Apple iMac USB 2.0 Specifications

 Service Source
iMac (USB 2.0)
Updated 6 July 2005
© 2004 Apple Computer, Inc. All rights reserved.
iMac (USB 2.0)
-1
 Service Source
Basics
iMac (USB 2.0)
© 2004 Apple Computer, Inc. All rights reserved.
Overview
The iMac (USB 2.0) computers are powered by the PowerPC G4 processors. Three
models are available: the 20-inch widescreen LCD (1.25 GHZ), the 17-inch widescreen
LCD (1.25 GHZ), and the 15-inch LCD flat screen (1 GHz). The computer also includes
80GB hard drives, 256MB DDR333 SDRAM, two FireWire 400 ports and three USB 2.0
ports.
How to identify these models
Verify the processor speed. If the system is up and running, select “About this Mac” under
the Apple icon in the Finder. Or, select the “More Info” button on the “About this Mac”
window. Apple System Profiler opens and displays the machine speed under “Hardware
Overview.” The 15-inch iMac has a 1GHz PowerPC G4 processor and the 20-inch and 17inch iMac have a 1.25GHz PowerPC G4 processor. In addition, identify these models by
their serial number.
Overview
iMac (USB 2.0) Basics - 1
What’s New
New Features, November 2003
The new 20-inch iMac (USB 2.0) has:
• a built-in 20-inch widescreen flat-panel
• a PowerPC G4 with a clock speed of 1.25 GHz
• NVidia GeForce FX5200 Ultra graphics acceleration
• SuperDrive
New Service Parts for the 20-inch iMac (USB 2.0)
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Rear Housing, 922-6138
Rear Housing screws, 922-6219
Inverter 922-6129
Inverter screws, 922-6218
LCD Display Panel, 20-inch, 661-2991
WIre Deflector, 922-6213
Display Bezel 922-6128
Display Bezel screws, 922-6289
Neck Extension, 661-2990
Chassis, Faraday, 922-6204
Power Supply, 661-3104
Drive Carrier, 922-6216
Hard Drive, 80 GB, 661-3106
Hard Drive, 160 GB, 661-3107 (CTO only)
SuperDrive, 661-3108
Logic Board, 1.25 GHz, 661-2989
Bottom Housing, 922-6288
Fan, 922-6215
Insulators: Rear: 922-6217; Front: 922-6214
SDRAM, 256 MB, DDR333, SODIMM, 661-3147
SDRAM, 256 MB, DDR333, 184-pin, 661-3145
SDRAM, 512 MB, DDR333, 184-pin, 661-3146
2 - iMac (USB 2.0) Basics
What’s New
Standard Configurations
Features
What’s New
15-inch
17-inch
20-inch
CPU and speed
1GHz PowerPC G4
1.25GHz PowerPC G4
1.25GHz PowerPC G4
System bus
speed
167 MHz
167 MHz
167 MHz
Main memory
256 MB, 333 MHz
DDR SDRAM,
expandable up to 1
GB
256 MB, 333 MHz
DDR SDRAM, expandable up to 1 GB
256 MB, 333 MHz
DDR SDRAM, expandable up to 1 GB
Display
15-inch flat panel
17-inch, wide-screen
flat panel
20-inch, wide-screen
flat panel
Graphics IC
NVIDIA GeForceMX
NVIDIA GeForce FX
5200 Ultra
NVIDIA GeForce FX
5200 Ultra
Graphics memory
32 MB DDR RAM
64 MB DDR RAM
64 MB DDR RAM
Hard disk drive
80 GB Ultra ATA-66
7200 rpm
80 GB Ultra ATA-66
7200 rpm
80 GB Ultra ATA-66
7200 rpm
Optical drive
Tray-load Combo
drive
Tray-load SuperDrive
Tray-load SuperDrive
Power Supply
160 W
160 W
190 W
External monitor adapter
Mini-VGA or Svideo/composite
Mini-VGA or S-video/
composite
Mini-VGA or S-video/
composite
Communication
features
10/100 Ethernet;
56K V.92 fax modem
10/100 Ethernet; 56K
V.92 fax modem
10/100 Ethernet; 56K
V.92 fax modem
Wireless features
Optional 54 Mbps
AirPort Extreme
Card; optional internal Bluetooth
Optional 54 Mbps AirPort Extreme Card;
optional internal Bluetooth
Optional 54 Mbps AirPort Extreme Card;
optional internal Bluetooth
iMac (USB 2.0) Basics - 3
Serial Number Location
To identify a particular model of iMac (USB 2.0), check the computer’s serial number,
which lists the model’s configuration. The serial number is located on the bottom of the
computer, on the metal access plate, or on the inside of the optical drive door (bottom
photo).
4 - iMac (USB 2.0) Basics
Serial Number Location
Serial Number Location
iMac (USB 2.0) Basics - 5
 Service Source
Take Apart
iMac (USB 2.0)
© 2004 Apple Computer, Inc. All rights reserved.
General Information
Overview: November 2003
This Take Apart chapter includes take apart procedures for the 15-inch, the 17-inch, and
the 20-inch iMac (USB 2.0) computers. New procedures for the 20-inch iMac (USB 2.0)
are listed below.
New Procedures
The following Take Apart sections were updated:
• 20-inch model: Display panel, inverter, back cover, and the neck assembly
• Replacement instructions to add copper tape on the inside of the Faraday cage when
you replace the antenna board on any of these models.
• Replacement instructions for EMI gaskets on the 20-inch panel
Tools
The following tools are recommended for the take apart procedures.
• The service stand (076-0898)
• Thermal paste (922-4757)
• Torque driver, 17" LB (076-0899)
• 1.5 mm hex driver (for LCD bezel screws)
• #0 Phillips screwdriver)
• Torx screwdriver set (6, 8, 10, 15)
• Plastic flatblade screwdriver or stylus (922-5065)
• Needlenose pliers
• ESD wriststrap and mat
General Information
iMac (USB 2.0) Take Apart - 1
Service Stand
1. Support the computer by neck and the base (A). Gently position the computer in the
service stand with the flat panel facing up (B).
2.
Note: The base of the computer can be rotated when servicing internal parts.
2 - iMac (USB 2.0) Take Apart
General Information
User Access Plate
Tools
This procedure requires the following tools:
• Phillips #0 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
User Access Plate
iMac (USB 2.0) Take Apart - 3
Procedure
1. Loosen the four captive screws on the access panel.
2. Remove the panel by grabbing onto two captive screws and lift the panel off the base.
4 - iMac (USB 2.0) Take Apart
User Access Plate
AirPort Extreme Card
Tools
This procedure requires no tools.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
AirPort Extreme Card
iMac (USB 2.0) Take Apart - 5
Procedure
1. Unplug all cables from the computer except the power cord.
2. Important: To avoid electrostatic discharge, always ground yourself by touching
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room until
you have completed the installation and closed the computer.
3. Touch a metal surface inside the computer to ground yourself.
4. Unplug the power cord.
5. Pull the plastic tab on the AirPort Extreme card to remove it from the slot. Disconnect
the AirPort antenna from the card.
6 - iMac (USB 2.0) Take Apart
AirPort Extreme Card
Memory, SO-DIMM (userinstallable)
Tools
No tools are required for this procedure.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
Note: DIMMs used in this slot should be a low-profile PC2700 (DDR333) SO-DIMM. Only
the SO-DIMM slot is accessible by the user.
Memory, SO-DIMM (user-installable)
iMac (USB 2.0) Take Apart - 7
Procedure
1. Unplug all cables from the computer except the power cord.
2. Important: To avoid electrostatic discharge, always ground yourself by touching
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room until
you have completed the installation and closed the computer.
3. Touch a metal surface inside the computer to ground yourself.
4. Unplug the power cord.
5. Release the memory by spreading apart the tabs in the expansion slot from the
notches in the card.
8 - iMac (USB 2.0) Take Apart
Memory, SO-DIMM (user-installable)
6. Allow the memory to pop up slightly, and pull it out of the memory slot.
Memory, SO-DIMM (user-installable)
iMac (USB 2.0) Take Apart - 9
Bottom Housing
Tools
This procedure requires the following tools:
• Torx-15 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
10 - iMac (USB 2.0) Take Apart
Bottom Housing
Procedure
1. When opening the bottom housing, rotate the base so the optical drive door is on the
right. (This position is less stressful on the internal cables when the bottom is open).
2. Remove the four torx screws. Note: The bottom housing on the 20-inch iMac (USB
2.0) display has a different part number (922-6288) from the bottom housing (9225804) used on the 15-inch and the 17-inch iMac (USB 2.0) computers. Exchange
them like-for-like.
Replacement Note: These torx screws must be tightened to at least 17 in.-lbs. If you do
not have a torque driver, you will have to make sure these screws are tightened by hand
FIRMLY, BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure
the thermal pipe is firmly mated with the top base. If the bottom housing is not securely
attached to the base in this fashion, the CPU may overheat and become damaged. For
more information, refer to “Thermal Paste Application’” in this chapter. Rotate the base so
that the optical drive door is on the right.
iMac (USB 2.0) Take Apart - 11
3. Gently open the bottom housing in the direction of the arrow. Disconnect the cables.
12 - iMac (USB 2.0) Take Apart
4. Disconnect the following:
A Grounding screw
B Bluetooth connector (if Bluetooth board is present, this will be connected)
C AirPort connector
D AC line filter connector
E TMDS video connector
F Inverter, speaker, fan connector
G Optical cable and connector
H Hard drive cable and connector
I Power Supply connector
iMac (USB 2.0) Take Apart - 13
5. Set the bottom housing aside. Note: Before returning the bottom housing to Apple,
remove the logic board, modem, RJ-11 board, memory, Bluetooth board (if present),
antenna, AirPort Extreme card (if present), and the I/O port covers.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
14 - iMac (USB 2.0) Take Apart
Thermal Paste Application
Tools
This procedure requires the following tools:
• Plastic stylus or plastic spatula to remove the old thermal paste
• Plastic stylus or plastic spatula to spread the thermal paste
• Thermal paste (922-4757)
Part Location
Thermal Paste Application
iMac (USB 2.0) Take Apart - 15
Procedure
1. Thoroughly clean the original thermal film from the mating surfaces (circled below) of
the bottom housing and thermal pipe. Use a plastic stylus to scrape the surfaces
clean. Note: Do not use an abrasive material or liquid cleaner.
