420i Hardware Maintenance Manual
7
6
When installing: Make sure that the connector is attached firmly.
Chapter 8. Removing and replacing a FRU
85
17
17
When installing: Make sure that the connectors are attached firmly.
19
18
Step
Screw (quantity)
Color
Torque
13
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
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20
When installing: Make sure that the connector is attached firmly.
Chapter 8. Removing and replacing a FRU
87
1130 SmartCard
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
Removal steps of SmartCard
1
1
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
3
2
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ThinkPad T420 and T420i Hardware Maintenance Manual
When installing: Make sure that the connector is attached firmly.
Removal steps of SmartCard dummy spacer
Some models have a SmartCard dummy spacer as a miscellaneous part. For those models, remove the
spacer as shown:
1
1
2
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
89
1140 Modem daughter card (MDC)
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
Removal steps of modem daughter card (MDC)
1
1
2
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
When installing: Make sure that the connector is attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1150 Speaker assembly
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
• “1080 Keyboard” on page 73
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
Removal steps of speaker assembly
1
1
1
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (3)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
91
3
2
3
When installing: Attach the speaker assembly and route the cable as shown in the following figure, and
make sure that the speaker connector is attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1160 LCD unit
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
Removal steps of LCD unit
1
1
Step
Screw (quantity)
Color
Torque
1
M2.5 × 6 mm, wafer-head, nylon-coated (2)
Black
0.392 Nm
(4.0 kgfcm)
Chapter 8. Removing and replacing a FRU
93
2
3
Step
Screw (quantity)
Color
Torque
2
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
6
4
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ThinkPad T420 and T420i Hardware Maintenance Manual
Step
Screw (quantity)
Color
Torque
6
M2.5 × 6 mm, wafer-head, nylon-coated (2)
Black
0.392 Nm
(4.0 kgfcm)
8
7
7
7
When installing:
• Make sure that you attach the connectors firmly.
• Make sure that you route the cables correctly and you tape up in the proper positions as shown in
the above figure.
• When you route the cables, make sure that they are not subjected to any tension. Tension could cause
the cables to be damaged by the cable guides, or a wire to be broken.
Chapter 8. Removing and replacing a FRU
95
9
10
10
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ThinkPad T420 and T420i Hardware Maintenance Manual
1170 Fan assembly
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
Removal steps of fan assembly
Note: Loosen the screws 1a to 1d in order, but do not remove them.
For Discrete Graphics models:
2
1a
1d
1c
1b
For Integreted Graphics models:
Chapter 8. Removing and replacing a FRU
97
1a
1d
1c
1b
Step
Screw (quantity)
Color
Torque
1
Capture shoulder screw (4)
Silver
0.181 Nm
(1.85 kgfcm)
2
M2 × 3 mm, wafer-head, nylon-coated (1)
black
0.181 Nm
(1.85 kgfcm)
For Discrete Graphics models:
3
4
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ThinkPad T420 and T420i Hardware Maintenance Manual
For Integreted Graphics models:
2
3
When installing:
• Before you attach the fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on
the parts marked a as in the following figures. Either too much or too less application of grease can
cause a thermal problem due to imperfect contact with a component. For the fan in the integrated
graphics models, you need to peel the thin film off from the thermal rubber marked b .
For Discrete Graphics models:
a
b
For Integrated Graphics models:
Chapter 8. Removing and replacing a FRU
99
a
• When attaching the fan assembly to the frame, take care not to damage the heat sink a of the fan
assembly.
• Make sure that the fan connector is attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
1180 CPU
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “1170 Fan assembly” on page 97
Attention: The CPU is extremely sensitive. When you service the CPU, avoid any kind of rough handling.
Removal steps of CPU
Rotate the head of the screw in the direction shown by arrow 1 to release the lock, and then remove the
CPU 2 . After that peel the mylar off from the CPU as shown by arrow 4 .
2
4
1
3
When installing: Make sure that the mylar is attached to the CPU. Place the CPU on the CPU socket, and
then rotate the head of the screw in the direction shown by arrow 3 to secure the CPU.
Chapter 8. Removing and replacing a FRU
101
1190 Base cover assembly and DC-in connector cable
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65
• “1040 Hard disk drive (HDD) and solid state drive (SSD)” on page 66
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “1170 Fan assembly” on page 97
Removal steps of base cover assembly and DC-in connector cable
1
1
1
1
1
Step
Screw (quantity)
Color
Torque
1
M2 × 8 mm, wafer-head, nylon-coated (5)
Black
0.181 Nm
(1.85 kgfcm)
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ThinkPad T420 and T420i Hardware Maintenance Manual
2
2
2
2
2
2
2
2
3
4
Step
Screw (quantity)
Color
Torque
2
M2 × 5 mm, wafer-head, nylon-coated (8)
Black
0.181 Nm
(1.85 kgfcm)
When installing: Make sure that the connector is attached firmly.
6
5
When installing: Make sure that the wireless switch is adjusted as shown in callout a .
Chapter 8. Removing and replacing a FRU
103
7
Step
Screw (quantity)
Color
Torque
7
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
Note: Applying labels to the base cover
The new base cover FRU is shipped with a kit containing labels of several kinds.
When you replace the base cover, you need to apply the following label:
17
Homologation label
The following labels need to be peeled off from the old base cover, and need to be put on the new base cover.
Note: If the COA label 1 is attached to a part that is replaced, return the old part with the label attached to
the customer, or provide a letter to the customer stating what the label was originally on the system and
what the label part number, serial number, and product key were.
1
Windows Certificate of Authentication label (COA)
2
Wireless LAN MAC address label
3
Information label
4
Ethernet MAC address label
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ThinkPad T420 and T420i Hardware Maintenance Manual
5
Wireless WAN MAC address label
6
China mobile IMEI label
7
China telecom IMEI label
8
SIRM labels (only for Malaysia)
9
Wireless card label (only for Brazil)
10
Anatel label (only for Brazil)
11
Modem AMOM label (only for Brazil)
12
Bluetooth label (only for Brazil)
13
Israel label (50 mm x 19 mm)
14
No MIC label (only for TAA module assembled in Mexico)
15
Vodafone label
16
FCC label
18
Asset tag
19
Serial number label
20
Product label
21
China wireless WAN label
22
China modem label
For some models, you need to apply two FCC labels. Check the old base cover; if it has two FCC labels,
apply both to the new base cover.
For the location of each label, refer the following figure:
1
2
3
4
5
6
7
22
21
8
20
19
18
17
13
14
16
15
9
10
12
11
Chapter 8. Removing and replacing a FRU
105
1200 Magnesium structure frame
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65
• “1040 Hard disk drive (HDD) and solid state drive (SSD)” on page 66
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “1170 Fan assembly” on page 97
• “1180 CPU” on page 101
• “1190 Base cover assembly and DC-in connector cable” on page 102
Removal steps of magnesium structure frame
1
2
2
3
3
5
4
4
Step
Screw (quantity)
Color
Torque
2
M2 × 5 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
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ThinkPad T420 and T420i Hardware Maintenance Manual
3
M2 × 8 mm, wafer-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
4
Hex stud, nylon-coated (2)
Silver
0.392 Nm
(4.0 kgfcm)
Chapter 8. Removing and replacing a FRU
107
1210 System board and ExpressCard slot assembly
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1030 Serial Ultrabay Enhanced device or travel bezel” on page 65
• “1040 Hard disk drive (HDD) and solid state drive (SSD)” on page 66
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “1170 Fan assembly” on page 97
• “1180 CPU” on page 101
• “1190 Base cover assembly and DC-in connector cable” on page 102
Important notices for handling the system board:
When handling the system board, bear the following in mind.
• The system board has an accelerometer, which can be broken by applying several thousands of G-forces.
Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench can subject
the accelerometer to as much as 6,000 G's of shock.
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or composite.
• If a system board is dropped, you must test it, using PC-Doctor for DOS, to make sure that the HDD Active
Protection System™ still functions.
Note: If the test shows that HDD Active Protection System is not functioning, be sure to document the drop in a
reject report, and replace the system board.
• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a corrugated
conductive surface.
After replacing the system board, run PC-Doctor for DOS to make sure that HDD Active Protection System still
functions. The procedure is as follows:
1. Place the computer on a horizontal surface.
2. Run Diagnostics ➙ ThinkPad Devices ➙ HDD Active Protection Test.
Attention: Do not apply physical shock to the computer while the test is running.
Removal steps of system board and ExpressCard slot assembly
The following components soldered on the top side of the system board are extremely sensitive. When you
service the system board, avoid any kind of rough handling.
a
CPU
b
Accelerometer chip for the HDD Active Protection System
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ThinkPad T420 and T420i Hardware Maintenance Manual
c
Platform Controller Hub (PCH)
d
Graphic Processing Unit (GPU) (Discrete graphics chip)
Note: The GPU d is only for models with switchable graphics. Models with integrated graphics
do not have a GPU on the system board.
For Switchable Graphics models:
a
d
c
b
For Integrated Graphics models:
a
c
b
1
Chapter 8. Removing and replacing a FRU
109
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
2
When installing: Make sure that the connector is attached firmly.
1220 mSATA solid state drive
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1050 DIMM slot cover” on page 69
Attention:
• Do not drop the drive or apply any physical shock to it. The drive is sensitive to physical shock. Improper
handling can cause damage and permanent loss of data.
• Before removing the drive, have the user make a backup copy of all the information on it if possible.
• Never remove the drive while the system is operating or is in suspend mode.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Removal steps of mSATA solid state drive
1
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
2
Chapter 8. Removing and replacing a FRU
111
2010 LCD bezel assembly
For access, remove the following FRU:
• “1010 Battery pack” on page 63
Removal steps of LCD bezel assembly
2
1
1
1
1
1
1
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ThinkPad T420 and T420i Hardware Maintenance Manual
2020 LED board
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “2010 LCD bezel assembly” on page 112
Removal steps of LED board
1
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, flat-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
113
When installing: Make sure that the connector is attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
2030 Integrated camera
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “2010 LCD bezel assembly” on page 112
Removal steps of integrated camera
1
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, flat-head, nylon-coated (1)
Black
0.181 Nm
(1.85 kgfcm)
Chapter 8. Removing and replacing a FRU
115
2
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ThinkPad T420 and T420i Hardware Maintenance Manual
2040 LCD panel and LCD cable
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “2010 LCD bezel assembly” on page 112
• “2020 LED board” on page 113
• “2030 Integrated camera” on page 115
Removal steps of LCD panel and LCD cable
1
4
1
1
1
5
3
2
Step
Screw (quantity)
Color
Torque
1
M2 × 3 mm, wafer-head, nylon-coated (4)
Black
0.181 Nm
(1.85 kgfcm)
When installing: When attaching the LCD panel to the cover, gently press the left and right edges covered
with metal. DO not press the surface of the panel or apply any excessive force to the panel.
Chapter 8. Removing and replacing a FRU
117
7
6
When installing: Make sure that the connector is attached firmly.
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ThinkPad T420 and T420i Hardware Maintenance Manual
2050 Camera cable
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “2010 LCD bezel assembly” on page 112
• “2020 LED board” on page 113
• “2030 Integrated camera” on page 115
• “2040 LCD panel and LCD cable” on page 117
Removal steps of camera cable
1
1
1
1
1
Chapter 8. Removing and replacing a FRU
119
2060 Wireless LAN antenna assembly or wireless LAN/WAN antenna
assembly
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “2010 LCD bezel assembly” on page 112
• “2020 LED board” on page 113
• “2030 Integrated camera” on page 115
• “2040 LCD panel and LCD cable” on page 117
• “2050 Camera cable” on page 119
Removal steps of wireless LAN antenna assembly or wireless LAN/WAN antenna assembly
2
2
2
2
1
1
1
1
1
1
1
1
When installing: When you install the antenna kit, route the cables as shown in the figure above. As you
route the cables, make sure that they are not subjected to any tension. Tension could cause the cables to be
damaged by the cable guides, or a wire to be broken.
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ThinkPad T420 and T420i Hardware Maintenance Manual
3
3
4
4
Step
Screw (quantity)
Color
Torque
3
M2 × 3 mm, flat-head, nylon-coated (2)
Black
0.181 Nm
(1.85 kgfcm)
5
5
Chapter 8. Removing and replacing a FRU
121
2070 Hinges and LCD rear cover assembly
For access, remove these FRUs in order:
• “1010 Battery pack” on page 63
• “1020 ExpressCard blank bezel” on page 64
• “1050 DIMM slot cover” on page 69
• “1070 PCI Express Mini Card for wireless WAN” on page 71
• “1080 Keyboard” on page 73
• “1110 PCI Express Mini Card for wireless LAN” on page 81
• “1120 Keyboard bezel assembly, FPC cable, and Bluethooth daughter card” on page 83
• “1150 Speaker assembly” on page 91
• “1160 LCD unit” on page 93
• “2010 LCD bezel assembly” on page 112
• “2020 LED board” on page 113
• “2030 Integrated camera” on page 115
• “2040 LCD panel and LCD cable” on page 117
• “2050 Camera cable” on page 119
• “2060 Wireless LAN antenna assembly or wireless LAN/WAN antenna assembly” on page 120
Removal steps of hinges and LCD rear cover assembly
1
1
3
2
1
1
3
2
Step
Screw (quantity)
Color
Torque
1
M2.5 × 4 mm, wafer-head, nylon-coated (4)
Black
0.392 Nm
(4.0 kgfcm)
When installing: Attach the hinges as shown in the following figure.
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 8. Removing and replacing a FRU
123
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 9. Locations
This chapter presents the locations of ThinkPad T420 and T420i hardware components.
Front view
1
Integrated camera (for some models)
2
ThinkLight
3
Built-in microphone
4
Built-in speakers
5
Security keyhole
6
Universal serial bus (USB)/eSATA combo connector
7
USB connector
8
Media Card Reader slot
9
ExpressCard slot
10
Serial Ultrabay Enhanced drive or travel bezel
11
Combo audio jack
12
Fingerprint reader
13
Touch pad buttons
14
Touch pad
15
TrackPoint buttons
16
TrackPoint pointing stick
17
UltraNav
18
Volume control buttons
19
ThinkVantage button
20
Power switch
21
Status indicators
Note: For the description of each indicator, see Chapter 5 “Status indicators” on page 49.
© Copyright Lenovo 2011
125
3
1
2
21
3
20
19
18
5
16
4
15
5
14
6
17
13
7
10
12
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ThinkPad T420 and T420i Hardware Maintenance Manual
11
9
8
Rear view
1
Status indicators
Note: For the description of each indicator, see Chapter 5 “Status indicators” on page 49.
2
SmartCard slot
3
DisplayPort connector
4
USB connector
5
RJ-45 (Ethernet) connector
6
External monitor connector
7
Power jack
8
USB connector
9
Modem connector or IEEE 1394
1
9
8
2
3
7
6 6
55
4
Chapter 9. Locations
127
Bottom view
1
Battery pack
2
Battery pack latch
3
DIMM slot
4
Docking connector
5
LCD cover latch
6
Serial Ultrabay Enhanced lock latch
7
Serial Ultrabay Enhanced eject latch
7
6
1
2
3
4
5
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ThinkPad T420 and T420i Hardware Maintenance Manual
Chapter 10. Parts list
This chapter contains following lists of the service parts.