2. Squeeze a ball of thermal paste onto the mating surfaces of the thermal pipe.
16 - iMac (USB 2.0) Take Apart
Thermal Paste Application
3. Replace the bottom housing.
Warning: The bottom housing has four torx screws that must be tightened to at least
17 in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe
is firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to apply the thermal paste as described in this procedure, and failure to
tighten the torx screws as directed, could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Thermal Paste Application
iMac (USB 2.0) Take Apart - 17
RJ-11 Modem Filter Board
Tools
This procedure requires the following tools:
• Torx-6 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
18 - iMac (USB 2.0) Take Apart
RJ-11 Modem Filter Board
Procedure
1. Remove two screws and disconnect the cable from the modem.
2. Remove the RJ-11 board from the I/O port.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
RJ-11 Modem Filter Board
iMac (USB 2.0) Take Apart - 19
Modem
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
20 - iMac (USB 2.0) Take Apart
Modem
Procedure
1. Remove two screws and disconnect the cable.
2. Lift the modem board from the connector on the logic board.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Modem
iMac (USB 2.0) Take Apart - 21
Memory (factory-installed)
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
22 - iMac (USB 2.0) Take Apart
Memory (factory-installed)
Procedure
1. Push down on the ejector tabs to release the memory module.
2. Pull the memory up and out of the slot. Important: Make sure that the memory
installed on the logic board is compatible with the system. The computer accepts
double-data rate (DDR) SDRAM DIMMs. DIMMs used in this slot must fit the following
specification: PC2700 SDRAM DDR333 DIMMs for 167 MHz systems.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Memory (factory-installed)
iMac (USB 2.0) Take Apart - 23
Battery
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
24 - iMac (USB 2.0) Take Apart
Battery
Procedure
1. Using a flatblade screwdriver, gently pry the battery from the battery holder.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Battery
iMac (USB 2.0) Take Apart - 25
Logic Board
Tools
This procedure requires the following tools:
• Phillips #2 screwdriver (for the plastic screw)
• Torx-15 screwdriver
Part Location
Note: The battery, RJ-11 board, AirPort Extreme card, modem, I/O port covers, memory
(on the top and the bottom of the logic board), Bluetooth board and the Bluetooth
extension cable need to be removed from the logic board before returning the board to
Apple for service.
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
26 - iMac (USB 2.0) Take Apart
Logic Board
Procedure
1. Remove the three torx screws (metal) and one plastic screw.
Logic Board
iMac (USB 2.0) Take Apart - 27
2. Grab the logic board by the battery retainer and the hard drive connector. Lift the
board slightly and pull back to release the board from the bottom housing and I/O
ports. Note: The I/O port covers may come out with the logic board when it’s
removed.
3. Remove the I/O port covers from the logic board.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
28 - iMac (USB 2.0) Take Apart
Logic Board
Bluetooth Board and Cable
Tools
This procedure requires the following tools:
• Phillips #2 jeweler’s screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
• Remove the logic board.
Bluetooth Board and Cable
iMac (USB 2.0) Take Apart - 29
Procedure
1. Ground yourself. Remove the AirPort Extreme card and SO-DIMM memory (if
present).
2. Remove the logic board protective cover to access the Bluetooth board
30 - iMac (USB 2.0) Take Apart
Bluetooth Board and Cable
3. Remove the two screws (circled below) on the Bluetooth board.
4. Peel the Kapton tape off the Bluetooth extension cable. Disconnect the extension
cable from the Bluetooth board. Note: The Bluetooth wireless extension cable is a
separate service part from the Bluetooth board.
5. Lift the Bluetooth board from the connector on the logic board.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Bluetooth Board and Cable
iMac (USB 2.0) Take Apart - 31
I/O Port Covers
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board
• Remove the logic board.
32 - iMac (USB 2.0) Take Apart
I/O Port Covers
Procedure
1. Gently pull the I/O port covers off the logic board.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
I/O Port Covers
iMac (USB 2.0) Take Apart - 33
AirPort Antenna Extension
Cable
Tools
This procedure requires the following tools:
• No tools are required
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board
• Remove the logic board.
34 - iMac (USB 2.0) Take Apart
AirPort Antenna Extension Cable
Procedure
1. Release the extension cable from the plastic cable clips to remove the cable from the
bottom housing.
Replacement Note: Be careful not to pinch the antenna extension cable when
replacing it.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
AirPort Antenna Extension Cable
iMac (USB 2.0) Take Apart - 35
Thermal Pad Installation
Tools
• No tools are required.
• Thermal pad kit (076-0925)
Part Location
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to two surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively.
36 - iMac (USB 2.0) Take Apart
Thermal Pad Installation
Procedure
1. Remove the old thermal pads from the bottom housing. Note: If you don’t see the two
thermal pads on the bottom housing, check the under side of the logic board. The
thermal pads may stick to the logic board. Always remove the old thermal pads, and
install new pads if you are taking the unit apart to this level.
2. Using the thermal pad kit, remove the clear protective backing from the new thermal
pads.
3. Place the new thermal pads on the bottom housing. Press down on the blue protective
backing to make sure the thermal pad has even contact with the bottom housing.
There should be no air pockets.
4. Remove the blue protective backing from the new thermal pad. Note: Avoid
unnecessary contact with either side of the thermal pad as dirt and body oils reduce
the thermal pad's conductivity.
5. Slide the logic board back into the bottom housing (make sure the I/O port covers are
on the logic board).
Thermal Pad Installation
iMac (USB 2.0) Take Apart - 37
AC Line Filter
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the RJ-11 board.
• Remove the logic board.
38 - iMac (USB 2.0) Take Apart
AC Line Filter
Procedure
1. Peel the black insulator on the bottom housing back to access the AC line filter
screws.
2. Remove two screws and lift the AC line filter from the bottom housing. Note: The port
plug may fall out of the AC filter port when you remove the AC line filter. Replace the
plug into the opening on the bottom housing before reinstalling the AC line filter.
AC Line Filter
iMac (USB 2.0) Take Apart - 39
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Warning: Whenever the logic board is separated from the bottom housing, you must
install new thermal pads to three surfaces on the bottom housing. Failure to apply these
pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat and could damage internal components.
Note: AFTER installing new thermal pads, if you must briefly re-separate the logic board
from the housing, it is OK to retain the same, new pads as long as they are not handled
excessively. Refer to “Thermal Pad Installation” in this chapter for detailed information.
40 - iMac (USB 2.0) Take Apart
AC Line Filter
Drive Carrier Assembly (Optical
and Hard Drive)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand with the door facing up.
• Remove the user access plate.
• Remove the bottom housing.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 41
Procedure
1. Rotate the base unit so the optical drive door is facing to the right.
2. Remove six screws; two on the EMI shield (with copper tape) and four attaching the
drive to the Faraday cage (chassis). Carefully lift the shield and copper tape off the
drive. Replacement Note: When replacing the drive EMI shield, be sure to use the
two shorter screws.
42 - iMac (USB 2.0) Take Apart
Drive Carrier Assembly (Optical and Hard Drive)
3. Remove the Airport and Bluetooth antennas from the plastic clip on the side of the
drive carrier.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 43
4. Grasp the carrier by the top and bottom edges. Wiggle the drive carrier out of the
chassis pulling the carrier in the direction of the arrow. Note: The carrier fits snugly
into the chassis.
5. Disconnect the two power cables; one attaches to the optical drive and the other
attaches to the hard drive.
44 - iMac (USB 2.0) Take Apart
Drive Carrier Assembly (Optical and Hard Drive)
6. To remove the hard drive from the carrier, peel the white wrapper up to access the
screws (two on each side). Remove the screws, disconnect the data cable, and
remove the hard drive out of the carrier.
7. To remove the optical drive, remove four screws (shown by dashed lines), disconnect
the optical drive data cable (see lower arrow), and slide the optical drive out of the
carrier.
Drive Carrier Assembly (Optical and Hard Drive)
iMac (USB 2.0) Take Apart - 45
8. Note: The drive carrier on the 20-inch iMac (USB 2.0), 922-6216, is different from the
drive carrier used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The 20inch iMac (USB 2.0) drive carrier is shown below.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
46 - iMac (USB 2.0) Take Apart
Power Supply
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand and rotate the door to the right.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
Power Supply
iMac (USB 2.0) Take Apart - 47
Procedure
1. Remove the two power supply screws circled below.
48 - iMac (USB 2.0) Take Apart
Power Supply
2. Open the optical drive door as shown. Support the metal plate and power supply as
you remove the four screws.
Important: The two screws near the door hinge are shorter than the other power
supply screws. Failure to replace the shorter screws into their correct location will
scratch the top housing. See step 4, Replacement Note.
Power Supply
iMac (USB 2.0) Take Apart - 49
3. Lift the power supply and metal shield out of the chassis (Faraday cage).
4. Note: The power supply on the 20-inch iMac (USB 2.0), 661-3104, is different from
the power supply used on the 15-inch and the 17-inch iMac (USB 2.0) computers. The
20-inch iMac (USB 2.0) power supply is shown below.
50 - iMac (USB 2.0) Take Apart
Power Supply
5. Replacement Note: When replacing the metal shield (see picture above) that sits on
top of the power supply, install the two shorter screws near the optical door. If the
longer screws are installed by mistake, the screws will scratch the inside of the
housing (circled below).