• “Overall” on page 130
• “LCD FRUs” on page 150
• “Keyboard” on page 154
• “Miscellaneous parts” on page 156
• “Information about ac power adapters” on page 158
• “Power cords” on page 159
• “Recovery discs” on page 160
• “Common service tools” on page 166
Notes:
• Each FRU is available for all types or models, unless specific types or models are specified.
• FRU with specific models listed and described as xxU (where U is an example of a country designator) should be
used for all models ending in U.
• FRU with specific models listed and described as 3Dx (where 3D is an example of a unique configuration) should be
used for all of these models, unless specific country or region designator is specified.
• A CRU (customer replaceable unit) is identified by a single asterisk (*) or two asterisks (**) in the CRU ID column. An
N in the CRU ID column means that the part is not a CRU. A single asterisk (*) means that the part is a Self-service
CRU; two asterisks (**) means that the part is an Optional-service CRU.
External CRU statement to customers:
Some problems with your product can be resolved with a replacement part you can install yourself, called
a “Customer Replaceable Unit” or “CRU.” Some CRUs are designated as Self-service CRUs and others are
designated as Optional-service CRUs. Installation of Self-service CRUs is your responsibility; you may request
that Lenovo installs an Optional-service CRU according to the warranty service for your product. Where you are
installing the CRU, Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped
with your product and are available from Lenovo at any time upon request. You may find a list of CRUs in the
publications that ship with your product or at http://www.lenovo.com/CRUs. You may be required to return the
defective part that is replaced by the CRU. When return is required: (1) return instructions, a prepaid shipping label,
and a container will be included with the replacement CRU; and (2) you may be charged for the replacement CRU if
Lenovo does not receive the defective part within thirty (30) days of your receipt of the replacement CRU. See your
Lenovo Limited Warranty documentation for full details.
ThinkPad Notebooks contain the following types of CRUs:
Self-service CRUs: These CRUs unplug or are held by no more than two screws. Examples of these types
of CRUs include the ac power adapter, power cord, battery, and hard disk drive. Other Self-service CRUs
depending on product design may include the memory module, wireless card, keyboard, and palm rest with
finger print reader and touchpad.
Optional-service CRUs: These CRUs are isolated parts within the computer that are concealed by an access
panel that is typically secured by more than two screws. Once the access panel is removed, the specific
CRU is visible.
• FRUs marked with OP are available as options.
© Copyright Lenovo 2011
129
Overall
1
30
29
2
3
4
28
27
a
26
b
5
c
25
24
6
7
23
22
21
8
9
10
20
19
11
12
18
13
17
14
16
3
15
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ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall
No.
FRU (Overall)
FRU no.
CRU ID
a-c
See “Miscellaneous parts” on page 156.
1
LCD unit (see “LCD FRUs” on page 150.)
2
ThinkPad b/g/n Wireless (1x1 BGN)
• 4177-CTO, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Kx,
2Lx, 2Mx, 2Xx, 2Yx, 36x, GFx, GKx, GLx, GMx, Q7x, QDx, QQx, QRx, QSx,
R4x, RDx, RFx, RNx, RPx
• 4178-CTO, 53x, 6Bx, 6Cx, 6Dx, 6Ex, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx,
9Sx, 9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, AGx, AHx, AMx, AQx, ARx, AZx, B2x, B3x,
B4x, B5x, B6x, BDx, BEx, BFx, BHx, BJx, BMx, BNx, CCx, CDx, CRx, CSx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GGx, GHx, GJx, GMx,
GNx, GPx, GSx, GTx, GUx, GXx
• 4180-CTO, LEx, LFx, LGx, LHx, LJx, LKx, LNx, LPx, LRx, LSx, LTx, MAx, PDx,
PEx
• 4236-CTO, N6x, N7x, N8x, N9x, NCx, NKx, NLx, P4x, PBx, PPx, PQx
• 4237-CTO
• 4238-CTO
60Y3247
60Y3249
**
2
Intel® Centrino® Wireless-N 1000
• 4177-CTO, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 32x, 33x, 34x, QGx, QJx, QKx,
QLx, QMx, QPx, QTx, QVx, QWx, QXx, QYx, QZx, R2x, R3x, R5x, R6x, R9x,
RBx, RCx, RGx, RHx, RJx, RQx, RRx, RSx, RTx, RUx, RVx, RYx, RZx
• 4178-CTO, 5Jx, 66x, 6Mx, 6Nx, 6Tx, 82x, 83x, 84x, A5x, A6x, A7x, AAx, ACx,
ADx, AEx, AFx, AJx, AKx, AUx, AVx, B7x, B8x, B9x, BAx, BBx, BCx, BKx, BPx,
BQx, BRx, BUx, BVx, BWx, BXx, C2x, C9x, CEx, CFx, CGx, CHx, CJx, CKx,
CLx, CMx, CNx, CPx, CQx, CUx, CXx
• 4179-CTO, GCx, GDx, GEx, GVx, GWx
• 4180-CTO, J4x, MTx, MUx, MVx, MWx, MXx, N3x, N4x, N5x, PJx, PKx, PLx,
PMx, PNx, PPx, PQx, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, NXx, NYx, P7x, P8x, PCx, PDx, PEx, PJx
• 4237-CTO
• 4238-CTO
60Y3241
**
2
Intel Centrino Advanced-N 6205 (2x2 AGN)
• 4177-CTO, 22x, 23x, 24x, 2Nx, 2Px, 35x, Q2x, Q3x, Q4x, Q5x, QHx, QNx,
R8x, RAx, RKx, RLx, RMx, RWx, RXx
• 4178-CTO, 52x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx,
5Gx, 5Hx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx,
5Yx, 5Zx, 68x, 69x, 6Ax, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx, 6Px, 6Qx, 6Rx, 6Sx,
6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 9Dx, 9Ex,
9Qx, 9Rx, 9Zx, A2x, A3x, A4x, A8x, A9x, ABx, ALx, ANx, APx, ASx, ATx, AWx,
AXx, AYx, BGx, BSx, BTx, BYx, BZx, C3x, C4x, C5x, C6x, C7x, C8x, CAx,
CVx, CWx, CYx
• 4179-CTO, GBx, GQx, GRx
• 4180-CTO, 62x, 63x, 64x, 65x, J2x, J3x, K2x, K3x, K4x, K5x, K6x, K7x, K8x,
K9x, KAx, KBx, KCx, KDx, KEx, KFx, KHx, KJx, KKx, KLx, KMx, KNx, KPx,
KQx, KRx, KSx, KTx, KUx, KVx, KWx, L4x, L5x, L6x, L7x, L8x, L9x, LAx, LBx,
LCx, LDx, LLx, LMx, LQx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x, M7x,
M8x, M9x, MBx, MCx, MDx, MEx, MFx, MGx, MHx, MJx, MKx, MLx, MMx,
MNx, MQx, MRx, MSx, MYx, MZx, N2x, N6x, N7x, N8x, N9x, NBx, NCx, NDx,
NEx, PAx, PBx, PCx, PFx, PGx, PHx, PRx, PSx, PUx, PVx, PWx, PXx, PYx,
PZx, Q2x, Q3x, Q4x
• 4236-CTO, 62x, 63x, 64x, 65x, MBx, N2x, N3x, N5x, NAx, NBx, NDx, NEx, NHx,
NMx, NNx, NSx, NTx, NUx, NVx, P3x, P5x, P6x, PAx, PHx, PKx, PLx, PNx, PRx,
PSx, PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
60Y3253
**
Chapter 10. Parts list
131
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
2
Intel Centrino Ultimate-N 6300
• 4177-CTO, 2Hx, 2Jx, Q8x, QFx
• 4178-CTO, 67x, 99x, 9Ax, 9Bx, 9Cx, CBx
• 4179-CTO
• 4180-CTO, KGx, KXx, KYx, KZx, L2x, L3x, M5x, M6x, NAx, NFx, PTx, Q5x
• 4236-CTO, N4x, NFx, NGx, NPx, NQx, NRx, NWx, P2x, P9x, PFx, PGx, PMx
• 4237-CTO
• 4238-CTO
60Y3233
**
2
Intel Centrino Advanced-N + WiMAX 6250, WW SKU
• 4177-CTO, QAx, QBx, QEx, QUx, R7x
• 4178-CTO, 9Px
• 4179-CTO
• 4180-CTO, MPx
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3195
**
2
Intel Centrino Advanced-N + WiMAX 6250, Russia SKU
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3209
**
3
1-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card
• 4177-CTO, 2Fx, Q7x, QAx
• 4178-CTO, 5Lx, 5Mx, 6Tx, 92x, 94x, 96x, 97x, 9Ux, ADx, AKx
• 4179-CTO
• 4180-CTO, N3x, N6x, N7x
• 4236-CTO, P5x, P6x, P7x
• 4237-CTO
• 4238-CTO
55Y3715
**
3
2-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card
• 4177-CTO, 22x, 23x, 24x, 25x, 26x, 28x, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Qx, 2Rx,
2Xx, 36x, GFx, GKx, GLx, GMx, Q2x, Q4x, Q7x, QCx, QEx, QFx, QQx, QRx,
QSx, QTx, R5x, R6x, R9x, RNx, RUx
• 4178-CTO, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Kx,
5Lx, 5Mx, 66x, 6Jx, 6Mx, 6Nx, 6Sx, 6Tx, 83x, 84x, 92x, 94x, 96x, 97x, 98x, 99x,
9Ax, 9Bx, 9Dx, 9Ex, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx, 9Px, 9Qx, 9Ux,
9Vx, A5x, A6x, A7x, AAx, ABx, ADx, AEx, AGx, AJx, AKx, ALx, AQx, ARx, ASx,
AUx, AVx, BBx, BCx, BGx, BKx, CDx, CNx, CYx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GCx, GDx, GEx, GGx,
GHx, GJx, GPx, GQx, GSx, GTx, GUx, GVx, GWx
• 4180-CTO, 62x, 63x, 64x, 65x, J2x, J3x, J4x, K3x, K6x, K7x, KQx, LCx, LDx,
LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx, LNx, LRx, LSx, LTx, LUx, LVx, LWx,
M7x, M8x, M9x, MAx, MCx, MGx, MLx, MPx, MTx, MUx, MVx, MWx, MXx,
MYx, N3x, N6x, N7x, NAx, PDx, PHx, PJx, PKx, PLx, PPx, Q6x, Q7x, Q9x
• 4236-CTO, 62x, 63x, 64x, 65x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NKx, NLx,
NXx, P3x, P4x, P5x, P6x, P7x, PBx, PJx
• 4237-CTO
• 4238-CTO
55Y3716
**
132
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
3
4-GB DDR3-1333 SDRAM SO-DIMM (PC3-10600) card
• 4177-CTO, 27x, 29x, 2Ax, 2Bx, 2Cx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Sx,
2Tx, 2Ux, 2Vx, 2Wx, 2Yx, 32x, 33x, 34x, 35x, Q3x, Q5x, Q8x, QBx, QDx, QFx,
QGx, QHx, QJx, QKx, QLx, QMx, QNx, QPx, QUx, QVx, QWx, QXx, QYx, QZx,
R2x, R3x, R4x, R7x, R8x, RAx, RBx, RCx, RDx, RFx, RGx, RHx, RJx, RKx, RLx,
RMx, RPx, RQx, RRx, RSx, RTx, RVx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 5Jx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx,
5Wx, 5Xx, 5Yx, 5Zx, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx,
6Kx, 6Lx, 6Px, 6Qx, 6Rx, 6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 82x, 93x, 95x, 99x,
9Ax, 9Bx, 9Cx, 9Rx, 9Sx, 9Tx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x, A8x, A9x,
ACx, AEx, AFx, AHx, AMx, ANx, APx, ATx, AWx, AXx, AYx, AZx, B2x, B3x, B4x,
B5x, B6x, B7x, B8x, B9x, BAx, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx,
BRx, BSx, BTx, BUx, BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, C5x, C6x, C7x,
C8x, C9x, CAx, CBx, CCx, CEx, CFx, CGx, CHx, CJx, CKx, CLx, CMx, CPx,
CQx, CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, GBx, GMx, GNx, GRx, GXx
• 4180-CTO, K2x, K4x, K5x, K8x, K9x, KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx,
KJx, KKx, KLx, KMx, KNx, KPx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx,
KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x, L9x, LAx, LBx, LPx, LQx, LXx, LYx, LZx,
M2x, M3x, M4x, M5x, M6x, MBx, MDx, MEx, MFx, MHx, MJx, MKx, MMx,
MNx, MQx, MRx, MSx, MZx, N2x, N4x, N5x, N8x, N9x, NBx, NCx, NDx, NEx,
NFx, PAx, PBx, PCx, PEx, PFx, PGx, PMx, PNx, PQx, PRx, PSx, PTx, PUx,
PVx, PWx, PXx, PYx, PZx, Q2x, Q3x, Q4x, Q5x, Q8x
• 4236-CTO, MBx, N2x, N3x, N4x, N5x, NDx, NEx, NFx, NGx, NHx, NMx, NNx,
NPx, NQx, NRx, NSx, NTx, NUx, NVx, NWx, NYx, P2x, P8x, P9x, PAx, PCx,
PDx, PEx, PFx, PGx, PHx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx, PTx, PUx,
PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
55Y3717
**
4
Keyboard bezel assembly with fingerprint reader
• 4177-CTO, 22x, 23x, 24x, 27x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx,
2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 2Xx, 2Yx,
32x, 33x, 34x, 35x, 36x, GFx, GKx, GLx, GMx, Q2x, Q3x, Q4x, Q7x, Q8x, QAx,
QBx, QCx, QEx, QHx, QNx, QPx, QQx, QRx, QTx, QUx, QVx, QWx, QXx, QYx,
QZx, R4x, R5x, R6x, R7x, R8x, R9x, RAx, RBx, RCx, RDx, RFx, RGx, RHx, RJx,
RKx, RLx, RMx, RNx, RPx, RQx, RRx, RSx, RTx, RUx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx,
5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx,
66x, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx,
6Mx, 6Nx, 6Px, 6Qx, 6Rx, 6Sx, 6Tx, 6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 82x, 83x,
84x, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, 9Jx, 9Kx,
9Lx, 9Mx, 9Px, 9Qx, 9Sx, 9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x,
A8x, A9x, ABx, ADx, AEx, AFx, AGx, AHx, AJx, AKx, ALx, AMx, ANx, APx, ASx,
ATx, AUx, AVx, AWx, AXx, AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B8x, B9x,
BAx, BBx, BCx, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx, BPx, BQx,
BRx, BSx, BTx, BUx, BYx, BZx, C2x, C3x, C4x, C5x, C6x, C7x, C8x, C9x, CAx,
CBx, CCx, CDx, CEx, CFx, CGx, CHx, CJx, CKx, CLx, CMx, CNx, CPx, CQx,
CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GBx, GCx, GDx, GGx, GHx,
GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, 63x, 65x, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x,
KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KPx,