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Power Supply
iMac (USB 2.0) Take Apart - 51
Optical Drive Door
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
• Needlenose pliers
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
52 - iMac (USB 2.0) Take Apart
Optical Drive Door
Procedure
1. Remove four screws on the power supply shield. Set the shield aside.
Important: The two screws near the door hinge are shorter than the other power
supply screws. Failure to replace the shorter screws to their correct location will
scratch the top housing. See the Power Supply topic, step 4, Replacement Note, for a
picture of what happens when the wrong screws are inserted in the wrong location.
Optical Drive Door
iMac (USB 2.0) Take Apart - 53
2. Slide the optical door guide off the chassis and the door hinge tabs (circled).
3. Carefully remove the two door springs with a needlenose pliers.
54 - iMac (USB 2.0) Take Apart
Optical Drive Door
4. Remove the door hinge screws.
5. Open the door.
Optical Drive Door
iMac (USB 2.0) Take Apart - 55
6. Slide the door and hinge off the chassis.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
56 - iMac (USB 2.0) Take Apart
Optical Drive Door
Speaker, Internal
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
Speaker, Internal
iMac (USB 2.0) Take Apart - 57
Procedure
1. Loosen the two screws enough to slide the speaker off the metal posts. Disconnect
the speaker cable.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
58 - iMac (USB 2.0) Take Apart
Speaker, Internal
Fan
Tools
This procedure requires the following tools:
• Torx-15 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
Fan
iMac (USB 2.0) Take Apart - 59
Procedure
1. Remove the two fan screws and disconnect the fan connector.
2. Pull the fan out of the chassis (Faraday cage). Note: The replacement fan includes the
mounting bracket.
3. Note: The fan on the 20-inch iMac (USB 2.0), 922-6215, is different (identify by the
amps highlighted below) from the fan used on the 15-inch and the 17-inch iMac (USB
2.0) computers. The 20-inch iMac (USB 2.0) fan is shown below.
60 - iMac (USB 2.0) Take Apart
Fan
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Fan
iMac (USB 2.0) Take Apart - 61
Power Supply Insulators
Tools
No tools are required for this procedure.
Part Location
Note: Insulator color and transparency may vary from those shown above.
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
62 - iMac (USB 2.0) Take Apart
Power Supply Insulators
Procedure
1. Carefully pull the insulators from the chassis (Faraday cage). These are attached to
the chassis with double-sided tape.
2. Note: The insulators on the 20-inch iMac (USB 2.0), 922-6217 and 922-6214, are
different from the insulators used on the 15-inch and the 17-inch iMac (USB 2.0)
computers.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Power Supply Insulators
iMac (USB 2.0) Take Apart - 63
Fan Retainer Bracket (under fan)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
64 - iMac (USB 2.0) Take Apart
Fan Retainer Bracket (under fan)
Procedure
1. Remove the four screws connecting the fan bracket to the chassis (Faraday cage).
2. Lift the fan bracket out of the chassis. Note the orientation of the neck cables (see
below) in the fan bracket before removing the cables. For orientation purposes, the
drive door would be on the right.
Fan Retainer Bracket (under fan)
iMac (USB 2.0) Take Apart - 65
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
66 - iMac (USB 2.0) Take Apart
Fan Retainer Bracket (under fan)
Fan Gasket
Tools
No tools are required for this procedure.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
• Remove the fan retainer bracket.
Fan Gasket
iMac (USB 2.0) Take Apart - 67
Procedure
1. Remove the fan retainer bracket and turn it over. Gently peel the fan gasket off the
back of the fan bracket.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
68 - iMac (USB 2.0) Take Apart
Fan Gasket
Cap, Neck Spoke Retainer
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the fan.
Cap, Neck Spoke Retainer
iMac (USB 2.0) Take Apart - 69
Procedure
1. Before removing the neck cap screws, note the cable routing, including the location of
the empty spoke.
2. Note: There are five screws on the neck cap. For this step, remove only the three
silver screws and the neck cap. (The two black screws secure the neck to the base.)
70 - iMac (USB 2.0) Take Apart
Cap, Neck Spoke Retainer
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Cap, Neck Spoke Retainer
iMac (USB 2.0) Take Apart - 71
Chassis (Faraday Cage)
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
• Torx-8 screwdriver for the logo screw
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
72 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
•
•
•
•
Remove the power supply.
Remove the fan.
Remove the plastic cable retainer (under the fan).
Remove the neck spoke retainer cap.
Procedure
1. Pull the neck cables/white spokes out of their slots and into a bundle. Bundle the neck
cables to one side. Supporting the base, remove the two black screws that connect
the neck to the Faraday base.
Chassis (Faraday Cage)
iMac (USB 2.0) Take Apart - 73
2. Carefully feed the neck cables through the hole in the Faraday cage. Important: The
Faraday cage is very heavy and has sharp edges; handle with care.
74 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
3. Pull the outer shell (with Faraday attached) away from the neck.Note: There is no
need to remove the outer shell from the Faraday unless you are replacing the antenna
or the outer shell. If you are removing the shell from the Faraday cage, go on to the
next step.
4.
Perform the next step only if you are replacing the Faraday, the antenna, or the outer
shell.
5. Remove one screw in the base of the Faraday cage to separate the shell from the
Faraday cage. Note: The Faraday cage on the 20-inch iMac (USB 2.0), 922-6204, is
heavier and different from the Faraday cage used on the 15-inch and the 17-inch iMac
(USB 2.0) computers.
Chassis (Faraday Cage)
iMac (USB 2.0) Take Apart - 75
Replacement Notes:
Faraday cage: Look at the exploded view diagram during reassembly. First, attach the
Faraday top cover to the top (OUTSIDE) of the Faraday cage as shown below; the
Faraday top cover is keyed. Next, thread the neck cables through the hole in the Faraday
cage and install the Faraday cage into the top plastic housing. Replace the screw that
holds the plastic housing to the chassis. Attach the black neck cap screws to connect the
neck to the chassis. Route the neck cables correctly in the base and replace the fan
bracket retainer and three remaining neck cap screws.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
76 - iMac (USB 2.0) Take Apart
Chassis (Faraday Cage)
Antenna, Wireless
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the optical drive door.
• Remove the internal speaker.
• Remove the fan.
Antenna, Wireless
iMac (USB 2.0) Take Apart - 77
•
•
•
•
Remove the fan bracket under the fan.
Remove the neck spoke retainer cap.
Remove the blind mate connector screws.
Remove the Faraday cage.
78 - iMac (USB 2.0) Take Apart
Antenna, Wireless
Procedure
1. Remove the mounting screw and unclip the board from the Faraday cage. Remove
any tape, and carefully separate the antenna board cable from the Faraday cage.
2. Remove the second mounting screw to unclip the antenna from the Faraday cage.
Antenna, Wireless
iMac (USB 2.0) Take Apart - 79
Replacing the AirPort Antenna
Procedure
1. Attach the replacement antenna to the outside of the Faraday cage. Feed the antenna
wires through the Faraday cage and position the wires against the Faraday cage (as
shown). Note: Make certain the wires lay flat against the Faraday cage.
2. Feed the antenna wires through the hole in the Faraday cage and position the wires
against the Faraday cage (as shown). Make sure that the wires lay flat against the
inside of the Faraday cage.
80 - iMac (USB 2.0) Take Apart
Antenna, Wireless
3. Place the copper tape over the wires making sure the wires lay flat. Press the copper
tape securely against the Faraday cage.
4. Reassemble the computer and return the system to the customer.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
Antenna, Wireless
iMac (USB 2.0) Take Apart - 81
Housing, Outer Shell, Plastic
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the optical drive door.
• Remove the fan.
• Remove the fan bracket under the fan.
82 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
• Remove the neck spoke retainer cap.
• Remove the blind mate connector screws.
Housing, Outer Shell, Plastic
iMac (USB 2.0) Take Apart - 83
Procedure
1. Remove the two black screws that connect the neck to the base.
2. Carefully feed the neck cables through the hole on the vent cap shown below.
84 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
3. Next, carefully separate the outer plastic housing from the neck.
4. Remove one screw in the base of the Faraday cage to separate the white outer shell
from the Faraday cage.
Housing, Outer Shell, Plastic
iMac (USB 2.0) Take Apart - 85
Warning: Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from all thermal interface mating surfaces,
and reapply thermal paste to the mating surfaces on the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17
in.-lbs. Use a torque driver (service tool 076-0899) to ensure that the thermal pipe is
firmly mated with the top base. If you do not have a torque driver, you must make
sure the screws are tightened by hand FIRMLY, BUT NOT FORCIBLY.
Failure to follow these steps could cause the computer to overheat and
damage internal components.
Refer to the topic “Thermal Paste Application” for detailed information.
86 - iMac (USB 2.0) Take Apart
Housing, Outer Shell, Plastic
Display, 20" Flat Panel
Tools
This procedure requires the following tools:
• 1.5 mm hex tool
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 87
Procedure
1. Remove three screws that connect the back cover to the flat panel LCD display. Use
the 1.5 mm hex tool to remove these screws.
2. Support the back cover and push on the display bezel (as shown) to separate the
display bezel from the display’s back panel.
88 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
3. Carefully raise the top side of the display and disconnect the inverter cables (yellow
circles).
Replacement Note: Important: Make sure that the inverter cables (red circles
below) are NOT pinched when the panel is lowered into place.
4. Raise the display a bit more to access the TMDS display connector. Peel back the
black tape.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 89
5. Disconnect the TMDS display connector by squeezing the clips (1) on each side of the
connector and gently pulling the cable (2) out of the slot.
6. Raise the panel all the way up. Disconnect the power on LED cable (on the left).
90 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
7. Disconnect the microphone cable (on the right).
8. Separate the panel from the rear housing/shield.
9. Set the panel face down. Remove the four screws that connect the LCD panel to the
display bezel.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 91
10. Separate the flat panel display from the front bezel
92 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
Replacing the EMI Panel Gaskets
The following instructions explain how to replace the EMI gaskets on the iMac (USB 2.0)
20-inch panel. Note: If the gasket kit (076-1059) does not come with the replacement
panel, remove the gaskets from the defective panel and place them on the new panel.
Tools
• No tools are required unless you are reusing the gaskets. A nylon probe tool would be
required to peel the gaskets off the original panel.
Procedure
1. The iMac (USB 2.0) 20-inch panel (shown below) has EMI gaskets attached to the
top, the back and to both sides of the panel. Important: Gaskets need to be installed
on the replacement panel.
2. Attach the five small EMI gaskets (circled) across the top of the replacement panel.
The black mylar tape shown below is attached last, and is discussed in step 5.
Display, 20" Flat Panel
iMac (USB 2.0) Take Apart - 93
3.
Attach the EMI gasket to the bottom of the display panel (as shown). Repeat for the
top of the display panel.
4. Attach the three gaskets to the side of the panel. Repeat for the other side.
5. Screw the panel to the rear display housing. Connect the panel cables (not shown).
Place the black mylar tape over the TMDS cable (not shown) to hold it securely in
place.
6. Reassemble the rest of the panel. Test the unit before returning it to the customer.
94 - iMac (USB 2.0) Take Apart
Display, 20" Flat Panel
Display, 17" Flat Panel
Tools
This procedure requires the following tools:
• 1.5 mm hex tool
• Torx-10 screwdriver
Important: If you are replacing the 17-inch display panel, be sure to install the display
shield and EMI gaskets that come with the new LCD panel. Installation instructions are
included with the new display panel.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
Display, 17" Flat Panel
iMac (USB 2.0) Take Apart - 95
Procedure
1. Remove three screws that connect the back cover to the flat panel LCD display. Use
the 1.5 mm hex tool to remove these screws.
2. Support the back cover and push on the display bezel (as shown) to separate the
display bezel from the display’s back panel.
96 - iMac (USB 2.0) Take Apart
Display, 17" Flat Panel
3.
Carefully raise the top side of the display and disconnect the inverter cable (A) and
remove the tape holding down the TMDS cable (B).
4. Raise the display a bit more to access the TMDS display connector located behind the
black tape. Peel back the black tape.
Display, 17" Flat Panel
iMac (USB 2.0) Take Apart - 97
5. Disconnect the TMDS display connector by squeezing the clip (1) on each side of the
connector. Gently pull the cable (2) out of the slot.
6. Raise the panel all the way up. Disconnect the power on LED cable (A) and the
microphone cable (B). Set the rear housing/shield aside.
98 - iMac (USB 2.0) Take Apart
Display, 17" Flat Panel
7. Remove four screws that connect the LCD display panel to the display bezel. Also,
remove the kapton tape to release the inverter cables on the left side, and the LED
and microphone cables from the bottom edge of the LCD display.
8. Lift the display panel out of the display bezel.
9. Remove the inverter from the display if you are returning the flat panel display to
Apple. Refer to the “Inverter, 17" Display” take apart procedure in this chapter for
instructions.
Replacement Note: If you are replacing the display, be sure to install the display
shield and EMI gaskets (076-0958) that come with the new LCD panel. Installation
instructions are included with the new display panel.
Display, 17" Flat Panel
iMac (USB 2.0) Take Apart - 99
Replacing the 17"Display Panel
1. After connecting the display cables, position the display into the rear housing. Place
the display into the rear housing, sliding it into position, pushing it in the direction of
the arrows. Note: The display mates with tabs/slots in the rear housing. If the display
doesn’t fit properly and you can’t install the three screws along the bottom of the
housing, check that the display is properly seated in the rear housing.
2. Holding onto the display, turn it over and lay the display face down on a soft cloth.
Push the rear housing in the direction of the arrows. This will mate the housing and
display tabs.
100 - iMac (USB 2.0) Take Apart
Display, 17" Flat Panel
3. Check the alignment of the rear housing and the flat panel display. If the display
doesn’t slide into the tabs/slots on the rear housing, a white line shows across the
back of the rear housing (see below).
4. A properly installed display will have no white line showing across the back of the rear
housing (see below), and the three display-to-housing screw holes align perfectly.
Display, 17" Flat Panel
iMac (USB 2.0) Take Apart - 101
Display, 15" Flat Panel
Tools
This procedure requires the following tools:
• 1.5 mm hex tool
• Plastic stylus to lift the panel
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
102 - iMac (USB 2.0) Take Apart
Display, 15" Flat Panel
Procedure
1. Remove ten screws connecting the back cover to the flat panel LCD display.
2. It is not necessary to remove the two screws circled below unless you are removing
the neck or the panel shield.
Display, 15" Flat Panel
iMac (USB 2.0) Take Apart - 103
3. With a plastic tool, raise the display to access cables underneath the flat panel.
4. Disconnect the inverter cable shown below.
104 - iMac (USB 2.0) Take Apart
Display, 15" Flat Panel
5. Raise the display to disconnect the circled items: The inverter cable, the microphone,
and the power-on LED.
Display, 15" Flat Panel
iMac (USB 2.0) Take Apart - 105
6. This shows a close up of the video cable, ferrite bead, and video cable clip. After
removing the kapton tape, carefully use a screwdriver to pry the ferrite bead from the
video cable clip. Pry the ferrite bead from the side or from the back. Note: The ferrite
bead is fragile and could break if a screwdriver is placed in the middle of the ferrite
bead and is used as leverage to remove the bead.
7. Peel the black tape back to expose the video cable. Gently pull the video cable from
the connector.
106 - iMac (USB 2.0) Take Apart
Display, 15" Flat Panel
8. After disconnecting all the cables, you are left with the 15" LCD flat panel service part
(661-2582).
Display, 15" Flat Panel
iMac (USB 2.0) Take Apart - 107
Inverter, 20" Display
Tools
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Lift the flat panel to access the inverter.
108 - iMac (USB 2.0) Take Apart
Inverter, 20" Display
Procedure
1. Carefully raise the display and disconnect the inverter cables.
2. Remove the four inverter screws (circled below) and disconnect the inverter cable on
the left side of the board.
3. Lift the inverter board off the rear housing.
Inverter, 20" Display
iMac (USB 2.0) Take Apart - 109
Inverter, 17" Display
Tools
Torx-10 screwdriver.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
110 - iMac (USB 2.0) Take Apart
Inverter, 17" Display
Procedure
1. Remove the four panel screws (circled below) to access the inverter on the left side of
the panel.
2. Remove the kapton tape holding the cables in place.
Inverter, 17" Display
iMac (USB 2.0) Take Apart - 111
3. Peel the foil (A) back to access the inverter. Gently pull the inverter (B) off the edge of
the display panel.
112 - iMac (USB 2.0) Take Apart
Inverter, 17" Display
Inverter, 15" Display
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
Inverter, 15" Display
iMac (USB 2.0) Take Apart - 113
Procedure
1. Remove the three screws. Remove the inverter cables from the cable clip. Slide the
inverter in the direction of the arrow.
2. Turn the inverter over and disconnect the third inverter cable.
3. Remove the inverter from the panel shield.
114 - iMac (USB 2.0) Take Apart
Inverter, 15" Display
Panel Shield, 15" Display
Tools
This procedure requires the following tools:
• Torx-8 screwdriver
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
Panel Shield, 15" Display
iMac (USB 2.0) Take Apart - 115
Procedure
1. Remove the three T-8 screws on the metal cable retainer. Lift the cable retainer off the
panel shield.
2. Remove the four T-10 screws in the center of the panel shield. Next, release the
cables from the metal clips on the panel shield.
116 - iMac (USB 2.0) Take Apart
Panel Shield, 15" Display
3. Remove the side screws, then gently maneuver the cables through the hole in the
center of the panel shield.
Panel Shield, 15" Display
iMac (USB 2.0) Take Apart - 117
4. Lift the shield off the back cover being careful not to scratch the white coating on the
back cover.
5. CArefully pull the video cable through the hole in the panel shield.
118 - iMac (USB 2.0) Take Apart
Panel Shield, 15" Display
LED, 20" and 17" Displays
Note: Do not remove the LED from the bezel. The LED is part of the display bezel and
cannot be ordered separately.
Part Location
Preliminary Steps
Before you begin, do the following:
• Remove the flat panel display.
LED, 20" and 17" Displays
iMac (USB 2.0) Take Apart - 119
Microphone, 20" and 17"
Displays
Note: Do not remove the microphone from the bezel. The microphone is part of the
display bezel and cannot be ordered separately.
Part Location
Preliminary Steps
Before you begin, do the following:
• Remove the flat panel display.
120 - iMac (USB 2.0) Take Apart
Microphone, 20" and 17" Displays
Back Cover, 20" Display
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
• Remove the inverter board.
• Disconnect the microphone and LED cables
Back Cover, 20" Display
iMac (USB 2.0) Take Apart - 121
Procedure
1. Remove the three screws on the wire deflector Lift the wire deflector off the back
cover.
2. Peel the rubber pads off the back cover and set them aside temporarily. Replacement
Note: Before replacing the back cover or LCD panel, press the rubber pads back into
the grooves on the shield before closing the panel.
122 - iMac (USB 2.0) Take Apart
Back Cover, 20" Display
3. Remove the last screw and gently feed the neck cables through the hole. Note: If the
iMac is laying in the repair fixture, support the base of the computer when removing
the screw shown below. This screw holds the neck to the back cover and the computer
is unbalanced when the panel is removed.
4. Align the TMDS connector with the notches and carefully feed the cable through the
hole.
Back Cover, 20" Display
iMac (USB 2.0) Take Apart - 123
5. Lift the back cover off the neck extension.
124 - iMac (USB 2.0) Take Apart
Back Cover, 20" Display
Back Cover, 17" Display
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
Back Cover, 17" Display
iMac (USB 2.0) Take Apart - 125
Procedure
1. Note the location of the inverter (A),TMDS (B), microphone (C), and LED (D) cables.
Remove four screws that secure the metal wire deflector and the base assembly to the
back cover. Remove the metal wire deflector.
2. Remove the tape from the neck cables. Pull the cables through the hole in center of
the back cover. Note: The hole in the back cover is notched; align the wide TMDS
connector with the notches.