KQx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x,
L7x, L8x, L9x, LAx, LBx, LCx, LDx, LNx, LPx, LQx, LRx, LSx, LTx, LUx, LVx,
LWx, LXx, LYx, LZx, M2x, M3x, M4x, M5x, M6x, M7x, M8x, MAx, MBx, MCx,
MDx, MEx, MFx, MGx, MHx, MJx, MKx, MMx, MNx, MPx, MQx, MRx, MSx,
MTx, MUx, MVx, MWx, MXx, MYx, MZx, N2x, N3x, N4x, N5x, N6x, N7x, N8x,
04W1371
N
Chapter 10. Parts list
133
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
N9x, NAx, NBx, NFx, PAx, PBx, PCx, PFx, PGx, PHx, PKx, PLx, PMx, PNx,
PPx, PQx, PRx, PSx, PTx, PUx, PVx, PWx, PXx, PYx, PZx, Q3x, Q4x, Q5x,
Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 63x, MBx, N2x, N3x, N4x, N5x, N8x, N9x, NAx, NBx, NCx, NDx,
NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx, NTx, NUx,
NVx, NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx, PBx, PCx,
PDx, PEx, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx,
PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
4
Keyboard bezel assembly without fingerprint reader
• 4177-CTO, 25x, 26x, 28x, Q5x, QDx, QFx, QGx, QJx, QKx, QLx, QMx, QSx,
R2x, R3x, RVx
• 4178-CTO, 56x, 57x, 58x, 59x, 9Fx, 9Gx, 9Hx, 9Nx, 9Rx, A5x, A6x, A7x, AAx,
ACx, AQx, ARx, BVx, BWx, BXx
• 4179-CTO, G2x, GEx
• 4180-CTO, 62x, 64x, LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx, M9x, MLx, NCx,
NDx, NEx, PDx, PEx, PJx, Q2x
• 4236-CTO, 62x, 64x, 65x, N6x, N7x
• 4237-CTO
• 4238-CTO
04W1372
N
5
Modem daughter card (MDC)
• 4177-CTO, 22x, 23x, 24x, 25x, 29x, 2Ax, 2Bx, 2Cx, 2Ex, 2Jx, 2Xx, 36x, GFx,
GKx, GLx, GMx, Q4x, Q7x, QAx, QCx, QPx, QQx, QRx, QSx, R9x, RBx, RCx,
RFx
• 4178-CTO, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx,
5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx, 66x, 67x, 68x, 69x,
6Ax, 6Hx, 6Jx, 6Kx, 6Lx, 6Qx, 6Rx, 6Sx, 6Tx, 6Xx, 6Yx, 6Zx, 82x, 83x, 84x, 92x,
93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, A5x, A6x, A7x, AJx,
AKx, AQx, ARx, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx, BRx, BUx,
BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, CBx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GCx, GDx, GGx, GHx,
GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx,
KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KPx, KQx, KRx,
KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x,
L9x, LAx, LBx, LCx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx, LNx, LPx,
LQx, LRx, LSx, LTx, LYx, LZx, M2x, M3x, M4x, M5x, M6x, M9x, MAx, MBx,
MCx, MDx, MEx, MFx, MGx, MQx, MRx, MSx, MTx, MUx, MVx, MWx, MXx,
MZx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NCx, NFx, PDx, PKx, PLx,
PMx, PNx, PPx, PQx, PSx, PXx, Q3x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, MBx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx,
NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx, NTx,
NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P8x, P9x, PBx, PCx, PDx, PEx,
PHx, PJx
• 4237-CTO
• 4238-CTO
60Y3207
N
6
Speaker assembly
04W1633
04W1634
N
7
Magnesium structure frame assembly
04W1629
N
134
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
8
DVD-RAM/RW drive
• 4177-CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex,
2Fx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx,
2Wx, 2Xx, 2Yx, 32x, 33x, 34x, 35x, 36x, GFx, GKx, GLx, GMx, Q2x, Q3x, Q4x,
Q5x, Q8x, QAx, QBx, QCx, QEx, QGx, QHx, QJx, QKx, QLx, QMx, QNx, QPx,
QQx, QRx, QSx, QTx, QUx, QVx, QWx, QXx, QYx, QZx, R2x, R3x, R4x, R5x,
R6x, R7x, R8x, R9x, RAx, RBx, RCx, RDx, RFx, RGx, RHx, RJx, RKx, RLx, RMx,
RNx, RPx, RQx, RRx, RSx, RTx, RUx, RVx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex,
5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx,
5Wx, 5Xx, 5Yx, 5Zx, 66x, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx,
6Hx, 6Jx, 6Kx, 6Lx, 6Mx, 6Nx, 6Px, 6Qx, 6Rx, 6Sx, 6Tx, 6Ux, 6Vx, 6Wx, 6Xx,
6Yx, 6Zx, 82x, 83x, 84x, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx,
9Dx, 9Ex, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx, 9Px, 9Qx, 9Rx, 9Sx, 9Tx,
9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x, A5x, A6x, A7x, A8x, A9x, AAx,
ABx, ACx, ADx, AEx, AFx, AGx, AHx, AJx, AKx, ALx, AMx, ANx, APx, AQx, ARx,
ASx, ATx, AUx, AVx, AWx, AXx, AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B8x,
B9x, BAx, BBx, BCx, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx, BPx,
BQx, BRx, BSx, BTx, BUx, BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, C5x,
C6x, C7x, C8x, C9x, CAx, CBx, CCx, CDx, CEx, CFx, CGx, CHx, CJx, CKx,
CLx, CMx, CNx, CPx, CQx, CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GBx, GCx, GDx, GEx,
GGx, GHx, GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, 62x, 63x, 64x, 65x, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x,
K8x, K9x, KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx,
KPx, KQx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x,
L6x, L7x, L8x, L9x, LAx, LBx, LCx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LLx,
LMx, LNx, LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x, M5x,
M6x, M7x, M8x, M9x, MAx, MBx, MCx, MDx, MEx, MFx, MGx, MHx, MJx,
MKx, MLx, MMx, MNx, MPx, MQx, MRx, MSx, MTx, MUx, MVx, MWx, MXx,
MYx, MZx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NDx,
NEx, NFx, PAx, PBx, PCx, PDx, PEx, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx,
PPx, PQx, PRx, PSx, PTx, PUx, PVx, PWx, PXx, PYx, PZx, Q2x, Q3x, Q4x, Q5x,
Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 62x, 63x, 64x, 65x, MBx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x,
NAx, NBx, NCx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx,
NTx, NUx, NVx, NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx,
PBx, PCx, PDx, PEx, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx, PQx, PRx,
PSx, PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
75Y5115
75Y5113
75Y5111
*
8
DVD-ROM drive
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
75Y5117
*
Chapter 10. Parts list
135
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
8
Travel Bezel
• 4177-CTO, Q7x, QDx, QFx
• 4178-CTO
• 4179-CTO
• 4180-CTO, LPx, LQx
• 4236-CTO, NDx, NEx
• 4237-CTO
• 4238-CTO
60Y5512
*
9
Audio sub card
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1623
N
10
Audio sub card cable
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1624
N
11
DC-in cable
04W1635
N
12
I/O sub card (USB only)
• 4177-CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex,
2Jx, 2Xx, 32x, 33x, 34x, 36x, GFx, GKx, GLx, GMx, Q2x, Q3x, Q4x, Q5x, Q7x,
QAx, QCx, QDx, QFx, QGx, QJx, QKx, QLx, QPx, QQx, QRx, QSx, QTx, QUx,
QVx, QWx, QXx, QYx, QZx, R2x, R3x, R5x, R6x, R7x, R9x, RBx, RCx, RFx,
RGx, RHx, RJx, RNx, RPx, RVx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex,
5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx,
5Wx, 5Xx, 5Yx, 5Zx, 66x, 67x, 68x, 69x, 6Ax, 6Hx, 6Jx, 6Kx, 6Lx, 6Qx, 6Rx,
6Sx, 6Tx, 6Xx, 6Yx, 6Zx, 82x, 83x, 84x, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x,
9Ax, 9Bx, 9Cx, 9Dx, 9Ex, 9Px, 9Qx, 9Rx, A5x, A6x, A7x, AAx, ABx, ACx, AGx,
AHx, AJx, AKx, ALx, AMx, ANx, APx, AQx, ARx, ASx, AUx, AVx, B5x, B6x, B7x,
B8x, B9x, BAx, BBx, BCx, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx,
BRx, BUx, BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, CBx, CCx, CDx, CHx,
CJx, CRx, CSx, CUx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GCx, GDx, GGx, GHx,
GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx,
KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KPx, KQx, KRx, KSx,
KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x, L9x,
LAx, LBx, LCx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx, LNx, LPx, LQx,
LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x, M5x, M6x, M7x,
M8x, M9x, MAx, MBx, MCx, MDx, MEx, MFx, MGx, MLx, MPx, MQx, MRx,
MSx, MTx, MUx, MVx, MWx, MXx, MYx, MZx, N2x, N3x, N4x, N5x, N6x, N7x,
N8x, N9x, NAx, NBx, NCx, NFx, PAx, PDx, PEx, PFx, PGx, PHx, PJx, PKx, PLx,
PMx, PNx, PPx, PQx, PSx, PTx, PXx, Q2x, Q3x, Q4x, Q5x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, MBx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx,
NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx, NTx,
NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P8x, P9x, PAx, PBx, PCx, PDx, PEx,
PFx, PGx, PHx, PJx, PLx, PPx, PQx
• 4237-CTO
• 4238-CTO
04W1630
N
136
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
12
I/O sub card (1394 and USB)
• 4177-CTO, 2Fx, 2Gx, 2Hx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux,
2Vx, 2Wx, 2Yx, 35x, Q8x, QBx, QEx, QHx, QMx, QNx, R4x, R8x, RAx, RDx,
RKx, RLx, RMx, RQx, RRx, RSx, RTx, RUx, RWx, RXx
• 4178-CTO, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Mx, 6Nx, 6Px, 6Ux, 6Vx, 6Wx, 9Fx,
9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx, 9Sx, 9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx,
A2x, A3x, A4x, A8x, A9x, ADx, AEx, AFx, ATx, AWx, AXx, AYx, AZx, B2x, B3x,
B4x, BGx, BKx, BSx, BTx, C5x, C6x, C7x, C8x, C9x, CAx, CEx, CFx, CGx, CKx,
CLx, CMx, CNx, CPx, CQx, CVx, CWx, CXx, CYx
• 4179-CTO, GBx, GEx
• 4180-CTO, 62x, 63x, 64x, 65x, MHx, MJx, MKx, MMx, MNx, NDx, NEx, PBx,
PCx, PRx, PUx, PVx, PWx, PYx, PZx
• 4236-CTO, 62x, 63x, 64x, 65x, NUx, NVx, P7x, PKx, PMx, PNx, PRx, PSx,
PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
04W1631
N
—
RJ11 cable with connector
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1632
N
13
Battery pack, Li-ion (4-cell) 55
• 4177-CTO, 2Dx, GFx, GKx, QDx, QEx, QMx, RRx, RSx, RTx, RUx
• 4178-CTO, 66x, 67x, 68x, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx, A5x, A6x,
A7x, AAx, AGx, BUx, BVx, BWx, BXx, CKx, CLx, CMx, CNx, CPx, CQx
• 4179-CTO
• 4180-CTO, PJx
• 4236-CTO
• 4237-CTO
• 4238-CTO
42T4883
42T4885
*
13
Battery pack, Li-ion (6-cell) 55+
• 4177-CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Ex, 2Fx,
2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx,
2Xx, 2Yx, 32x, 33x, 34x, 35x, 36x, GLx, GMx, Q2x, Q5x, Q8x, QAx, QCx, QGx,
QHx, QJx, QKx, QLx, QNx, QPx, QQx, QRx, QSx, QTx, QUx, QVx, QWx, QXx,
QYx, QZx, R2x, R3x, R4x, R5x, R6x, R7x, R8x, R9x, RAx, RBx, RCx, RDx, RFx,
RGx, RHx, RJx, RKx, RLx, RMx, RNx, RPx, RQx, RVx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 56x, 57x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx,
5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx,
5Xx, 5Yx, 5Zx, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx,
6Mx, 6Nx, 6Qx, 6Rx, 6Sx, 6Tx, 6Ux, 6Xx, 6Yx, 6Zx, 82x, 83x, 84x, 92x, 93x,
94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, 9Px, 9Qx, 9Rx, 9Sx,
9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A8x, A9x, ABx, ACx, ADx, AEx,
AFx, AHx, AJx, AKx, ALx, AMx, ANx, APx, AQx, ARx, ASx, ATx, AUx, AVx, AWx,
AXx, AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B8x, B9x, BAx, BBx, BCx, BDx,
BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx, BPx, BQx, BRx, BSx, BTx, BYx,
BZx, C2x, C3x, C4x, C7x, C8x, C9x, CBx, CCx, CDx, CEx, CFx, CGx, CHx,
CJx, CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GBx, GCx, GDx, GEx,
GGx, GHx, GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, 62x, 63x, 64x, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x,
K9x, KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx,
KPx, KQx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx, L2x, L3x, L4x, L5x, L6x,
42T4791
42T4793
42T4795
42T4911
*
Chapter 10. Parts list
137
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
L7x, L8x, L9x, LAx, LBx, LCx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx,
LNx, LPx, LQx, LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x,
M5x, M6x, M7x, M8x, M9x, MBx, MCx, MDx, MEx, MGx, MHx, MJx, MKx,
MLx, MNx, MPx, MQx, MRx, MSx, MTx, MUx, MVx, MWx, MXx, MYx, MZx,
N2x, N3x, N4x, N5x, N6x, N7x, N8x, NBx, NCx, NDx, NEx, NFx, PAx, PBx, PCx,
PDx, PEx, PFx, PGx, PHx, PKx, PLx, PMx, PNx, PPx, PQx, PTx, PUx, PVx,
PWx, PXx, PYx, PZx, Q2x, Q3x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 62x, 63x, 64x, MBx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx,