126 - iMac (USB 2.0) Take Apart
Back Cover, 17" Display
Back Cover, 15" Display
Tools
No tools are required.
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the flat panel display.
• Remove the panel shield.
Back Cover, 15" Display
iMac (USB 2.0) Take Apart - 127
Procedure
1. Lift the display cover off the neck assembly.
128 - iMac (USB 2.0) Take Apart
Back Cover, 15" Display
Neck Extension Identification
There are many neck assemblies and display panels for the iMac (Flat Panel) computers.
Identify which neck assembly belongs in the system by the 620-xxxx tag attached to the
TMDS cable (circled below). Refer to the Neck Identification table on the next page for
more information.
Neck Extension Identification
iMac (USB 2.0) Take Apart - 129
Neck Identification Table
Table 1: Neck Identification
Product
Use with
Display
Neck Part Number
Neck Label 620-xxxx
iMac (Flat
Panel) 15",
700 MHz/800
MHz
661-2585
No Label on this neck
iMac (17" Flat
Panel), 800
MHz
661-2716
620-2122
661-2715
iMac (17" Flat
Panel, 1GHz)
661-2825
620-2675
661-2715d
iMac (USB
2.0) 15", 1
GHz
661-2969, LG
661-3021, LG
661-3022, QDI
620-2678
620-2682
620-2681
661-2582, LG
661-3019, LG
661-3020, QDI
iMac (USB
2.0) 20", 1.25
GHz
661-2990
620-2580
661-2991
661-2582
This neck has a blind mate
connector, while later neck
assemblies do not.
and
iMac (USB
2.0) 17", 1.25
GHz
Neck Assemblies KBase Article
For additional information and photos, refer to article 86525: iMac: Flat Panel Neck
Assembly Differences.
130 - iMac (USB 2.0) Take Apart
Neck Extension Identification
Neck Assembly, 20" and 17"
Displays
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
Neck Assembly, 20" and 17" Displays
iMac (USB 2.0) Take Apart - 131
•
•
•
•
•
•
•
•
•
Remove the power supply insulators.
Remove the fan.
Remove the fan bracket.
Remove the neck spoke retainer cap.
Remove the blind mate connector screws.
Remove the Faraday cage.
Remove the outer plastic housing.
Remove the flat panel display.
Remove the back cover
Procedure
1. To remove the neck assembly, follow all the preliminary steps mentioned above. When
you are finished, you will be left with the iMac (USB 2.0) neck assembly. The neck
assemblies for the 20-inch and the 17-inch iMac (USB 2.0) are shown below.
2. The 20-inch neck, 661-2990, can be identified by the part number on the TMDS cable
(circled). The part number should read 620-2580.
3. The 17-inch neck, 661-2825, can be identified by the part number on the TMDS cable
(circled). The part number should read 620-2305
132 - iMac (USB 2.0) Take Apart
Neck Assembly, 20" and 17" Displays
Neck Assembly, 15" Display
Tools
This procedure requires the following tools:
• Torx-10 screwdriver
Part Location
Preliminary Steps
Before you begin, do the following:
• Position the computer in the service stand.
• Remove the user access plate.
• Remove the bottom housing.
• Remove the drive carrier assembly.
• Remove the power supply.
• Remove the power supply insulators.
• Remove the fan.
Neck Assembly, 15" Display
iMac (USB 2.0) Take Apart - 133
•
•
•
•
•
•
•
Remove the plastic cable retainer (under the fan).
Remove the cap spoke holder.
Remove the blind mate connector screws.
Remove the Faraday cage.
Remove the flat panel display.
Remove the panel shield.
Remove the back cover
Procedure
The neck assembly (661-2969) for the 15-inch iMac (USB 2.0) computer is shown below. It
can be identified by the part number on the TMDS cable (circled). The part number should
read 620-2384.
134 - iMac (USB 2.0) Take Apart
Neck Assembly, 15" Display
Neck Assembly, 15" Display
iMac (USB 2.0) Take Apart - 135
 Service Source
Troubleshooting
iMac (USB 2.0)
© 2003 Apple Computer, Inc. All rights reserved.
General Information
Overview:
How do you identify the different models?
1. Identify the different models by their serial number. Search for the serial number in GSX (Global Service
Exchange) under the “Parts Lookup” or search in the Service Parts Database.
2. Identify the processor speed. If the system is up and running, select “About this Mac” under the Apple
icon in the Finder. Or, select the “More Info” button on the “About this Mac” window. Apple System
Profiler opens and displays the machine speed under “Hardware Overview.” The 15-inch iMac has a
1GHz PowerPC G4 processor and the 17-inch and 20-inch iMac have a 1.25GHz PowerPC G4
processor.
3. Identify the various neck assemblies by referring to the topic “Neck Extension Identification” in Take
Apart, or by referring to the Knowledge Base article 86525, “iMac: Flat Panel Neck Assembly
Differences”.
4. These computer models uses double-data rate (DDR) memory; PC2700 DDR333. Memory from
previous iMac models is not compatible with this computer. Do not use older SDRAM DIMMs or SODIMMs even if they fit into the slot. Make sure to use PC2700 DDR333 low profile SO-DIMMs in the userinstallable slot. The iMac memory pinouts are 184-pin internal, and 200-pin on the user-installable slot.
Important Things to Remember:
Service items that still apply to all flat-panel iMac computers:
1. Diagnostic test points are on to the logic board. They are accessed through the user access door. Use
the test points to check the following:
• Battery
• 5V
• 12VSLP
• 12V
For more information, refer to the “Logic Board Battery” and “No Power” topics later in this
chapter.
2. Important: The CPU uses a thermal pipe to transfer heat away. This pipe makes a thermal connection to
the top metal chassis (Faraday cage) at two locations. These connecting points must be cleaned and
have new thermal paste applied each time the bottom housing is removed. If the mating surfaces are not
cleaned and thermal paste is not used, the CPU may overheat and become damaged. There is no
exception to this. Note: Most service procedures require that the bottom housing is removed.
Refer to “Thermal Paste Application” mentioned later in this chapter or in the Take Apart
chapter.
General Information
iMac (USB 2.0) Troubleshooting - 1
3. Whenever the17-inch LCD display (661-2715) is replaced, a display shield/gasket kit (076-0958) must
be installed on the new panel. Instructions for installing the shield/gasket kit are included with the new
LCD panel.
4. The LED and microphone are part of the 17-inch display bezel (922-5297); they cannot be ordered
separately.
5. The LED functions differently on the iMac (17-inch Flat Panel). The LED does not light up when the
power is on; however, the LED should pulse when the computer is in Sleep mode.Important: If you are
replacing the display, be sure to install the new display shield and EMI gaskets that come with the new
LCD panel. Installation instructions are included with the new display panel. Additional display shields/
gasket kits are also available separately as a kit, part number 076-0958.
6. Important: Whenever the logic board is separated from the bottom housing, you must install new
thermal pads to two surfaces on the bottom housing. The thermal pads help cool components on the
logic board. Failure to apply these pads whenever the logic board is separated from the bottom
housing could cause these parts to overheat. Short term separation, where the thermal pads are not
handled excessively ( an exception would be if you are simply testing the logic board and only detach it
for a few minutes), does not require replacement. Refer to “Thermal Pad Installation” in this chapter for
detailed information.
Refer to the Take Apart chapter, “Thermal Pad Installation.”
7.
Whenever the bottom housing is opened for service, you must do two things:
1.You must clean the original thermal film from the surfaces joining the thermal interface layer and
reapply thermal paste to the thermal pipe.
2. You must tighten the four torx screws on the bottom housing to a minimum of 17 in.-lbs. If you do
not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY,
BUT NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is
firmly mated with the top base. If the bottom housing is not securely attached to the base in this
fashion, the CPU may overheat and become damaged. Failure to follow either of these steps could
cause the computer to overheat and damage internal components.
Refer to the topic, “Thermal Paste Application” for detailed information.
8. A service stand, 076-0898, is available from Apple Service to hold the unit while you service the
computer.
2 - iMac (USB 2.0) Troubleshooting
General Information
Logic Board, Top
General Information
iMac (USB 2.0) Troubleshooting - 3
Logic Board, Bottom
4 - iMac (USB 2.0) Troubleshooting
General Information
I/O Ports
The PMU Chip
The PMU (Power Management Unit) is a microcontroller chip that controls all power functions for
the computer. The PMU (location shown below) is a computer within a computer. It has memory,
software, firmware, I/O, two crystals, and a CPU. Its function is to:
• Tell the computer to turn on, turn off, sleep, wake, idle, etc.
• Manage system resets from various commands.
• Maintain parameter RAM (PRAM).
• Manage the real-time clock.
Important: The PMU is very sensitive and touching the circuitry on the logic board can cause the
PMU to crash. If the PMU crashes, the battery life goes from about five years to about two days if
the PMU is not reset. Refer to the next topic, “Resetting the PMU on the Logic Board” for the
procedure.
Many system problems can be resolved by resetting the PMU chip.
Location of the PMU Button
General Information
iMac (USB 2.0) Troubleshooting - 5
Resetting the PMU on the Logic Board
Resetting the PMU (Power Management Unit) on the logic board can resolve many system
problems. Whenever you have a unit that fails to power up, you should follow this procedure
before replacing any modules.
1. Disconnect the power cord.
2. Remove the user access panel from the bottom of the computer.
3. Press the PMU reset switch (located under the protective cover, next to the test points) once on the
bottom side of the logic board and then proceed to step 3. Do NOT press the PMU reset switch a
second time because it could crash the PMU chip.
4
WAIT ten seconds before connecting the power cord and powering the computer on. If the
computer powers on, go to the next step. If the computer does not power on, there is
something else wrong with the computer, refer to the symptom/cure, “No Power” in this
chapter.
5. Run Apple Service Diagnostic or Apple Hardware Test for the iMac (USB 2.0) models and
return the computer to the customer.
Note: This entire procedure resets the computer’s PRAM. Be sure to reset the computer’s time,
date and other system parameter settings before returning the computer to the customer.
6 - iMac (USB 2.0) Troubleshooting
General Information
Diagnostic Test Points
The iMac has four test points and one ground pad on the bottom of the logic board. These test points are
accessible under the customer access panel via small cutouts in the plastic shielding (see below).
These test points provide an easy troubleshooting tool for common problems. To use each test point, put the
positive probe of your voltmeter on the test point, and the negative probe on the ground pad.
General Information
iMac (USB 2.0) Troubleshooting - 7
Logic Board Battery
Important: Apple highly recommends removing the battery when handling the logic board. Make
sure to use proper ESD protection when handling modules.
The battery on the logic board controls the stored system settings, such as date and time. It is
only necessary to test the battery when you can’t power on the computer, or the date and time are
reset every time the AC power is removed.
The battery is also used to power the PMU chip (because the PMU chip keeps time and must
always be running) when the computer is unplugged from the wall (AC power). The PMU is very
sensitive and touching any circuitry that is connected to the PMU can cause it to crash. If the
PMU crashes, the battery life goes from about five years to about two days if the PMU is not
reset. Once the battery goes dead, the PMU will reset the time and date every time the AC power is
removed. To fix this situation, replace the battery and reset the PMU (refer to “Resetting the
PMU on the Logic Board” mentioned earlier in this chapter).
If the computer has a “No Power” situation, check the battery before replacing modules.
Testing the Battery
1. Remove the user access door on the bottom of the computer.
2. Locate the battery test point.
3. With the computer powered off, measure the battery voltage. Does the battery measure at least +3.5v?
If no, replace the battery and reset the PMU. If the battery measures +3.5v or higher, reinstall the
battery and reset the PMU as above.
8 - iMac (USB 2.0) Troubleshooting
General Information
4. Connect the power cord and power up the system again.
Warning: Whenever the bottom housing is opened for service, you must do two things:
1. You must clean and reapply thermal paste to the thermal pipe surface.
2. You must tighten the four torx bolts on the base unit to a minimum of 17 in.– lbs. Failure to follow
either of these steps could cause the computer to overheat nd damage internal components.
Refer to the next topic, “Thermal Paste Application” for detailed information.
General Information
iMac (USB 2.0) Troubleshooting - 9
Thermal Paste Application
The following instructions explain how to apply thermal paste to the thermal pipe in the iMac (USB 2.0)
computer. Failure to follow these instructions could cause the computer to overheat and damage internal
components.
Tools
This procedure requires the following tools:
• Plastic stylus or plastic spatula to remove the old thermal paste
• Plastic stylus or plastic spatula to spread the thermal paste
• Thermal paste (922-4757)
Paste Location
10 - iMac (USB 2.0) Troubleshooting
General Information
Procedure
1. Thoroughly clean the original thermal film from the four mating surfaces circled below. Use a plastic
stylus to scrape the surfaces clean. Note: Do not use an abrasive material or liquid cleaner.
2. Squeeze a drop of thermal paste onto the thermal pipe locations circled below.
3. Close the bottom housing.
Warning: The bottom housing has four torx screws that must be tightened to at least 17 in.-lbs. If you do
not have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT
NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is firmly
mated with the top base. If the bottom housing is not securely attached to the base in this fashion, the
CPU may overheat and become damaged.
General Information
iMac (USB 2.0) Troubleshooting - 11
Thermal Pad Replacement Instructions
Whenever the logic board is separated from the bottom housing, you must install new thermal pads to
three surfaces on the bottom housing. The thermal pads help cool components on the logic board. Failure
to apply these pads whenever the logic board is separated from the bottom housing could cause these
parts to overheat. Short term separation, where the thermal pads are not handled excessively ( an
exception would be if you are simply testing the logic board and only detach it for a few minutes), does not
require replacement.
Procedure
1. Remove the old thermal pads (circled below) from the bottom housing. Thoroughly clean the bottom
housing surfaces after removing the pads. Note: If you don’t see all three thermal pads on the bottom
housing, check the bottom side of the logic board.
2. Using the thermal pad kit, remove the clear protective backing from the new thermal pads.
3. Place the new thermal pads in the bottom housing. Note: Avoid unnecessary contact with either side
of the thermal pad as dirt and body oils reduce the thermal pad's conductivity.
4. Press down on the blue protective backing to make sure each thermal pad has even contact with the
bottom housing. There should be no air pockets.
5. Remove the blue protective backing from the new thermal pads.
6. Replace the logic board. Holding the logic board by the battery retainer and the internal drive cable
connector, slide the logic board back into the bottom housing (make sure the I/O port covers are on the
logic board).
12 - iMac (USB 2.0) Troubleshooting
General Information
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the
product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order
presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try
the next cure.
Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
Apple Hardware Test
Apple Hardware Test is a diagnostic tool for detecting problems with Apple internal hardware components
such as logic board, memory, modem, video RAM, and Apple AirPort Card. The test does not check
externally connected hardware components such as USB or FireWire devices; it also does not check nonApple devices such as third-party PCI cards.
Note: The most recent Apple Hardware Test software can be downloaded from the CD Images page on
AppleCare Service Source; go to the Service Source home page and select ‘Disc Images’ from the quickclick table.
Error Codes
If Apple Hardware Test detects a problem with a computer, it displays an error code, which is defined in the
product's Error Code List. Consult the list for appropriate repair procedures associated with the code.
All Error Code Lists are included in the Service Diagnostics Matrix, Knowledge Base article 112125. You can
also access this matrix by clicking the Service Diagnostics rollover link under any of the product areas on the
Service Source home page.
Symptom Charts
iMac (USB 2.0) Troubleshooting - 13
No Power
No fan, no hard drive noise, and the screen is black.
1. Verify the power outlet is good. Plug a different device into the socket to ensure there is power, or plug
computer into another outlet.
2. Check the power cord. Use a known good power cord.
3. Check connection of the power cord on both ends. Verify that the plug is securely plugged into both the
A/C outlet and back of the computer.
4. Remove keyboard, mouse, and other peripherals such as speakers.
5. Disconnect the power cord, place the computer in the service stand, and remove the user access
plate.
6. Reset PMU. Refer to “Resetting the PMU on the Logic Board” mentioned earlier in this chapter.
7. Using a voltmeter, check the voltage on the battery test point (see graphic below). If the reading is over
3.5 volts, go to the next step. If the reading is under 3.5 volts, replace the battery and test again.
8. Plug the unit in, but do NOT press the power button. Using a voltmeter, check the voltage from the test
point marked “12VSLP” (see graphic above). You should get a reading of approximately 12 volts. If the
reading is 12 volts, go to the next step. If you don’t get a 12 volt reading, go to step 11.
9. Press the power switch on the computer. Using a voltmeter, check the voltage on the test point marked
“12V” (see graphic above). You should get a reading of approximately 12 volts. If the reading is 12
volts, go to the next step. If you do not get a 12 volt reading, replace the main logic board.
10. Using a voltmeter, check the voltage on the test point marked “5V” (see graphic above). You should get
a reading of approximately 5 volts. If the reading is 5 volts, go to the next step. If you do not get a 5 volt
reading, replace the main logic board.
14 - iMac (USB 2.0) Troubleshooting
No Power Symptom Charts
11. Remove the bottom housing. Check that all the cables on the logic board are securely connected. Pay
special attention to the video connector. Power on the unit again. If you still have no power, go on to the
next step.
Warning: Whenever the bottom housing is opened for service, you must do two things:
• You must clean the original thermal film from the surfaces joining the thermal interface layer and
reapply thermal paste to the thermal pipe.
• The bottom housing has four torx screws that must be tightened to at least 17 in.-lbs. If you do not
have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT
NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is
firmly mated with the top base. If the bottom housing is not securely attached to the base in this
fashion, the CPU may overheat and become damaged.
12. Check power supply output. Disconnect the power supply cable from the logic board. Measure power at
the power supply connector by touching the black probe to the ground pin, and using the red probe to
measure power at the pins indicated in the graphic below. Did you measure +12v at each point? If yes,
replace the logic board. If no, replace the power supply.
13. Replace the inverter board.
14. Replace the neck assembly.
No Power Symptom Charts
iMac (USB 2.0) Troubleshooting - 15
No Video
Screen is dark, fan is running and the hard drive is spinning. You may hear the startup
chime as well.
1. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh”
appears.
2. The system software could be damaged. Start up from the system CD that came with the computer.
3. Remove the user access panel on the bottom of the computer. With the unit powered on, check if a red
LED is visible in the access door. If the red LED is on, power is on. If you don’t see the LED glowing
red, follow the steps under the symptom “No Power”.
4. Disconnect the A/C power cord. Place the unit in the service stand and remove the user access plate.
Press the PMU reset button on the logic board. Refer to “Resetting the PMU on the Logic Board”
mentioned earlier in this chapter.
5. Check for external video. Connect an external monitor to the mini-VGA port. If you don’t have external
video, replace the main logic board. If you do have external video, go on to the next step.
6. Open the bottom housing and verify that all the cables are securely attached. Pay special attention to
the video cable (located near the modem). If the cables are securely attached, go on to the next step.
Warning: Whenever the bottom housing is opened for service, you must do two things:
• You must clean the original thermal film from the surfaces joining the thermal interface layer and
reapply thermal paste to the thermal pipe.
• The bottom housing has four torx screws that must be tightened to at least 17 in.-lbs. If you do not
have a torque driver, you will have to make sure these screws are tightened by hand FIRMLY, BUT
NOT FORCIBLY. Or, purchase the service tool (076-0899) in order to ensure the thermal pipe is
firmly mated with the top base. If the bottom housing is not securely attached to the base in this
fashion, the CPU may overheat and become damaged.
7. Check the connection of the video cable to the LCD flat panel display (under black tape).
8. Replace the inverter board.
9. Replace the LCD display. Important: If you are replacing the display, be sure to install the new display
shield and EMI gaskets that come with the new LCD panel. Installation instructions are included with
the new display panel. Additional display shields/gasket kits are also available separately as a kit, part
#076-0958.