NBx, NCx, NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx,
NSx, NTx, NUx, NWx, NXx, NYx, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx,
PBx, PCx, PDx, PEx, PGx, PHx, PJx, PLx, PMx, PPx, PQx, PSx, PTx, PUx,
PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
13
Battery pack, Li-ion (6-cell) 26+
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
42T4817
42T4819
*
13
Battery pack, Li-ion (9-cell) 55++
• 4177-CTO, Q3x, Q4x, Q7x, QBx, QFx
• 4178-CTO, 58x, 6Px, 6Vx, 6Wx, A4x, C5x, C6x, CAx
• 4179-CTO
• 4180-CTO, 65x, KZx, MAx, MFx, MMx, N9x, NAx, PRx, PSx, Q4x, Q5x
• 4236-CTO, 65x, NVx, P2x, PFx, PKx, PNx, PRx
• 4237-CTO
• 4238-CTO
42T4799
42T4801
42T4912
*
14
Base cover assembly
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1626
N
14
Base cover assembly (Taiwan 90 W)
• 4177-CTO, RRx, RSx, RTx, RUx
• 4178-CTO, 5Fx, 5Hx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx, A5x, A6x, A7x, BUx, BVx,
BXx, CKx, CLx, CMx, CNx, CPx, CQx
• 4179-CTO
• 4180-CTO, 64x, 65x, MMx
• 4236-CTO, 64x, 65x, NVx, PRx
• 4237-CTO
• 4238-CTO
04W1627
N
14
Base cover assembly (Taiwan 65 W)
• 4177-CTO, QMx
• 4178-CTO, 5Bx, 5Dx, 5Kx, 66x, 67x, 68x, 9Fx, 9Gx, BWx
• 4179-CTO
• 4180-CTO, 62x, 63x, MBx, MNx, PAx
• 4236-CTO, 62x, 63x, MBx, NHx, NUx, PAx
• 4237-CTO
• 4238-CTO
04W1628
N
138
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
15
Slice battery
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
42T4739
*
16
DIMM slot door
04W1636
**
17
Integrated Mobile Broadband (Gobi 3000 3G with GPS)
• 4177-CTO
• 4178-CTO, APx
• 4179-CTO
• 4180-CTO, PFx
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3257
**
17
Integrated Mobile Broadband (Gobi 3000 3G with GPS for Malaysia)
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3283
**
17
Integrated Mobile Broadband (Ericsson F5521gw)
• 4177-CTO, Q7x, QFx
• 4178-CTO, 54x, 55x, 5Ax, 5Cx, 5Ex, 5Gx, 5Tx, 6Px, 6Yx, 82x, 94x, 99x, AMx,
ANx, B6x, B8x, BHx, BJx, BMx, BNx, BRx, C2x, C6x, CHx, CSx
• 4179-CTO
• 4180-CTO, K9x, KAx, KBx, KCx, KFx, KJx, KMx, KNx, KSx, KUx, KVx, KYx,
KZx, L2x, L4x, L8x, LBx, LHx, LJx, LKx, M5x, MDx, MFx, PBx, PTx
• 4236-CTO, N2x, N4x, NAx, NBx, NFx, NGx, NMx, NNx, P2x, P3x, PFx, PGx,
PQx
• 4237-CTO
• 4238-CTO
60Y3279
**
17
Integrated Mobile Broadband (Ericsson F5521gw for Malaysia)
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3267
**
17
Integrated China Telecom Mobile Broadband TD-SCDMA (Leadcore LC5740)
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3261
**
Chapter 10. Parts list
139
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
17
Integrated China Telecom Mobile Broadband (Huawei EM660)
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
60Y3239
**
—
mSATA Solida State Drive
• 4177-CTO, Q3x, QAx, QCx
• 4178-CTO, 5Ux, 67x, 68x, 6Ax, 9Cx, A8x, A9x, AXx
• 4179-CTO
• 4180-CTO, M6x, PYx
• 4236-CTO
• 4237-CTO
• 4238-CTO
45N8259
**
18
HDD rubber rails
41V9756
**
18
HDD rubber rails (7.0 mm-high HDD rubber rails for 9.5 mm-high bay)
04W1640
**
18
SSD spacers
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1641
**
19
SATA hard disk drive, 250 GB, 5,400 rpm
• 4177-CTO, 26x, GKx, QAx, QCx
• 4178-CTO, 6Tx, AJx
• 4179-CTO
• 4180-CTO, K3x, K4x, KQx, MFx, MVx, MWx, PDx
• 4236-CTO, N5x, P4x
• 4237-CTO
• 4238-CTO
45N7217
45N7229
45N7305
45N7285
42T1153
42T1167
**
19
SATA hard disk drive, 320 GB, 5,400 rpm
• 4177-CTO, 22x, 25x, 28x, 2Dx, 2Ex, GLx, GMx, QDx, QNx, QQx, QRx, QSx,
QUx, R7x, RNx
• 4178-CTO, 5Ax, 5Bx, 5Cx, 5Dx, 9Vx, AAx, ABx, AGx, AQx, ARx, CDx
• 4179-CTO, G2x, G4x, G5x, G6x, G7x, G8x, G9x
• 4180-CTO, KWx, LEx, LNx, LUx, M7x, MAx, PJx, Q2x
• 4236-CTO, N2x, N6x, NCx, NXx, NYx, PCx, PDx, PEx
• 4237-CTO
• 4238-CTO
45N7219
45N7297
45N7315
45N7307
45N7287
42T1155
**
19
SATA hard disk drive, 500 GB, 5,400 rpm
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
45N7221
45N7309
**
140
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
19
SATA hard disk drive, 160 GB, 7200 rpm
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
45N7251
45N7271
45N7317
45N7323
42T1157
42T1169
**
19
SATA hard disk drive, 250 GB, 7200 rpm
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
42T1163
42T1173
**
19
SATA hard disk drive, 320 GB, 7200 rpm
• 4177-CTO, 23x, 29x, 2Ax, 2Fx, 36x, GFx, Q2x, Q4x, Q5x, QGx, QJx, QKx,
QLx, QTx, R2x, R3x, R5x, R6x, RVx
• 4178-CTO, 52x, 53x, 54x, 56x, 58x, 59x, 5Ex, 5Fx, 5Gx, 5Hx, 5Kx, 6Hx, 6Jx,
83x, 84x, 9Ex, 9Px, 9Qx, 9Rx, 9Ux, 9Wx, 9Xx, 9Yx, ACx, ADx, AKx, AMx, ANx,
APx, AUx, AVx, B3x, B4x, B5x, B6x, BAx, BBx, BCx, CRx, CSx
• 4179-CTO, GCx, GEx, GGx, GHx, GQx, GSx, GTx, GVx
• 4180-CTO, 62x, 63x, 64x, K2x, K6x, K7x, K8x, K9x, KCx, KEx, KFx, KHx, KJx,
KLx, KMx, KPx, KRx, KSx, KTx, KUx, KYx, L2x, L9x, LAx, LCx, LDx, LVx, LWx,
M9x, MBx, MCx, MGx, MJx, MLx, MPx, MSx, MXx, MYx, MZx, NBx, NCx, NDx,
NEx, PBx, PCx, PEx, PFx, PHx, PKx, PPx, Q6x
• 4236-CTO, 62x, 63x, 64x, MBx, N3x, N4x, NHx, NKx, NLx, NNx, P3x
• 4237-CTO
• 4238-CTO
45N7255
45N7275
45N7319
45N7325
42T1159
42T1171
**
19
SATA hard disk drive, 500 GB, 7200 rpm
• 4177-CTO, 24x, 27x, 2Bx, 2Cx, 2Gx, 2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px,
2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 2Xx, 2Yx, 32x, 33x, 34x, 35x, Q3x, QBx,
QHx, QMx, QPx, QVx, QWx, QXx, QYx, QZx, R4x, R8x, R9x, RAx, RBx, RCx,
RDx, RFx, RGx, RHx, RJx, RKx, RLx, RMx, RPx, RQx, RRx, RSx, RTx, RUx,
RWx, RYx, RZx
• 4178-CTO, 55x, 57x, 5Jx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx,
5Yx, 5Zx, 66x, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Kx, 6Lx, 6Mx,
6Nx, 6Qx, 6Rx, 6Sx, 6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 82x, 92x, 93x, 94x, 95x,
96x, 97x, 98x, 9Ax, 9Bx, 9Cx, 9Dx, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Nx,
9Sx, 9Tx, 9Zx, A2x, A3x, A4x, A5x, A6x, A7x, A8x, A9x, AFx, AHx, ALx, ASx,
AXx, AYx, AZx, B2x, B8x, B9x, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BPx, BQx,
BRx, BSx, BTx, BUx, BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, C5x, C7x, C8x,
C9x, CAx, CBx, CCx, CEx, CFx, CGx, CHx, CJx, CKx, CLx, CMx, CNx, CPx,
CQx, CVx, CWx, CXx, CYx
• 4179-CTO, G3x, GBx, GDx, GJx, GMx, GNx, GPx, GRx, GUx, GWx, GXx
• 4180-CTO, 65x, J2x, J3x, J4x, K5x, KDx, KGx, KKx, KNx, KVx, KXx, KZx, LBx,
LFx, LGx, LHx, LJx, LKx, LLx, LMx, LPx, LQx, LRx, LSx, LTx, LXx, LYx, LZx,
M2x, M3x, M4x, M5x, M6x, M8x, MHx, MKx, MMx, MNx, MRx, MTx, MUx, N2x,
N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, PGx, PLx, PMx, PNx, PQx, PRx, PSx,
PTx, PUx, PVx, PXx, PYx, Q3x, Q4x, Q5x, Q7x, Q8x, Q9x
• 4236-CTO, 65x, N7x, N8x, N9x, NAx, NBx, NDx, NEx, NFx, NGx, NPx, NQx,
NRx, NUx, NVx, NWx, P2x, P5x, P6x, P7x, P8x, P9x, PFx, PGx, PHx, PJx, PKx,
PLx, PMx, PNx, PPx, PQx, PRx, PSx, PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
45N7257
45N7277
45N7321
**
Chapter 10. Parts list
141
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
19
Solid state drive, 128 GB
• 4177-CTO, Q7x
• 4178-CTO, 5Rx, ATx, B7x, CUx
• 4179-CTO
• 4180-CTO, KAx, L3x, L6x, L7x, PAx
• 4236-CTO, NMx, PAx, PBx
• 4237-CTO
• 4238-CTO
45N8081
45N8007
45N7981
**
19
Solid state drive, 160 GB
• 4177-CTO, Q8x, QEx, QFx, RXx
• 4178-CTO, 5Sx, 6Gx, 6Px, 99x, AEx, AWx, BMx, BNx, C6x
• 4179-CTO
• 4180-CTO, KBx, L4x, L5x, L8x, MDx, MEx, MQx, NFx, PWx, PZx
• 4236-CTO, NSx, NTx
• 4237-CTO
• 4238-CTO
45N8057
**
19
Solid state flash drive, 4 GB
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
45N8085
20
HDD cover
04W1637
**
21
System board assembly, integrated graphics, AMT, TPM
• 4177-CTO, Q2x, Q5x, Q8x, QAx, QNx, RMx
• 4178-CTO, 52x, 56x, 57x, 59x, 5Ax, 5Bx, 5Vx, 5Wx, 5Xx, 67x, 68x, 6Fx, 6Gx,
6Qx, 6Ux, 6Zx, 9Bx, 9Cx, 9Px, 9Qx, ABx, ALx, ANx, APx, ASx, ATx, AWx,
AYx, C8x
• 4179-CTO, GBx, GQx, GRx
• 4180-CTO, 62x, 63x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx, KCx,
KDx, KEx, KFx, KGx, KHx, KJx, KKx, LDx, LUx, LWx, M2x, M7x, M8x, M9x,
MBx, MDx, MEx, MJx, MLx, MNx, MPx, MQx, MSx, MYx, N2x, NBx, NDx, NFx,
PAx, PBx, PCx, PFx, PGx, PHx, PVx, PXx, Q2x, Q3x
• 4236-CTO, 62x, 63x, MBx, N2x, N3x, N5x, NGx, NHx, NMx, NNx, NTx, NUx,
P3x, P5x, P9x, PAx, PGx, PLx, PMx, PXx
• 4237-CTO
• 4238-CTO
04W2045
N
21
System board assembly, integrated graphics, AMT, non-TPM
• 4177-CTO, 2Hx
• 4178-CTO
• 4179-CTO
• 4180-CTO, MCx
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W2046
N
142
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
21
System board assembly, integrated graphics, non-AMT, TPM
• 4177-CTO, 25x, 26x, 27x, 28x, 29x, 2Dx, 2Ex, 2Qx, 2Rx, 2Sx, 35x, 36x, GKx,
GMx, Q7x, QCx, QDx, QGx, QJx, QKx, QLx, QMx, QQx, QSx, QTx, QUx, QVx,
R2x, R3x, R5x, R6x, R7x, R8x, R9x, RBx, RFx, RGx, RNx, RPx, RRx, RSx,
RVx, RYx
• 4178-CTO, 53x, 5Cx, 5Dx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Rx, 5Tx, 5Ux, 66x,
69x, 6Bx, 6Cx, 6Dx, 6Ex, 6Hx, 6Jx, 6Kx, 6Lx, 6Mx, 6Nx, 83x, 84x, 92x, 93x,
95x, 96x, 97x, 98x, 9Fx, 9Gx, 9Rx, 9Zx, A7x, A8x, AAx, ACx, AFx, AGx, AHx,
AMx, ARx, AUx, AVx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B9x, BAx, BBx, BCx,
BDx, BEx, BGx, BJx, BKx, BMx, BNx, BPx, BSx, BWx, BYx, C2x, C3x, C9x,
CBx, CCx, CDx, CEx, CFx, CJx, CKx, CLx, CRx, CSx, CUx, CWx, CXx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, GEx, GGx, GSx
• 4180-CTO, LEx, LFx, LGx, LHx, LJx, LKx, LNx, LPx, LRx, LSx, LTx, MUx, MVx,
MWx, NCx, PDx, PEx, PJx
• 4236-CTO, N6x, N7x, N8x, NCx, NKx, NLx, NXx, NYx, P4x, P6x, P7x, P8x, PBx,
PCx, PDx, PEx, PHx, PJx, PPx, PQx, PSx, PTx, PUx, PVx
• 4237-CTO
• 4238-CTO
04W2047
N
21
System board assembly, integrated graphics, non-AMT, non-TPM
• 4177-CTO, 2Fx, 2Gx
• 4178-CTO, 6Tx, 9Vx, 9Wx, 9Yx, ADx, AJx, AKx
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W2048
N
21
System board assembly, discrete graphics, AMT, TPM
• 4177-CTO, 2Jx, 2Nx, 2Px, Q3x, Q4x, QBx, QFx, RKx, RLx
• 4178-CTO, 54x, 55x, 58x, 5Ex, 5Fx, 5Yx, 5Zx, 6Ax, 6Px, 6Rx, 6Vx, 6Wx, 6Xx,
6Yx, 99x, 9Ax, A3x, A4x, A9x, C5x, C6x, C7x, CAx
• 4179-CTO
• 4180-CTO, 64x, 65x, J2x, J3x, KLx, KMx, KNx, KPx, KQx, KRx, KSx, KTx,
KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x, L9x, LAx,
LBx, LCx, LLx, LMx, LQx, LVx, LXx, LYx, LZx, M4x, M5x, M6x, MFx, MGx,
MHx, MKx, MMx, MRx, N6x, N7x, N8x, N9x, NAx, NEx, PRx, PSx, PTx, PUx,
PWx, PYx, PZx, Q4x, Q5x
• 4236-CTO, 64x, 65x, N4x, NAx, NBx, NDx, NEx, NFx, NPx, NQx, NRx, NSx,
NVx, NWx, P2x, PFx, PKx, PNx, PRx, PYx
• 4237-CTO
• 4238-CTO
04W2049
N
21
System board assembly, discrete graphics, AMT, non-TPM
• 4177–CTO
• 4178–CTO, AXx
• 4179–CTO
• 4180–CTO, MZx
• 4236–CTO
• 4237–CTO
• 4238–CTO
04W2050
N
Chapter 10. Parts list
143
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
21
System board assembly, discrete graphics, non-AMT, TPM
• 4177-CTO, 22x, 23x, 24x, 2Ax, 2Bx, 2Cx, 2Kx, 2Lx, 2Mx, 2Tx, 2Ux, 2Vx, 2Wx,
2Xx, 2Yx, 32x, 33x, 34x, GFx, GLx, QEx, QHx, QPx, QRx, QWx, QXx, QYx, QZx,
R4x, RAx, RCx, RDx, RHx, RJx, RQx, RTx, RUx, RWx, RXx, RZx
• 4178-CTO, 5Gx, 5Hx, 5Qx, 5Sx, 6Sx, 82x, 94x, 9Dx, 9Ex, 9Hx, 9Jx, 9Kx, 9Lx,
9Mx, 9Nx, A2x, A5x, A6x, AQx, B8x, BFx, BHx, BQx, BRx, BTx, BUx, BVx, BXx,
BZx, C4x, CGx, CHx, CMx, CNx, CPx, CQx, CVx, CYx
• 4179-CTO, G9x, GCx, GDx, GHx, GJx, GMx, GNx, GPx, GTx, GUx, GVx, GWx,
GXx
• 4180-CTO, J4x, M3x, MAx, MTx, MXx, N3x, N4x, N5x, PKx, PLx, PMx, PNx,
PPx, PQx, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, N9x, PWx
• 4237-CTO
• 4238-CTO
04W2051
N
21
System board assembly, discrete graphics, non-AMT, non-TPM
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO, 9Sx, 9Tx, 9Ux, 9Xx, AEx
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W2052
N
22
CPU assembly, i5-2520M (2.50 GHz)
• 4177-CTO, 2Fx, 2Nx, Q5x, Q8x, QNx
• 4178-CTO, 52x, 56x, 58x, 5Ax, 5Bx, 5Ex, 5Fx, 5Vx, 5Zx, 68x, 6Fx, 6Qx, 6Ux,
6Vx, 6Xx, 6Yx, 6Zx, 9Ax, 9Bx, 9Cx, 9Kx, 9Px, 9Qx, 9Tx, 9Wx, A3x, A9x, AAx,
ABx, ACx, ALx, ANx, APx, ASx, C6x
• 4179-CTO, G2x, G3x, G4x, GBx, GEx, GQx
• 4180-CTO, 62x, 64x, J2x, J3x, K2x, K3x, K4x, K6x, K7x, K8x, KPx, KQx, KRx,
KSx, L6x, L7x, L8x, LEx, LFx, LGx, LHx, LNx, LUx, LVx, LWx, LXx, LYx, M2x,
M7x, M8x, M9x, MCx, MDx, MEx, MGx, MHx, MJx, MLx, MNx, MPx, MSx, MYx,
MZx, N6x, N7x, N8x, NBx, PAx, PBx, PCx, PDx, PEx, PFx, PHx, PJx, PVx, PWx
• 4236-CTO, 62x, 64x, N3x, N6x, N7x, N8x, N9x, NCx, NMx, NNx, NUx, P3x,
P4x, PAx, PBx
• 4237-CTO
• 4238-CTO
04W0492
N
22
CPU assembly, i5-2540M (2.60 GHz)
• 4177-CTO, 2Gx, 2Px, Q2x, Q3x, Q4x, QLx, RLx, RMx
• 4178-CTO, 54x, 55x, 57x, 59x, 5Wx, 6Px, 6Rx, 9Lx, ATx, BEx, BNx, C7x, C8x
• 4179-CTO
• 4180-CTO, 63x, 65x, K5x, K9x, KAx, KEx, KFx, KHx, KJx, KKx, KLx, KMx,
KNx, KTx, KUx, KVx, KWx, L5x, L9x, LAx, LBx, LCx, LDx, LJx, LKx, LLx, LMx,
LZx, M4x, MBx, MKx, MQx, NDx, NEx
• 4236-CTO, 63x, 65x, MBx, N2x, N5x, NAx, NBx, NHx, NSx, NTx, P5x, PCx, PDx
• 4237-CTO
• 4238-CTO
04W0493
N
144
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
22
CPU assembly, i7-2620M (2.70 GHz)
• 4177-CTO, 2Hx, 2Jx, Q7x, QAx, QBx, QFx
• 4178-CTO, 5Xx, 5Yx, 67x, 6Ax, 6Gx, 6Wx, 99x, 9Mx, 9Sx, A4x, AEx, AFx, AWx,
AXx, AYx
• 4179-CTO, GRx
• 4180-CTO, J2x, K8x, KCx, KFx, KMx, KRx, L2x, LAx, LBx, PEx, PJx, PQx,
PXx, Q5x, Q6x
• 4236-CTO, N4x, NDx, NEx, NFx, NGx, NPx, NQx, NRx, NVx, NWx, P2x, P9x,
PEx, PKx
• 4237-CTO
• 4238-CTO
04W0494
N
22
CPU assembly, i3-2310M (2.10 GHz)
• 4177-CTO, 22x, 23x, 24x, 26x, 28x, 29x, 2Ax, 2Bx, 2Dx, 2Ex, 2Qx, 2Rx, 2Sx,
2Tx, 2Ux, 2Xx, 2Yx, QCx, QDx, QGx, QMx, QTx, QUx
• 4178-CTO, 5Cx, 5Dx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 6Bx, 6Cx, 6Hx, 6Jx, 6Mx,
6Nx, 6Tx, 84x, 98x, 9Fx, 9Gx, 9Hx, 9Nx, 9Ux, 9Vx, A5x, A6x, A7x, ADx, AGx,
AJx, AKx, AUx, AVx
• 4179-CTO, G5x, G6x, G8x, G9x, GCx, GDx
• 4180-CTO, LRx, LSx, MAx, MTx, MUx, MVx, MWx, MXx
• 4236-CTO, NLx, NXx, NYx
• 4237-CTO
• 4238-CTO
04W0495
N
22
CPU assembly, Intel Dual Core i3-2330M (2.20 GHz)
• 4177-CTO, QVx, QWx, QXx, R9x, RBx, RCx, RDx
• 4178-CTO, AZx, B2x, B3x, B4x, BGx, BKx, BPx, BQx, BRx, BWx, BXx, CDx
• 4179-CTO, GGx, GHx, GJx, GMx
• 4180-CTO
• 4236-CTO, PSx, PTx
• 4237-CTO
• 4238-CTO
04W1891
N
22
CPU assembly, i5-2410M (2.30 GHz)
• 4177-CTO, 25x, 27x, 2Cx, 2Kx, 2Lx, 2Mx, 2Vx, 2Wx, QEx, QHx, QJx, QKx, QPx
• 4178-CTO, 53x, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 66x, 69x, 6Dx, 6Ex, 6Kx,
6Lx, 6Sx, 82x, 83x, 92x, 93x, 94x, 95x, 96x, 97x, 9Dx, 9Ex, 9Jx, 9Rx, 9Xx,
9Yx, 9Zx, A2x, A8x, AHx, AMx
• 4179-CTO, G7x
• 4180-CTO, J4x, LTx, M3x, N3x, N4x, N5x, NCx
• 4236-CTO, NKx, P6x, P7x, P8x
• 4237-CTO
• 4238-CTO
04W0496
N
22
CPU assembly, Intel Dual Core i5-2430M (2.40 GHz)
• 4177-CTO, QYx, QZx, R3x, R4x, R8x, RAx, RFx, RPx, RXx
• 4178-CTO, B5x, B6x, B7x, B8x, B9x, BDx, BFx, BHx, BJx, BMx, BSx, BTx,
BUx, BVx, BYx, BZx, C2x, C3x, C4x, CBx, CCx
• 4179-CTO
• 4180-CTO, PKx, PLx, PMx, PNx, PPx, PQx
• 4236-CTO, PHx, PJx, PPx, PQx, PUx, PVx, PWx
• 4237-CTO
• 4238-CTO
04W1893
N
Chapter 10. Parts list
145
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
22
CPU assembly, Intel Pentium B950 (2.10 GHz)
• 4177-CTO, GFx, GKx, GLx, GMx
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1895
N
22
CPU assembly, Intel Pentium B940 (2.0 GHz)
• 4177-CTO, QQx, QRx, QSx
• 4178-CTO, AQx, ARx
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1894
N
23
Backup battery
02K7078
04W1642
**
24
SmartCard Reader FPC cable
• 4177-CTO, 2Fx, 2Gx, 2Hx, Q7x, Q8x, QAx, QBx, QPx, R9x, RBx, RCx, RLx,
RMx, RRx, RSx, RTx, RUx
• 4178-CTO, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx,
5Yx, 5Zx, 66x, 67x, 68x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Qx, 6Rx, 6Xx,
6Yx, 6Zx, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, AEx, AXx,
AYx, AZx, B2x, B3x, B4x, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx,
BRx, BUx, BZx, C3x, C4x, C5x, C6x, CBx, CFx, CHx, CKx, CLx, CMx, CNx,
CPx, CQx, CXx, CYx
• 4179-CTO, GXx
• 4180-CTO, KEx, KFx, L9x, LAx, LBx, LPx, LQx, LVx, LXx, M8x, MCx, MDx, MEx,
MRx, MSx, MZx, N2x, NFx, PBx, PCx, PUx, PVx, PWx, PXx, PYx, PZx, Q3x
• 4236-CTO, N3x, NDx, NEx, PDx, PJx, PKx, PMx, PPx, PQx
• 4237-CTO
• 4238-CTO
04W1639
N
25
SmartCard Reader
• 4177-CTO, 2Fx, 2Gx, 2Hx, Q7x, Q8x, QAx, QBx, QPx, R9x, RBx, RCx, RLx,
RMx, RRx, RSx, RTx, RUx
• 4178-CTO, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx,
5Zx, 66x, 67x, 68x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Qx, 6Rx, 6Xx, 6Yx,
6Zx, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, A5x, A6x, A7x, AEx,
AXx, AYx, AZx, B2x, B3x, B4x, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx,
BRx, BUx, BVx, BWx, BXx, BZx, C3x, C4x, C5x, C6x, CBx, CFx, CHx, CKx,
CLx, CMx, CNx, CPx, CQx, CXx, CYx
• 4179-CTO, GXx
• 4180-CTO, KEx, KFx, L9x, LAx, LBx, LPx, LQx, LVx, LXx, M8x, MCx, MDx,
MEx, MRx, MSx, MZx, N2x, NDx, NEx, NFx, PBx, PCx, PUx, PVx, PWx, PXx,
PYx, PZx, Q3x
• 4236-CTO, N3x, NDx, NEx, PDx, PJx, PKx, PMx, PPx, PQx
• 4237-CTO
• 4238-CTO
04W1638
04W2084
N
146
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
26
Fan assembly, integrated
• 4177-CTO, 25x, 26x, 27x, 28x, 29x, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx, 2Qx, 2Rx, 2Sx,
35x, 36x, GKx, GMx, Q2x, Q5x, Q7x, Q8x, QAx, QCx, QDx, QGx, QJx, QKx,
QLx, QMx, QNx, QQx, QSx, QTx, QUx, QVx, R2x, R3x, R5x, R6x, R7x, R8x,
R9x, RBx, RFx, RGx, RMx, RNx, RPx, RRx, RSx, RVx, RYx
• 4178-CTO, 52x, 53x, 56x, 57x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Jx, 5Kx, 5Lx, 5Mx,
5Nx, 5Px, 5Rx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 66x, 67x, 68x, 69x, 6Bx, 6Cx, 6Dx,
6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx, 6Mx, 6Nx, 6Qx, 6Tx, 6Ux, 6Zx, 83x, 84x,
92x, 93x, 95x, 96x, 97x, 98x, 9Bx, 9Cx, 9Fx, 9Gx, 9Px, 9Qx, 9Rx, 9Vx, 9Wx,
9Yx, 9Zx, A7x, A8x, AAx, ABx, ACx, ADx, AFx, AGx, AHx, AJx, AKx, ALx, AMx,
ANx, APx, ARx, ASx, ATx, AUx, AVx, AWx, AYx, AZx, B2x, B3x, B4x, B5x, B6x,
B7x, B9x, BAx, BBx, BCx, BDx, BEx, BGx, BJx, BKx, BMx, BNx, BPx, BSx,
BWx, BYx, C2x, C3x, C8x, C9x, CBx, CCx, CDx, CEx, CFx, CJx, CKx, CLx,
CRx, CSx, CUx, CWx, CXx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, GBx, GEx, GGx, GQx, GRx,
GSx
• 4180-CTO, 62x, 63x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx, KCx,
KDx, KEx, KFx, KGx, KHx, KJx, KKx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LNx,
LPx, LRx, LSx, LTx, LUx, LWx, M2x, M7x, M8x, M9x, MBx, MCx, MDx, MEx,
MJx, MLx, MNx, MPx, MQx, MSx, MUx, MVx, MWx, MYx, N2x, NBx, NCx,
NDx, NFx, PAx, PBx, PCx, PDx, PEx, PFx, PGx, PHx, PJx, PVx, PXx, Q2x, Q3x
• 4236-CTO, 62x, 63x, MBx, N2x, N3x, N5x, N6x, N7x, N8x, NCx, NGx, NHx,
NKx, NLx, NMx, NNx, NTx, NUx, NXx, NYx, P3x, P4x, P5x, P6x, P7x, P8x,
P9x, PAx, PBx, PCx, PDx, PEx, PGx, PHx, PJx, PLx, PMx, PPx, PQx, PSx,
PTx, PUx, PVx, PXx
• 4237-CTO
• 4238-CTO
04W0407
04W0409
N
26
Fan assembly, discrete
• 4177-CTO, 22x, 23x, 24x, 2Ax, 2Bx, 2Cx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Tx,
2Ux, 2Vx, 2Wx, 2Xx, 2Yx, 32x, 33x, 34x, GFx, GLx, Q3x, Q4x, QBx, QEx, QFx,
QHx, QPx, QRx, QWx, QXx, QYx, QZx, R4x, RAx, RCx, RDx, RHx, RJx, RKx,
RLx, RQx, RTx, RUx, RWx, RXx, RZx
• 4178-CTO, 54x, 55x, 58x, 5Ex, 5Fx, 5Gx, 5Hx, 5Qx, 5Sx, 5Yx, 5Zx, 6Ax, 6Px,
6Rx, 6Sx, 6Vx, 6Wx, 6Xx, 6Yx, 82x, 94x, 99x, 9Ax, 9Dx, 9Ex, 9Hx, 9Jx, 9Kx,
9Lx, 9Mx, 9Nx, 9Sx, 9Tx, 9Ux, 9Xx, A2x, A3x, A4x, A5x, A6x, A9x, AEx, AQx,
AXx, B8x, BFx, BHx, BQx, BRx, BTx, BUx, BVx, BXx, BZx, C4x, C5x, C6x, C7x,
CAx, CGx, CHx, CMx, CNx, CPx, CQx, CVx, CYx
• 4179-CTO, G9x, GCx, GDx, GHx, GJx, GMx, GNx, GPx, GTx, GUx, GVx, GWx,
GXx
• 4180-CTO, 64x, 65x, J2x, J3x, J4x, KLx, KMx, KNx, KPx, KQx, KRx, KSx, KTx,
KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x, L9x, LAx,
LBx, LCx, LLx, LMx, LQx, LVx, LXx, LYx, LZx, M3x, M4x, M5x, M6x, MAx, MFx,
MGx, MHx, MKx, MMx, MRx, MTx, MXx, MZx, N3x, N4x, N5x, N6x, N7x, N8x,
N9x, NAx, NEx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx, PTx, PUx, PWx,
PYx, PZx, Q4x, Q5x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 64x, 65x, N4x, N9x, NAx, NBx, NDx, NEx, NFx, NPx, NQx, NRx,
NSx, NVx, NWx, P2x, PFx, PKx, PNx, PRx, PWx, PYx
• 4237-CTO
• 4238-CTO
04W0408
04W0410
N
Chapter 10. Parts list
147
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
27
FPC cable (touch pad with fingerprint reader and Bluetooth)
• 4177-CTO, 22x, 23x, 24x, 27x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx, 2Hx,
2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 2Xx, 2Yx,
32x, 33x, 34x, 35x, 36x, GFx, GKx, GLx, GMx, Q2x, Q3x, Q4x, Q7x, Q8x, QAx,
QBx, QEx, QHx, QNx, QPx, QQx, QRx, QTx, QUx, QVx, QWx, QXx, QYx, QZx,
R4x, R5x, R6x, R7x, R8x, R9x, RAx, RBx, RCx, RDx, RFx, RGx, RHx, RJx, RKx,
RLx, RMx, RNx, RPx, RQx, RRx, RSx, RTx, RUx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx,
5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx,
66x, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx,
6Mx, 6Nx, 6Px, 6Qx, 6Rx, 6Sx, 6Tx, 6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 82x, 83x,
84x, 92x, 93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, 9Jx, 9Kx,
9Lx, 9Mx, 9Px, 9Qx, 9Sx, 9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x,
A8x, A9x, ABx, ADx, AEx, AFx, AGx, AHx, AJx, AKx, ALx, AMx, ANx, APx, ASx,
ATx, AUx, AVx, AWx, AXx, AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B8x, B9x,
BAx, BBx, BCx, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx, BPx, BQx,
BRx, BSx, BTx, BUx, BYx, BZx, C2x, C3x, C4x, C5x, C6x, C7x, C8x, C9x, CAx,
CBx, CCx, CDx, CEx, CFx, CGx, CHx, CJx, CKx, CLx, CMx, CNx, CPx, CQx,
CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GBx, GCx, GDx, GGx, GHx,
GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, 63x, 65x, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x,
KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KPx,
KQx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x,
L7x, L8x, L9x, LAx, LBx, LNx, LPx, LQx, LRx, LSx, LTx, LUx, LVx, LWx, LXx,
LYx, LZx, M2x, M3x, M4x, M5x, M6x, M7x, M8x, MAx, MBx, MCx, MDx, MEx,
MFx, MGx, MHx, MJx, MKx, MMx, MNx, MPx, MQx, MRx, MSx, MTx, MUx,
MVx, MWx, MXx, MYx, MZx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx,
NBx, NFx, PAx, PBx, PCx, PFx, PGx, PHx, PKx, PLx, PMx, PNx, PPx, PQx, PRx,
PSx, PTx, PUx, PVx, PWx, PXx, PYx, PZx, Q3x, Q4x, Q5x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 63x, MBx, N2x, N3x, N4x, N5x, N8x, N9x, NAx, NBx, NCx, NDx,
NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx, NTx, NUx,
NVx, NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx, PBx, PCx,
PDx, PEx, PFx, PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx,
PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
04W1625
N
28
Bluetooth daughter card (BDC-3.0)
• 4177-CTO, 22x, 23x, 24x, 25x, 29x, 2Ax, 2Bx, 2Cx, 2Ex, 2Jx, 2Xx, 36x, GFx,
GKx, GLx, GMx, Q4x, Q7x, QAx, QCx, QPx, QQx, QRx, QSx, R9x, RBx, RCx,
RFx
• 4178-CTO, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx,
5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx, 66x, 67x, 68x, 69x,
6Ax, 6Hx, 6Jx, 6Kx, 6Lx, 6Qx, 6Rx, 6Sx, 6Tx, 6Xx, 6Yx, 6Zx, 82x, 83x, 84x, 92x,
93x, 94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, A5x, A6x, A7x, AJx,
AKx, AQx, ARx, BDx, BEx, BFx, BHx, BJx, BMx, BNx, BPx, BQx, BRx, BUx,
BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, CBx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GCx, GDx, GGx, GHx,
GJx, GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, J2x, J3x, J4x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx,
KCx, KDx, KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KPx, KQx, KRx,
KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x,
L9x, LAx, LBx, LCx, LDx, LEx, LFx, LGx, LHx, LJx, LKx, LLx, LMx, LNx, LPx,
LQx, LRx, LSx, LTx, LYx, LZx, M2x, M3x, M4x, M5x, M6x, M9x, MAx, MBx,
MCx, MDx, MEx, MFx, MGx, MQx, MRx, MSx, MTx, MUx, MVx, MWx, MXx,
MZx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NCx, NFx, PDx, PKx, PLx,
PMx, PNx, PPx, PQx, PSx, PXx, Q3x, Q6x, Q7x, Q8x, Q9x
60Y3271
60Y3275
N
148
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 9. Parts list—Overall (continued)
No.