10. Replace the neck assembly
11. Replace the logic board.
12. Replace the power supply board.
16 - iMac (USB 2.0) Troubleshooting
No Video Symptom Charts
No LED
LED on the 17-inch display bezel does not light up
Note: The LED does not light up when the power is on; however, the LED should pulse when the computer is
in Sleep mode.
1. Put the computer into Sleep mode. Does the LED pulse now? If yes, there is nothing wrong with the LED.
If no, replace the display bezel (922-5297). The LED is attached to the display bezel and cannot be
ordered separately.
LED on the 15-inch display bezel does not light up
1. Put the computer into Sleep mode. Allow the machine to remain in sleep mode for one minute and then
wake the computer to ensure the computer is waking from sleep mode. Does the LED pulse now? If yes,
there is nothing wrong with the LED. If no, replace the LED (922-4702). Note: The LED on the 15-inch
panel can be ordered separately.
No LED Symptom Charts
iMac (USB 2.0) Troubleshooting - 17
Display Tilt
Screen tilts to the left or the right even after a manual adjustment.
Note: It is normal for the screen on an iMac (Flat Panel) to have a small amount of horizontal play.
However, the screen should be able to be adjusted so that it will stay in a level horizontal position.
1. Remove the flat panel.
2. For the 15-inch: Remove the three screws and lift the cable retainer off the panel shield.
3. For the 17-inch: Remove the four screws and lift the cable retainer off the back panel.
18 - iMac (USB 2.0) Troubleshooting
Display Tilt Symptom Charts
4. For either size display, loosen the screws under the metal cable retainer and tilt the screen the opposite
direction of the tilt. Note: The picture below shows the four screws on the 15-inch model; the 17-inch
model looks very similiar.
5. While holding the display bezel in the level position, tighten the screws.
6. Replace the panel and check that the display is now horizontally level. Important: If you are replacing
the 17-inch display, be sure to install the new display shield and any EMI gaskets that may come with the
new LCD panel.
Display Tilt Symptom Charts
iMac (USB 2.0) Troubleshooting - 19
When displaying a single color over the screen area, the LCD panel shows one or more
pixels that are not properly lit
Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text
and images on screen. Each pixel location has three separate subpixels (red, green, and blue) that allow
the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning
the subpixel on or off.
There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the
Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million red, green, and blue subpixels.
Occasionally, a transistor does not work perfectly, which may result in the affected subpixel being turned on
(bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low
number of faulty transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered
acceptable. Rejecting all but perfect LCD panels would significantly increase the retail price for products
using LCD displays. These factors apply to all manufacturers using LCD technology—not just Apple
products.
To determine whether or not the display has an acceptable number of pixel anomalies, follow the steps
below:
1. Set the display image to one of the following colors: all-white display, all-red display, all-green display,
or all-blue display.
2. Using a jeweler’s loupe, pocket microscope, or other magnifying device, identify and count each
subpixel anomaly:
• Bright subpixel anomaly = subpixel that is always on
• Dark subpixel anomaly = subpixel that is always off
3. Important: Check the number of subpixel anomalies with the following chart:
LCD Size
(inches)
17 to 20
Acceptable Number of Subpixel
Anomalies
Replace the Display
Bright
Dark
Combination
Bright
Dark
Combination
up to 4
up to 6
up to 8
5 or more
7 or more
9 or more
4. If the number of subpixel anomalies exceeds the acceptable number listed in the chart, replace the
LCD panel.
5. If the number of subpixel anomalies is acceptable, explain to the customer that the pixel anomalies are
within specifications, and no repair is necessary.
Important: Do not release the specifications to customers. Instead, inform them that a certain
number of subpixel anomalies is considered acceptable, and these factors apply to all manufacturers
using LCD technology—not just Apple products.
20 - iMac (USB 2.0) Troubleshooting
Display Tilt Symptom Charts
Hard Drive
Hard Drive won’t mount to the desktop
1. Disconnect any connected peripherals.
2. Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop.
3. Launch Drive Setup and update the hard drive driver.
4. If no hard drive is found in Drive Setup, verify the hard drive cable connections.
5. Replace the hard drive cable.
6. Replace the hard drive.
7. Replace the logic board.
Flashing question mark appears on the screen
1. Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop.
2. Launch Drive Setup and update the hard drive driver.
3. If no hard drive is found in Drive Setup, verify the hard drive cable connections.
4. Replace the hard drive cable.
5. Reinstall the software drivers for the hard drive.
6. Reinstall system software. Backup the data first.
7. Reinitiation the hard drive.
8. Replace the hard drive.
9. Replace the logic board.
System hangs during normal startup process
1. Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop.
2. Using Drive Setup, reinstall the system software drivers for the hard drive.
3. Using Drive Setup, reinitiation the hard drive.
4. Check all cable connections to and from the hard drive.
5. Replace the hard drive cable.
6. Replace the hard drive.
7. Replace the logic board.
Hard Drive Symptom Charts
iMac (USB 2.0) Troubleshooting - 21
Optical Drive
Optical drive won’t mount to the desktop
1. Try cleaning the disc. If it is dirty or scratched, it may not mount.
2. Try a different disc.
3. Boot from Apple Hardware Test (hold down the “C” key at startup) or boot from the system install CD
(use Startup Manager, hold down the Option key at startup).
4. Perform a clean install with the CD that came with the computer.
5. Replace the optical drive cable.
6. Replace the optical drive.
7. Replace the logic board.
Can’t boot from the optical drive
1. Try cleaning the disc. If it is dirty or scratched, it may not mount.
2. Try a different disc.
3. Boot from Apple Hardware Test (hold down the “C” key at startup) or boot from the system install CD
(use Startup Manager, hold down the Option key at startup).
4. Perform a clean install with the CD that came with the computer.
5. Replace the optical drive cable.
6. Replace the optical drive.
7. Replace the logic board.
Optical disc constantly ejects
1. Disconnect all peripheral devices, especially the mouse in cases where the disc is constantly ejecting.
2. Try cleaning the disc. If it is dirty or scratched, it may not mount.
3. Try a different disc.
4. Boot from Apple Hardware Test (hold down the “C” key at startup) or boot from the system install CD
(use Startup Manager, hold down the Option key at startup).
5. Perform a clean install with the CD that came with the computer.
6. Replace the optical drive cable.
7. Replace the optical drive.
8. Replace the logic board.
22 - iMac (USB 2.0) Troubleshooting
Optical Drive Symptom Charts
Sound Out
No sound from either internal or external speakers
1. Verify volume setting is correct in system preferences.
2. Replace the external speakers or headphone in question with a known-good device.
3. Reset parameter RAM. Press Command-Option-P-R during startup before “Welcome to Macintosh”
appears.
4. Verify internal speaker cable is connected.
5. Replace the internal speaker.
6. Replace the logic board.
Sound Out Symptom Charts
iMac (USB 2.0) Troubleshooting - 23
Sound In
No sound is recorded
1. Check System Preferences > Sound > Input and make sure that Internal microphone is selected, and
that the input volume is at a reasonable level to pick up sound. Use the Input level indicator to judge if
the microphone is picking up sound.
2.
Check the microphone cable connection.
3. Replace the internal microphone. The internal microphone cable assembly is part of the of 20" and 17"
Display bezel, and cannot be ordered separately. For the 15" model, you can order the microphone
cable assembly separately as part 922-4703.
4. Replace the neck assembly.
24 - iMac (USB 2.0) Troubleshooting
Sound In Symptom Charts
Error Beep(s)
Computer beeps at startup.
1. RAM expansion DIMMs for the iMac must be DDR 333 PC2700 compliant SDRAM devices. If the user
installs a DIMM that uses EDO or SGRAM devices, the computer will beep several times when the user
attempts to restart the computer.
2. Refer to “Power-On Self Test” mentioned earlier in this chapter.
Error Beep(s) Symptom Charts
iMac (USB 2.0) Troubleshooting - 25
Modem
No modem dial tone
1. Verify known-good analog (not digital) telephone line.
2. Verify known-good RJ-11 telephone cable.
3. Verify RJ-11 cable is not plugged into Ethernet port.
4. Inspect RJ-11 connector and modem port for pin damage.
5. Verify RJ-11 cable is firmly installed in the modem port.
6. Verify correct modem driver is installed and the correct CCL is selected. If the problem persists,
reinstall system software.
7. Open the bottom housing. Verify the internal RJ-11 modem cable is connected to the modem.
8. Replace the RJ-11 board.
9. Replace the modem.
10. Replace the logic board.
26 - iMac (USB 2.0) Troubleshooting
Modem Symptom Charts
I/O Ports
Difficulty Plugging in an Ethernet Cable
Note: The Ethernet port on an iMac (Flat Panel) has a special mechanism to prevent modem cables from
accidentally being inserted. In some cases, this mechanism can cause difficulty when attempting to plug in
an Ethernet cable.
1.
Verify that you are plugging into the Ethernet port. See graphic below.
2. Notice that the port has two metal tabs (circled below) which prohibit the use of a modem cable.
3. When inserting the Ethernet cable, try holding the cable at a slight angle and wiggle the connector to get
past the metal tabs.
4. Once the connector has passed the metal tabs it should slide in with no further difficulty.
I/O Ports Symptom Charts
iMac (USB 2.0) Troubleshooting - 27
 Service Source
Upgrades
iMac (USB 2.0)
© 2003 Apple Computer, Inc. All rights reserved.
Memory, SO-DIMM
Tools
• #0 Phillips screwdriver.
Part Location
The RAM expansion slot accommodates a standard DDR333 PC2700 complaint SODIMM (small outline, dual inline memory) that uses DDR SDRAM devices.
Important: A RAM expansion SO-DIMM for the iMac (USB 2.0) computer must use DDR
SDRAM devices. If the user installs an SO-DIMM that uses single data rate (SDR),
SGRAM, or non-DDR SDRAM devices, the computer will beep twice when the user
attempts to restart the computer.