FRU (Overall)
FRU no.
CRU ID
• 4236-CTO, MBx, N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx,
NDx, NEx, NFx, NGx, NHx, NKx, NLx, NMx, NNx, NPx, NQx, NRx, NSx, NTx,
NWx, NXx, NYx, P2x, P3x, P4x, P5x, P6x, P8x, P9x, PBx, PCx, PDx, PEx,
PHx, PJx
• 4237-CTO
• 4238-CTO
29
Keyboard (see “Keyboard” on page 154.)
30
TrackPoint caps
91P9642
*
—
Thermal grease
91P8835
N
—
ac power adapter (see “Information about ac power adapters” on page 158.)
Chapter 10. Parts list
149
LCD FRUs
10
1
2
3
9
8
7
4
5
6
Table 10. Parts list—LCD FRUs
No. FRU
a,
b
See “Miscellaneous parts” on page 156.
1
LCD bezel assembly
150
ThinkPad T420 and T420i Hardware Maintenance Manual
FRU no.
CRU
ID
04W1609
N
Table 10. Parts list—LCD FRUs (continued)
No. FRU
FRU no.
CRU
ID
2
Camera module
• 4177-CTO, 22x, 23x, 24x, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Ex, 2Fx, 2Gx,
2Hx, 2Jx, 2Kx, 2Lx, 2Mx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 2Xx, 2Yx, 32x,
33x, 34x, 35x, 36x, GFx, GKx, GLx, GMx, Q2x, Q3x, Q4x, Q5x, Q8x, QAx, QBx, QDx,
QEx, QGx, QHx, QJx, QKx, QLx, QMx, QNx, QPx, QQx, QRx, QSx, QUx, QVx, QWx,
QXx, QYx, QZx, R2x, R3x, R4x, R7x, R8x, R9x, RAx, RBx, RCx, RDx, RFx, RGx, RHx,
RJx, RKx, RLx, RMx, RNx, RPx, RQx, RRx, RSx, RTx, RUx, RVx, RWx, RXx, RYx, RZx
• 4178-CTO, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx,
5Hx, 5Jx, 5Kx, 5Lx, 5Mx, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx,
5Zx, 66x, 67x, 68x, 69x, 6Ax, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Kx, 6Lx, 6Mx,
6Nx, 6Px, 6Qx, 6Rx, 6Sx, 6Tx, 6Ux, 6Vx, 6Wx, 6Xx, 6Yx, 6Zx, 82x, 83x, 84x, 92x, 93x,
94x, 95x, 96x, 97x, 98x, 99x, 9Ax, 9Bx, 9Cx, 9Dx, 9Ex, 9Fx, 9Gx, 9Hx, 9Jx, 9Kx, 9Lx,
9Mx, 9Nx, 9Px, 9Qx, 9Rx, 9Sx, 9Tx, 9Ux, 9Vx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x,
A5x, A6x, A7x, A8x, A9x, AAx, ABx, ADx, AEx, AFx, AGx, AHx, AJx, AKx, ALx, AMx,
ANx, APx, AQx, ARx, ASx, ATx, AUx, AVx, AWx, AXx, AYx, AZx, B2x, B3x, B4x, B5x,
B6x, B7x, B8x, B9x, BAx, BBx, BCx, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx,
BPx, BQx, BRx, BSx, BTx, BUx, BVx, BWx, BXx, BYx, BZx, C2x, C3x, C4x, C5x, C6x,
C7x, C8x, C9x, CAx, CBx, CCx, CDx, CEx, CFx, CGx, CHx, CJx, CKx, CLx, CMx,
CNx, CPx, CQx, CRx, CSx, CUx, CVx, CWx, CXx, CYx
• 4179-CTO, G3x, G4x, G5x, G6x, G7x, G8x, G9x, GBx, GCx, GDx, GGx, GHx, GJx,
GMx, GNx, GPx, GQx, GRx, GSx, GTx, GUx, GVx, GWx, GXx
• 4180-CTO, 62x, 63x, 64x, 65x, J2x, J3x, J4x, K7x, K8x, K9x, KAx, KBx, KCx, KDx,
KEx, KFx, KGx, KHx, KJx, KKx, KLx, KMx, KNx, KQx, KRx, KSx, KTx, KUx, KVx, KWx,
KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L7x, L8x, L9x, LAx, LBx, LCx, LDx, LFx,
LGx, LHx, LLx, LMx, LNx, LPx, LQx, LRx, LSx, LTx, LVx, LWx, LXx, LYx, LZx, M2x,
M3x, M4x, M5x, M6x, M7x, M8x, M9x, MAx, MBx, MCx, MDx, MEx, MGx, MHx, MJx,
MKx, MMx, MNx, MPx, MQx, MRx, MSx, MTx, MUx, MVx, MWx, MXx, MYx, MZx,
N2x, N3x, N4x, N5x, N6x, N7x, N8x, N9x, NAx, NBx, NCx, NFx, PAx, PBx, PCx, PFx,
PGx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx, PTx, PUx, PVx, PWx, PXx, PYx, PZx,
Q2x, Q3x, Q4x, Q5x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 62x, 63x, 64x, 65x, MBx, N2x, N4x, N5x, N7x, N8x, N9x, NAx, NBx, NCx,
NDx, NEx, NFx, NGx, NHx, NKx, NLx, NPx, NQx, NRx, NSx, NTx, NUx, NVx, NWx,
NXx, NYx, P2x, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx, PBx, PCx, PDx, PEx, PFx,
PGx, PHx, PJx, PKx, PLx, PMx, PNx, PPx, PQx, PRx, PSx, PTx, PUx, PVx, PWx,
PXx, PYx
• 4237-CTO
• 4238-CTO
60Y9994
N
2
Camera module (No camera and with microphone)
• 4177-CTO, Q7x, QCx, QFx, QTx, R5x, R6x
• 4178-CTO, ACx
• 4179-CTO, G2x, GEx
• 4180-CTO, K2x, K3x, K4x, K5x, K6x, KPx, LEx, LJx, LKx, LUx, MFx, MLx, NDx, NEx,
PDx, PEx, PHx, PJx
• 4236-CTO, N3x, N6x, NMx, NNx
• 4237-CTO
• 4238-CTO
04W1613
N
2
Camera module (No camera and no integrated microphone)
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
04W1614
N
Chapter 10. Parts list
151
Table 10. Parts list—LCD FRUs (continued)
No. FRU
FRU no.
CRU
ID
3
LCD module, 14.0-inch HD (1366 x 768) LED backlight Anti-Glare Display
• 4177-CTO, 25x, 26x, 27x, 28x, 2Dx, 2Jx, 2Mx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 32x,
33x, 34x, Q2x, Q5x, Q7x, QCx, QEx, QGx, QJx, QLx, QNx, QPx, QTx, QUx, QWx,
QXx, QYx, QZx, R2x, R3x, R5x, R6x, R7x, R9x, RBx, RCx, RFx, RGx, RHx, RJx, RNx,
RPx, RRx, RSx, RTx, RUx, RVx, RYx, RZx
• 4178-CTO, 52x, 56x, 57x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx,
5Mx, 69x, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Mx, 6Qx, 6Tx, 6Ux, 6Zx, 83x,
84x, 92x, 93x, 94x, 95x, 98x, 9Fx, 9Gx, 9Hx, 9Nx, 9Ux, 9Vx, 9Wx, 9Yx, A5x, A6x, A7x,
AAx, ABx, ACx, ADx, AGx, AHx, AJx, AKx, AMx, ANx, APx, ATx, AUx, AVx, AWx,
AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B9x, BAx, BBx, BCx, BKx, BPx, BVx, BWx,
BXx, BYx, BZx, C2x, C3x, C4x, CCx, CDx, CFx, CJx, CKx, CLx, CMx, CNx, CPx,
CQx, CRx, CSx, CUx, CXx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, GEx, GQx, GRx, GVx, GWx
• 4180-CTO, 62x, 64x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx, KCx, KDx,
KEx, KFx, KGx, KLx, KMx, KNx, L7x, L8x, L9x, LCx, LDx, LEx, LFx, LGx, LHx, LJx,
LKx, LLx, LMx, LNx, LPx, LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, M2x, M3x, M4x,
M5x, M6x, M7x, M9x, MCx, MLx, MNx, MTx, MUx, MVx, MWx, N6x, NCx, NDx, NEx,
PAx, PBx, PCx, PDx, PEx, PFx, PHx, PJx, PTx, PXx, Q2x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 62x, 64x, N2x, N3x, N5x, NCx, NDx, NKx, NLx, NMx, NQx, NRx, NUx, NXx,
NYx, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx, PBx, PCx, PDx, PEx, PHx, PJx, PLx,
PQx, PSx, PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
93P5691
93P5687
04W0476
93P5697
N
3
LCD module, 14.0-inch HD+ (1600 x 900) LED backlight Anti-Glare Display
• 4177-CTO, 2Kx, 2Lx, 2Nx, 2Px, 2Qx, 2Yx, 35x, Q3x, Q4x, Q8x, QAx, QBx, QFx, QHx,
QKx, QVx, R4x, R8x, RAx, RDx, RKx, RLx, RMx, RQx
• 4178-CTO, 54x, 55x, 58x, 59x, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx,
5Yx, 5Zx, 66x, 67x, 68x, 6Ax, 6Kx, 6Lx, 6Nx, 6Px, 6Rx, 6Sx, 6Vx, 6Wx, 6Xx, 6Yx, 82x,
96x, 97x, 99x, 9Ax, 9Bx, 9Cx, 9Jx, 9Kx, 9Lx, 9Mx, 9Px, 9Qx, 9Rx, 9Sx, 9Tx, 9Xx,
9Zx, A2x, A3x, A4x, A8x, A9x, AEx, AFx, ALx, ASx, AXx, B8x, BDx, BEx, BFx, BGx,
BHx, BJx, BMx, BNx, BQx, BRx, BSx, BTx, BUx, C5x, C6x, C7x, C8x, C9x, CAx,
CBx, CEx, CGx, CHx, CVx, CWx, CYx
• 4179-CTO
• 4180-CTO, 63x, 65x, J2x, KHx, KJx, KKx, KPx, KQx, KRx, KSx, KTx, KUx, KVx, KWx,
KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, LAx, LBx, LQx, LZx, M8x, MBx, MDx, MEx,
MFx, MHx, MJx, MKx, MMx, MPx, MQx, MRx, MSx, MYx, MZx, N2x, N5x, N7x, N8x,
N9x, NAx, NBx, NFx, PGx, PNx, PRx, PSx, PUx, PVx, PWx, PYx, PZx, Q3x, Q4x, Q5x
• 4236-CTO, 63x, 65x, MBx, N4x, N6x, N7x, N8x, N9x, NAx, NBx, NEx, NFx, NGx, NHx,
NNx, NSx, NTx, NVx, P2x, PFx, PGx, PKx, PMx, PNx, PRx
• 4237-CTO
• 4238-CTO
93P5693
93P5689
N
4
Hinges
04W1610
04W1612
04W1611
N
5
Wireless antenna set
04W1615
04W1616
N
6
LCD rear cover assembly
04W1608
N
7
LED cable with camera bracket
04W1619
N
152
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 10. Parts list—LCD FRUs (continued)
No. FRU
FRU no.
CRU
ID
8
LCD cable (for 14.0-inch HD LCD module)
• 4177-CTO, 25x, 26x, 27x, 28x, 2Dx, 2Jx, 2Mx, 2Rx, 2Sx, 2Tx, 2Ux, 2Vx, 2Wx, 32x,
33x, 34x, Q2x, Q5x, Q7x, QCx, QEx, QGx, QJx, QLx, QNx, QPx, QTx, QUx, QWx,
QXx, QYx, QZx, R2x, R3x, R5x, R6x, R7x, R9x, RBx, RCx, RFx, RGx, RHx, RJx, RNx,
RPx, RRx, RSx, RTx, RUx, RVx, RYx, RZx
• 4178-CTO, 52x, 56x, 57x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Jx, 5Kx, 5Lx,
5Mx, 69x, 6Bx, 6Cx, 6Dx, 6Ex, 6Fx, 6Gx, 6Hx, 6Jx, 6Mx, 6Qx, 6Tx, 6Ux, 6Zx, 83x,
84x, 92x, 93x, 94x, 95x, 98x, 9Fx, 9Gx, 9Hx, 9Nx, 9Ux, 9Vx, 9Wx, 9Yx, A5x, A6x, A7x,
AAx, ABx, ACx, ADx, AGx, AHx, AJx, AKx, AMx, ANx, APx, ATx, AUx, AVx, AWx,
AYx, AZx, B2x, B3x, B4x, B5x, B6x, B7x, B9x, BAx, BBx, BCx, BKx, BPx, BVx, BWx,
BXx, BYx, BZx, C2x, C3x, C4x, CCx, CDx, CFx, CJx, CKx, CLx, CMx, CNx, CPx,
CQx, CRx, CSx, CUx, CXx
• 4179-CTO, G2x, G3x, G4x, G5x, G6x, G7x, GEx, GQx, GRx, GVx, GWx
• 4180-CTO, 62x, 64x, K2x, K3x, K4x, K5x, K6x, K7x, K8x, K9x, KAx, KBx, KCx, KDx,
KEx, KFx, KGx, KLx, KMx, KNx, L7x, L8x, L9x, LCx, LDx, LEx, LFx, LGx, LHx, LJx,
LKx, LLx, LMx, LNx, LPx, LRx, LSx, LTx, LUx, LVx, LWx, LXx, LYx, M2x, M3x, M4x,
M5x, M6x, M7x, M9x, MCx, MLx, MNx, MTx, MUx, MVx, MWx, N6x, NCx, NDx, NEx,
PAx, PBx, PCx, PDx, PEx, PFx, PHx, PJx, PTx, PXx, Q2x, Q6x, Q7x, Q8x, Q9x
• 4236-CTO, 62x, 64x, N2x, N3x, N5x, NCx, NDx, NKx, NLx, NMx, NQx, NRx, NUx, NXx,
NYx, P3x, P4x, P5x, P6x, P7x, P8x, P9x, PAx, PBx, PCx, PDx, PEx, PHx, PJx, PLx,
PQx, PSx, PTx, PUx, PVx, PWx, PXx, PYx
• 4237-CTO
• 4238-CTO
04W1617
N
8
LCD cable (for 14.0-inch HD+ LCD module)
• 4177-CTO, 2Kx, 2Lx, 2Nx, 2Px, 2Qx, 2Yx, 35x, Q3x, Q4x, Q8x, QAx, QBx, QFx, QHx,
QKx, QVx, R4x, R8x, RAx, RDx, RKx, RLx, RMx, RQx
• 4178-CTO, 54x, 55x, 58x, 59x, 5Nx, 5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx,
5Yx, 5Zx, 66x, 67x, 68x, 6Ax, 6Kx, 6Lx, 6Nx, 6Px, 6Rx, 6Sx, 6Vx, 6Wx, 6Xx, 6Yx, 82x,
96x, 97x, 99x, 9Ax, 9Bx, 9Cx, 9Jx, 9Kx, 9Lx, 9Mx, 9Px, 9Qx, 9Rx, 9Sx, 9Tx, 9Xx,
9Zx, A2x, A3x, A4x, A8x, A9x, AEx, AFx, ALx, ASx, AXx, B8x, BDx, BEx, BFx, BGx,
BHx, BJx, BMx, BNx, BQx, BRx, BSx, BTx, BUx, C5x, C6x, C7x, C8x, C9x, CAx,
CBx, CEx, CGx, CHx, CVx, CWx, CYx
• 4179-CTO
• 4180-CTO, 63x, 65x, J2x, KHx, KJx, KKx, KPx, KQx, KRx, KSx, KTx, KUx, KVx, KWx,
KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, LAx, LBx, LQx, LZx, M8x, MBx, MDx, MEx,
MFx, MHx, MJx, MKx, MMx, MPx, MQx, MRx, MSx, MYx, MZx, N2x, N5x, N7x, N8x,
N9x, NAx, NBx, NFx, PGx, PNx, PRx, PSx, PUx, PVx, PWx, PYx, PZx, Q3x, Q4x, Q5x
• 4236-CTO, 63x, 65x, MBx, N4x, N6x, N7x, N8x, N9x, NAx, NBx, NEx, NFx, NGx, NHx,
NNx, NSx, NTx, NVx, P2x, PFx, PGx, PKx, PMx, PNx, PRx
• 4237-CTO
• 4238-CTO
04W1618
9
LED sub card
04W1370
N
10
Clear plate kit
04W1620
N
Chapter 10. Parts list
153
Keyboard
Table 11. Parts list—Keyboard
Language
FRU no.
Arabic
45N2076
45N2146
45N2216
Belgian
45N2077
45N2147
45N2217
Brazilian Portuguese
45N2075
45N2145
45N2215
Bulgarian
45N2078
45N2148
45N2218
Canadian French (058)
45N2073
45N2143
45N2213
Canadian French (Acnor)
45N2072
45N2142
45N2212
Czech
45N2079
45N2149
45N2219
Danish
45N2080
45N2150
45N2220
Finnish, Swedish
45N2097
45N2167
45N2237
French
45N2082
45N2152
45N2222
German
45N2083
45N2153
45N2223
Greek (U. S. English and Greek layout)
45N2084
45N2154
45N2224
Hebrew
45N2085
45N2155
45N2225
Hungarian
45N2086
45N2156
45N2226
Icelandic
45N2087
45N2157
45N2227
Indian
63Y0219
63Y0221
63Y0223
Italian
45N2088
45N2158
45N2228
Japanese
45N2102
45N2172
45N2242
Kazakhstan
45N2089
45N2159
45N2229
Korean
45N2103
45N2173
45N2243
Latin American Spanish
45N2074
45N2144
45N2214
Norwegian
45N2091
45N2161
45N2231
Polish
45N2092
45N2162
45N2232
Portuguese
45N2093
45N2163
45N2233
Russian
45N2094
45N2164
45N2234
Slovak
45N2095
45N2165
45N2235
Slovenian
45N2096
45N2166
45N2236
Spanish
45N2081
45N2151
45N2221
Swiss
45N2098
45N2168
45N2238
Thai
45N2105
45N2175
45N2245
Traditional Chinese
45N2104
45N2174
45N2244
Turkish
45N2099
45N2169
45N2239
U.K. English
45N2100
45N2170
45N2240
U.S. English
45N2071
45N2141
45N2211
U.S. English (International, with a Euro symbol)
45N2101
45N2171
45N2241
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ThinkPad T420 and T420i Hardware Maintenance Manual
CRU
ID
**
Table 11. Parts list—Keyboard (continued)
Language
FRU no.
Netherlands
45N2090
45N2160
45N2230
Turkish (F Type)
60Y9552
60Y9554
60Y9550
CRU
ID
Chapter 10. Parts list
155
Miscellaneous parts
Table 12. Parts list—Miscellaneous parts
FRU
FRU no.
CRU
ID
Screw and seal kit:
• M2 × 3 mm, black (50)
• M2 × 5 mm, black (20)
• M2 × 8 mm, black (15)
• M2 × 10 mm, Silver (4)
• M2 × 15 mm, black (8)
• M2.5 × 4 mm, black (8)
• M2.5 × 6 mm, black (8)
• M2 (shoulder), black (4)
• Hex stud, Silver (4)
• Tape 10 x 20 mm (10)
• Tape 10 x 25 mm (5)
• DDR3 tape (5)
04W1605
N
Base miscellaneous parts:
• Foot rubber - front left
• Foot rubber - front right
• Foot rubber - rear
• Bottom shield
• Insulation sheet - CPU
• Insulation sheet - system board
• Insulation sheet - touchpad
• Insulation sheet - battery connector
• Lens, LED (RJ-45)
• Knob, wireless switch
• Lever, wireless switch
• ODD lock button
• ODD eject spring
• ODD eject button
• ODD eject brecket
• Dust filter 1
• Dust filter 2
• Dust filter 3
• Dust filter 4
• Dust filter 5
• ODD stop rubber
• Sponge L43W4H5
• Sponge L15W4H5
• Sponge L110W4H5
• Sponge L85W3H3
• Sponge L26W4H1
04W1602
N
Keyboard bezel miscellaneous parts:
• Magnet - suspend switch
• Bracket - touchpad
• Bracket - right speaker
• Bracket - left speaker
• Bracket - left speaker EMI spring
• Bracket - FPR EMI
• Speaker mesh
• Face sheet - touchpad
• ThinkPad logo
• Bracket - touchpad button
• Bracket - FPR
• Insulation sheet - touchpad
04W1603
N
156
ThinkPad T420 and T420i Hardware Maintenance Manual
Table 12. Parts list—Miscellaneous parts (continued)
FRU
FRU no.
CRU
ID
System miscellaneous parts:
• (a) Express dummy card
• (b) LCD connector bracket
• (c) Fan bracket, discrete
• CPU mylar for 35W SV GT2
• 1394 cover
• Dummy cover, RJ-11
• Plastic support for smart card
• Blind sheet for SIM card
• SIM dummy card
Note: Italicized letters in parentheses are references to the exploded view in “Overall”
on page 130.
04W1604
N
System board miscellaneous parts:
• Insulation sheet - MB
• Insulation sheet - DDR
• Insulation sheet - express card
• Insulation sheet - battery
• Insulation sheet - docking
• Insulation sheet - bottom hole
• Insulation sheet - DC-in
• Bracket - express card
• SIM guide bracket sub accessory
• CPU bracket sub accessory
• SIM slide spacer
• SIM pull tab
• Sponge for RJ45 connector
• Sponge for display port connector
• Sponge for HDD 1
• Sponge for HDD 2
• Sponge for HDD 3
• Sponge for ODD 1
• Sponge for ODD 2
04W1601
N
LCD miscellaneous parts:
• LCD front bezel
• Rubber - LCD front bezel
• Stopper - LCD front bezel
• LED lens - LCD front bezel
• Shield - EMC
• Clear plate - LCD rear cover
• LED lens - LCD rear cover
• ThinkPad logo
• Lenovo logo
• LCD latch - right
• LCD latch - left
• Sponge - center
• Sponge - upper
• Sponge - lower
• Stopper - upper right
• Stopper - upper left
• Stopper - lower right
• Stopper - lower left
04W1607
N
•
•
•
•
•
Insulation sheet - fingerprint
LCD latch left
LCD latch right
LCD link
LCD latch spring
Chapter 10. Parts list
157
Information about ac power adapters
Table 13. Parts list—2-pin ac power adapters
FRU
FRU no.
CRU
ID
2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T5282
*
2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4423
2-pin (65 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4419
2-pin (90 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4427
2-pin (90 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4431
2-pin (90 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4435
2-pin (90 W, 20 V) adapter (models CTO, xxE, xxF, xxJ, xxL, xxP, xxS, xxU, xxY)
42T4439
Table 14. Parts list—3-pin ac power adapters
FRU
FRU no.
CRU
ID
3-pin (65 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T5283
*
3-pin (65 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T4421
3-pin (65 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T4417
3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T4425
3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T4429
3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
42T4433
3-pin (90 W, 20 V) adapter (models CTO, xxA, xxB, xxG, xxH, xxK, xxM, xxQ, xxT, xxV)
45N0068
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ThinkPad T420 and T420i Hardware Maintenance Manual
Power cords
A ThinkPad power cord for a specific country or region is usually available only in that country or region:
Table 15. Parts list—2-pin power cords
Country or region
FRU no.
Argentina
• models -CTO, xxY
42T5020
42T5105
Brazil
• models -CTO, xxP
42T5180
42T5183
Canada, U.S.
• models -CTO, xxF, xxL, xxS, xxU
42T5008
42T5093
Japan
• models -CTO, xxE, xxJ
42T5014
42T5099
CRU
ID
*
Table 16. Parts list—3-pin power cords
Country or region
FRU no.
Australia, New Zealand
• models -CTO, xxM
42T5050
42T5135
Bangladesh, Sri Lanka, South Africa
• models -CTO, xxG
42T5056
42T5141
Canada, U.S.
• models -CTO, xxG, xxT
42T5004
42T5089
China (P.R.C.) (other than Hong Kong S.A.R.)
• models -CTO, xxC
42T5065
42T5150
Denmark
• models -CTO, xxG
42T5041
42T5126
European countries
• models -CTO, xxG
42T5029
42T5114
India
• models -CTO, xxQ
42T5083
42T5168
Israel
• models -CTO, xxG
42T5062
42T5147
Italy
• models -CTO, xxG
42T5047
42T5132
Korea
• models -CTO, xxK
42T5077
42T5162
Switzerland
• models -CTO, xxG
42T5044
42T5129
Taiwan
• models -CTO, xxV
42T5071
42T5156
U.K., China (Hong Kong S.A.R.)
• models -CTO, xxB, xxG, xxH
42T5035
42T5120
CRU
ID
Chapter 10. Parts list
*
159
Recovery discs
Windows XP Professional DVDs
Note: The Windows XP Professional recovery DVDs are available only for models with a valid Microsoft
Windows XP Professional certificate of authenticity (COA) affixed to the system. Due to a Microsoft licensing
limitation, if a model came with Windows XP Professional preinstalled from the factory, but has either a
Windows 7 or Windows Vista COA affixed to the system, that model is eligible only for recovery DVDs that
match the operating system specified on the COA.
Windows XP Professional is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 17. Parts list—Windows XP Professional recovery DVDs
Language
P/N
CRU
ID
French
04T1306
*
German
04T1307
Italian
04T1308
Japanese
04X0075
Simplified Chinese
04T1305
US English
04X0076
Windows Vista Business (32 bit) SP2 DVDs
Note: The Windows Vista recovery DVDs are available only for models with a valid Microsoft Windows Vista
certificate of authenticity (COA) affixed to the system. Due to a Microsoft licensing limitation, if a model came
with Windows Vista Business or Windows Vista Ultimate preinstalled from the factory, but has a Windows 7
COA affixed to the system, that model is eligible only for recovery DVDs that match the operating system
specified on the COA.
Windows Vista Business (32 bit) SP2 is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 18. Parts list—Windows Vista Business (32 bit) SP2 recovery DVDs
Language
P/N
CRU
ID
English (for India)
04T1309
*
US English
04T1311
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ThinkPad T420 and T420i Hardware Maintenance Manual
Windows Vista Home Basic (32 bit) SP2 DVDs
Note: The Windows Vista recovery DVDs are available only for models with a valid Microsoft Windows Vista
certificate of authenticity (COA) affixed to the system. Due to a Microsoft licensing limitation, if a model came
with Windows Vista Business or Windows Vista Ultimate preinstalled from the factory, but has a Windows 7
COA affixed to the system, that model is eligible only for recovery DVDs that match the operating system
specified on the COA.
Windows Vista Home Basic (32 bit) SP2 is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 19. Parts list—Windows Vista Home Basic (32 bit) SP2 recovery DVDs
Language
P/N
CRU
ID
US English
04T1312
*
Windows 7 Professional (32 bit) DVDs
Windows 7 Professional (32 bit) is preinstalled as the operating system in the following models:
• 4177-CTO, Q7x, QAx, QDx, QTx, R5x, R6x
• 4178-CTO, 9Px, 9Qx, 9Ux, 9Vx, ACx, ALx, ASx, AUx, AVx, BBx, BCx
• 4179-CTO, G3x, G7x, GQx, GRx
• 4180-CTO, K3x, K6x, K7x, KLx, KQx, L7x, LCx, LDx, LGx, LHx, LKx, LMx, LPx, LQx, LRx, LSx, LTx, MFx,
MLx, MPx, MYx, PHx, PJx, PPx, Q9x
• 4236-CTO, N6x, N7x, N8x, N9x, NAx, NDx, NEx, NLx
• 4237-CTO
• 4238-CTO
Table 20. Parts list—Windows 7 Professional (32 bit) recovery DVDs
Language
P/N
CRU
ID
French
04T1314
*
German
04T1315
Japanese
04T1316
C&L Nordics (Danish, Finnish, Swedish, Norwegian, and English)
04T1319
C&L EMEA (Dutch, French, German, Italian, and English)
04T1320
Spanish
04T1317
Simplified Chinese
04T1313
Traditional Chinese with English (Hong Kong S.A.R)
04T1611
US English
04T1318
Windows 7 Professional (64 bit) DVDs
Windows 7 Professional (64 bit) is preinstalled as the operating system in the following models:
• 4177-CTO, 25x, 26x, 27x, 28x, 29x, 2Ax, 2Bx, 2Cx, 2Dx, 2Kx, 2Nx, 2Px, 2Qx, 2Rx, 2Sx, 2Ux, 2Wx, 32x,
33x, 35x, Q2x, Q3x, Q4x, Q5x, Q8x, QBx, QCx, QEx, QGx, QHx, QKx, QLx, QMx, QNx, QPx, QVx,
Chapter 10. Parts list
161
•
•
•
•
•
•
QXx, QYx, R2x, R3x, R4x, R8x, R9x, RAx, RBx, RCx, RDx, RFx, RGx, RJx, RKx, RLx, RMx, RNx, RPx,
RQx, RRx, RTx, RVx, RWx, RXx, RYx
4178-CTO, 52x, 53x, 54x, 55x, 56x, 57x, 58x, 59x, 5Ax, 5Bx, 5Cx, 5Dx, 5Ex, 5Fx, 5Gx, 5Hx, 5Kx, 5Mx,
5Px, 5Qx, 5Rx, 5Sx, 5Tx, 5Ux, 5Vx, 5Wx, 5Xx, 5Yx, 5Zx, 66x, 67x, 68x, 6Ax, 6Cx, 6Ex, 6Fx, 6Gx, 6Hx,
6Kx, 6Mx, 6Nx, 6Px, 6Qx, 6Rx, 6Ux, 6Vx, 6Wx, 6Yx, 82x, 83x, 84x, 93x, 96x, 99x, 9Ax, 9Bx, 9Cx, 9Gx,
9Hx, 9Jx, 9Kx, 9Lx, 9Mx, 9Rx, 9Sx, 9Tx, 9Wx, 9Xx, 9Yx, 9Zx, A2x, A3x, A4x, A5x, A7x, A8x, A9x, AAx,
ABx, ADx, AEx, AFx, AGx, AHx, AKx, AMx, ANx, APx, ATx, AWx, AXx, AYx, B2x, B3x, B5x, B6x, B7x, B8x,
B9x, BAx, BDx, BEx, BFx, BGx, BHx, BJx, BKx, BMx, BNx, BPx, BQx, BRx, BSx, BTx, BUx, BVx, BXx,
C3x, C4x, C5x, C6x, C7x, C8x, C9x, CAx, CBx, CCx, CDx, CEx, CFx, CGx, CHx, CJx, CKx, CPx, CQx,
CRx, CSx, CUx, CVx, CWx, CXx, CYx
4179-CTO, GBx, GEx
4180-CTO, 62x, 63x, 64x, 65x, K2x, K4x, K5x, K8x, K9x, KAx, KBx, KCx, KDx, KEx, KFx, KGx, KHx, KJx,
KKx, KMx, KNx, KPx, KRx, KSx, KTx, KUx, KVx, KWx, KXx, KYx, KZx, L2x, L3x, L4x, L5x, L6x, L8x,
L9x, LAx, LBx, LUx, LVx, LWx, LXx, LYx, LZx, M2x, M3x, M4x, M5x, M6x, M7x, M8x, M9x, MBx, MCx,
MDx, MEx, MHx, MJx, MKx, MMx, MNx, MQx, MRx, MSx, MTx, MUx, MVx, MZx, N2x, N4x, N5x, N8x,
N9x, NAx, NBx, NDx, NEx, NFx, PAx, PBx, PCx, PEx, PFx, PGx, PMx, PNx, PRx, PSx, PTx, PUx, PVx,
PWx, PXx, PYx, PZx, Q2x, Q3x, Q4x, Q5x, Q8x
4236-CTO, 62x, 63x, 64x, 65x, MBx, N2x, N3x, N4x, N5x, NBx, NFx, NGx, NHx, NMx, NNx, NSx, NTx,
NUx, NVx, NXx, NYx, P2x, P3x, P5x, P6x, P7x, P8x, P9x, PAx, PCx, PFx, PGx, PHx, PJx, PKx, PLx, PMx,
PNx, PPx, PQx, PRx, PTx, PVx, PWx, PXx, PYx
4237-CTO
4238-CTO
Table 21. Parts list—Windows 7 Professional (64 bit) recovery DVDs
Language
P/N
CRU
ID
Arabic with English
04T1322
*
Brazilian Portuguese
04T1323
Czech with English
04T1326
C&L Nordics (Danish, Finnish, Swedish, Norwegian, and English)
04T1346
C&L EMEA (Dutch, French, German, Italian, and English)
04T1347
C&L Croatian (Slovenian, Croatian, and English)
04T1348
English (for India)
04T1327
French
04T1328
Greek with English
04T1329
German
04T1330
Hebrew with English
04T1331
Hungarian with English
04T1333
Japanese
04T1334
Korea with English
04T1335
Polish
04T1336
Portuguese with English
04T1337
Romanian with English
04T1338
Russian
04T1339
Slovak with English
04T1340
Spanish
04T1341
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ThinkPad T420 and T420i Hardware Maintenance Manual
Table 21. Parts list—Windows 7 Professional (64 bit) recovery DVDs (continued)
Language
P/N
Serbian-Latin with English
04T1342
Simplified Chinese
04T1324
Traditional Chinese with English (Hong Kong S.A.R.)
04T1332
Turkish with English
04T1343
Traditional Chinese with English
04T1325
US English (Disabled)
04T1344
US English
04T1345
CRU
ID
Windows 7 Home Basic (32 bit) DVDs
Windows 7 Home Basic (32 bit) is preinstalled as the operating system in the following models:
• 4177-CTO, 22x, 23x, 24x, 2Ex, 2Xx, 36x, GFx, GKx, GLx, GMx, QQx, QRx, QSx
• 4178-CTO, 6Sx, 9Dx, 9Ex, AQx, ARx
• 4179-CTO, G8x, G9x, GCx, GDx, GGx, GHx, GJx, GPx, GSx, GTx, GUx, GVx, GWx
• 4180-CTO, J2x, J3x, J4x, MAx, MGx, MXx, N3x, N6x, N7x, PKx, PLx, Q6x, Q7x
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 22. Parts list—Windows 7 Home Basic (32 bit) recovery DVDs
Language
P/N
CRU
ID
Arabic with English
04T1350
*
Brazilian Portuguese
04T1351
English (for India)
04T1353
French
04T1354
Portuguese with English
04T1355
Russian
04T1356
Simplified Chinese
04T1352
Spanish
04T1357
Serbian-Latin with English
04T1358
Turkish with English
04T1359
US English
04T1360
Windows 7 Home Premium (32 bit) DVDs
Windows 7 Home Premium (32 bit) is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO, G4x
• 4180-CTO, LNx
• 4236-CTO, NCx
• 4237-CTO
• 4238-CTO
Chapter 10. Parts list
163
Table 23. Parts list—Windows 7 Home Premium (32 bit) recovery DVDs
Language
P/N
CRU
ID
English (for India)
04T1362
*
Simplified Chinese
04T1361
US English
04T1363
Windows 7 Home Premium (64 bit) DVDs
Windows 7 Home Premium (64 bit) is preinstalled as the operating system in the following models:
• 4177-CTO, 2Jx, 2Lx, 2Mx, 2Tx, 2Vx, 2Yx, 34x, QFx, QJx, QUx, QWx, QZx, R7x, RHx, RSx, RUx, RZx
• 4178-CTO, 9Fx, 9Nx, A6x, BWx, CLx, CMx, CNx
• 4179-CTO, GMx, GNx
• 4180-CTO, NCx, PQx
• 4236-CTO, NPx, NQx, NRx, NWx
• 4237-CTO
• 4238-CTO
Table 24. Parts list—Windows 7 Home Premium (64 bit) recovery DVDs
Language
P/N
CRU
ID
Arabic with English
04T1364
*
Brazilian Portuguese
04T1365
Czech with English
04T1368
C&L Nordics (Danish, Finnish, Swedish, Norwegian, and English)
04T1387
C&L EMEA (Dutch, French, German, Italian, and English)
04T1388
C&L Croatian (Slovenian, Croatian, and English)
04T1389
French
04T1369
Greek with English
04T1370
German
04T1371
Hebrew with English
04T1372
Hungarian with Engish
04T1374
Japanese
04T1375
Korea with English
04T1376
Polish
04T1377
Portuguese with English
04T1378
Romanian with English
04T1379
Russian
04T1380
Slovak with English
04T1381
Simplified Chinese
04T1366
Spanish
04T1382
Serbian-Latin with English
04T1383
Traditional Chinese with English
04T1367
Traditional Chinese with English (Hong Kong S.A.R.)
04T1373
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ThinkPad T420 and T420i Hardware Maintenance Manual
Table 24. Parts list—Windows 7 Home Premium (64 bit) recovery DVDs (continued)
Language
P/N
Turkish with English
04T1384
US English (Disabled)
04T1385
US English
04T1386
CRU
ID
Windows 7 Ultimate (32 bit) DVDs
Windows 7 Ultimate (32 bit) is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 25. Parts list—Windows 7 Ultimate (32 bit) recovery DVDs
Language
P/N
CRU
ID
US English
04T1321
*
Windows 7 Ultimate (64 bit) DVDs
Windows 7 Ultimate (64 bit) is preinstalled as the operating system in the following models:
• 4177-CTO
• 4178-CTO
• 4179-CTO
• 4180-CTO
• 4236-CTO
• 4237-CTO
• 4238-CTO
Table 26. Parts list—Windows 7 Ultimate (64 bit) recovery DVDs
Language
P/N
CRU
ID
US English
04T1349
*
Chapter 10. Parts list
165
Common service tools
Table 27. Parts list—Common service tools
Tool
P/N
Screwdriver kit
95F3598
1/4" drive spinner handle
1650840
1/4" Sq. to 1/4" hex torx adapter
93F2838
TR7-TR-10 tamper resistant torx bits
00P6967
Removal tool antenna RF connector
08K7159
USB 2.0 CD-RW/DVD-ROM combo drive II
40Y8687
USB cable
40Y8704
USB floppy diskette drive for maintenance diskette
05K9283
USB floppy diskette drive tool kit
27L3452
Test card for integrated Smart Card
42W7820
LENOVO ThinkPad Hardware Maintenance Diskette Version 1.76 or later
Note: Download the file from the following Web site:
http://www.lenovo.com/support
—
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ThinkPad T420 and T420i Hardware Maintenance Manual
Appendix A. Notices
Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult
your local Lenovo representative for information on the products and services currently available in your
area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that
Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service
that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user’s
responsibility to evaluate and verify the operation of any other product, program, or service.
Lenovo may have patents or pending patent applications covering subject matter described in this
document. The furnishing of this document does not give you any license to these patents. You can send
license inquiries, in writing, to:
Lenovo (United States), Inc.
1009 Think Place - Building One
Morrisville, NC 27560
U.S.A.
Attention: Lenovo Director of Licensing
LENOVO GROUP LTD. PROVIDES THIS PUBLICATION “AS IS” WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some
jurisdictions do not allow disclaimer of express or implied warranties in certain transactions, therefore,
this statement may not apply to you.
This information could include technical inaccuracies or typographical errors. Changes are periodically
made to the information herein; these changes will be incorporated in new editions of the publication.
Lenovo may make improvements and/or changes in the product(s) and/or the program(s) described in this
publication at any time without notice.
The products described in this document are not intended for use in implantation or other life support
applications where malfunction may result in injury or death to persons. The information contained in this
document does not affect or change Lenovo product specifications or warranties. Nothing in this document
shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo
or third parties. All information contained in this document was obtained in specific environments and is
presented as an illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it believes appropriate without
incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in
any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of
the materials for this Lenovo product, and use of those Web sites is at your own risk.
Any performance data contained herein was determined in a controlled environment. Therefore, the result
obtained in other operating environments may vary significantly. Some measurements may have been
made on development-level systems and there is no guarantee that these measurements will be the same
on generally available systems. Furthermore, some measurements may have been estimated through
extrapolation. Actual results may vary. Users of this document should verify the applicable data for their
specific environment.
© Copyright Lenovo 2011
167
Electronic emissions notices
For electronic emission information on Class B digital devices, refer to the corresponding information in
the User Guide.
168
ThinkPad T420 and T420i Hardware Maintenance Manual
Trademarks
The following terms are trademarks of Lenovo in the United States, other countries or both:
Active Protection System
Lenovo
ThinkLight
ThinkPad
ThinkVantage
TrackPoint
Ultrabay
The following terms are trademarks of Microsoft group of companies:
Windows
Microsoft
The following terms are trademarks of Intel Corporation or its subsidiaries in the United States, other
countries, or both:
Intel
Intel Centrino
Intel Core
Other company, product, or service names may be the trademarks or service marks of others.
Appendix A. Notices
169
170
ThinkPad T420 and T420i Hardware Maintenance Manual
Part Number: 0A60007_03
(1P) P/N: 0A60007_03
*0A60007_03*
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