Note: This procedure describes installing a SO-DIMM memory module in the useraccessible slot. The iMac (USB 2.0) computer can accommodate standard SO-DIMMs
with a height of 1.0 or 1.25 inches.
Memory, SO-DIMM
iMac (USB 2.0) Upgrades - 1
Procedure
Opening the Computer
Warning: The computer must be turned off before RAM modules are removed or
inserted. To remind you, a red LED is visible in the access door. If the red LED is on,
power is on, and must be turned off before changing RAM modules.
1. Shut down the computer.
2. Unplug all cables from the computer except the power cord.
3. Lay the computer down on a soft cloth.
2 - iMac (USB 2.0) Upgrades
Memory, SO-DIMM
4. Loosen the four captive screws at the base of the computer and gently remove the
access panel.
Memory, SO-DIMM
iMac (USB 2.0) Upgrades - 3
Important: To avoid electrostatic discharge, always ground yourself by touching
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room
until you have completed the installation and closed the computer.
5. Touch a metal surface inside the computer.
6. Unplug the power cord.
4 - iMac (USB 2.0) Upgrades
Memory, SO-DIMM
Installing the Memory Module
Note: If you are replacing a defective memory module, rather than adding a module,
remove the defective module before proceeding.
1. Line up the notch on the memory module with the notch on the memory slot.
Important: Do not push the slot clips (on each side) when inserting memory. They are
used to remove memory from the slot, not to insert memory. These clips are fragile
and could break.
2. Gently insert the memory module into the slot. You will hear a click when the memory
is completely inserted into the slot. Note: Make certain to push the memory module in
the direction of the arrows.
Memory, SO-DIMM
iMac (USB 2.0) Upgrades - 5
Closing the Computer
1. Replace the access panel and the four screws.
2. Reconnect all cables and restart the computer.
Warning: Never turn on the computer unless all of its internal and external
parts are in place and it is closed. Operating the computer when it is open or
missing parts can damage your computer or cause injury.
6 - iMac (USB 2.0) Upgrades
Memory, SO-DIMM
AirPort Extreme Card
Tools
•
#0 Phillips screwdriver to remove the user access panel.
Part Location
AirPort Extreme Card
iMac (USB 2.0) Upgrades - 7
Opening the Computer
Warning: Always shut down your computer before opening it to avoid damaging its
internal components or causing injury. Shut down the computer and wait five
minutes before continuing.
1. Unplug all cables from the computer except the power cord.
2. Lay the computer down on a soft cloth.
8 - iMac (USB 2.0) Upgrades
AirPort Extreme Card
3. Loosen the four captive screws at the base of the computer and gently remove the
access panel.
AirPort Extreme Card
iMac (USB 2.0) Upgrades - 9
Important: To avoid electrostatic discharge, always ground yourself by touching
metal before you touch any parts or install any components inside the computer. To
avoid static electricity building back up in your body, do not walk around the room
until you have completed the installation and closed the computer.
4. Touch a metal surface inside the computer.
5. Unplug the power cord.
10 - iMac (USB 2.0) Upgrades
AirPort Extreme Card
Installing the AirPort Extreme Card
Note: If you are replacing a defective AirPort Extreme Card, rather than adding a card,
remove the defective card before proceeding.
1. Connect the AirPort antenna to the AirPort Extreme Card.
2. Insert the card into the AirPort Extreme slot. Push the card until you hear it click into
the slot.
AirPort Extreme Card
iMac (USB 2.0) Upgrades - 11
Closing the Computer
1. Replace the access panel and tighten the four captive screws.
2. Reconnect all cables and restart the computer.
Warning: Never turn on the computer unless all of its internal and external
parts are in place and it is closed. Operating the computer when it is open or
missing parts can damage your computer or cause injury.
12 - iMac (USB 2.0) Upgrades
AirPort Extreme Card
AirPort Extreme Card
iMac (USB 2.0) Upgrades - 13
 Service Source
Views
iMac (USB 2.0)
© 2003 Apple Computer, Inc. All rights reserved.
Exploded View, Base Unit, (iMac USB 2.0))
Top Housing, Base
922-5797
Fan Gasket
922-4762
Fan Bracket
922-5092
Cap, Spoke
922-5314
Chassis (Faraday)
922-5803 (15" & 17")
922-6204 (20")
Antenna
922-5795
Insulators
922-4691 (Front, 15" & 17")
922-6082 (Rear, 15" & 17")
922-6217 (Rear, 20")
922-6214 (Front, 20")
Fan
922-4677 (15" & 17")
922-6215 (20")
Power Supply
922-5796 (15" & 17")
922-3104 (20")
Speaker
922-4678
Shield, DVD, EMI
922-4692
Hard Drive
661-2962 (80GB)
661-2963 (160 GB, CTO)
661-3106 (80 GB)
661-3107 (160 GB, CTO)
Cable, Hard Drive (not shown)
922-5793
Cable , Optical Drive (not shown)
922-5794
Drive Carrier
922-5802 (15" & 17")
922-6216 (20")
Optical Drive
661-2964 (Combo,15")
661-3042 (Combo, 15")
661-2965 (SuperDrive,17")
661-3108 (SuperDrive, 20")
SDRAM, PC2700, DDR333
Optical Drive Shield Kit
076-1054
661-2987 (256 MB)
661-2988 (512 MB)
661-3145 (256 MB)
661-3146 (512 MB)
Copper Tape
922-4722
AC Line Filter
922-6108
I/O Port Covers
922-5800 (ETH / MDM)
922-5801 (FW / USB)
RJ-11 Board 922-4701
Modem 661-2587
Battery 922-4760
Logic Board
661-2968 (1 GHz,15")
661-2999 (1 GHz, 15")
661-2954 (1.25 GHz, 17")
661-3001 (1.25 GHz, 17")
661-2989 (1.25 GHz, 20")
Clip, TMDS cable, Logic
922-5805 (not shown)
SO-DIMM, DDR, user installable
661-2820 (256 MB, DDR 333)
661-3147 (256 MB, DDR 333)
661-2821 (512 MB,DDR 333)
)
Antenna Extension
922-5807
Door Assembly
922-5799
Door Springs
922-4758 (L)
922-4759 (R)
User Access Door
922-5798
AirPort Extreme Card
661-2755
661-3045
Bottom Housing
922-5804 (15" & 17")
922-6288 (20")
Cover, Protective Mylar, User Access Area
(not shown) 922-6168
Bluetooth Board, Wireless
922-5661 (CTO Only)
Bluetooth, Extension Cable
922-5808 (not shown)
iMac (USB 2.0) - 1
Display Panel, (20”, 1.25 GHz, USB 2.0)
Screws, Rear Housing to Panel (4)
922-6219 (20")
Housing, Rear Display
(Back Cover and Shield)
922-6138 (20")
Inverter
922-6129 (20")
Screws, Inverter (4)
922-6128 (20")
Deflector, Wire, Display
922-6213 (20")
LCD Display (20")
661-2991
Bezel, Display (20")
922-6128
Neck Extension
661-2990 (20")
Note: Identify this extension
by the label, 620-2580, tagged
on the TMDS cable.
2 Views
Screws, Bezel, Display (3, 1.5mm)
922-6289
Display Panel, (17”, 1.25 GHz, USB 2.0)
Housing, Rear Display
(Back Cover and Shield)
922-5299
Deflector, Wire, Display
922-5300
Inverter Assembly
922-5298
17" LCD Display
661-2715
Bezel, Display
922-5297
Neck Extension with cables
(for 17" Display)
661-2825
iMac (USB 2.0) - 3
Display Panel, (15”, 1 GHz, USB 2.0)
Inverter
922-4717 (identify by EEE code of MFY or MFZ)
922-6196 (identify by EEE code of PXT or Q48)
Inverter Shield
(included with inverter)
Shield, LCD Display
922-6110
Metal Neck Cap
922-6197
Cover, LCD Display (w/logo)
922-4681
Microphone (with cable)
922-4703
LED (with cable)
922-4702
Display Bezel Assembly, 15"
(with bezel, microphone, and LED)
661-2582, LG (use with neck extension 661-2969)
661-3019, LG (use with neck extension 661-3021)
661-3020, QDI (use with neck extension 661-3022)
Note: LG displays can only be replaced by LG displays.
QDI displays can only be replaced by QDI displays.
Note: Identify the neck extension by
the label tagged on the TMDS cable
with vendor part number 620-xxxx (see below).
Neck Extension (with cables)
661-2969, LG (TMDS cable is labeled 620-2384; use LG display 661-2582)
661-3021, LG (TMDS cable is labeled 620-2682; use LG display 661-3019)
661-3022, QDI (TMDS cable is labeled 620-2681; use QDI display 661-3020)
4 Views
Screw Matrix Locator 1 of 8
Bottom Housing Bolts (4)
T-15, 922-5104
Grounding Screw to Faraday (1)
T-15, 922-4714
Drive Carrier to Faraday (4)
T-10, 922-4709
Power Supply (4)
T-10, 922-4709
iMac (USB 2.0) - 5
Screw Matrix Locator 2 of 8
Speaker (2)
T-10, 922-4709
Hard Drive to Carrier to Assy (4)
T-10, 922-5105
Optical Drive to Carrier Assy (4)
T-10, 922-5107
Power Supply Shield (2)
T-10, 922-4707
6 Views
Screw Matrix Locator 3 of 8
Metal DVD Shield (2)
T-10, 922-4707
Fan (2)
T-15, 922-4710
Door Hinge (2)
T-10, 922-5108
iMac (USB 2.0) - 7
Screw Matrix Locator 4 of 8
Bluetooth Board (2)
Phillips #1, 076-1067
3mm and 5 mm
Faraday Under Logo (1)
T-8, 922-4706
White Plastic Cap
2 Black
T-10, 922-5110
White Plastic Cap
3 Silver
T-10, 922-5111
8 Views
Screw Matrix Locator 5 of 8
White, Plastic Neck
Cable Retainer (4)
T-10, 922-5112
LCD Bezel for 17" (3)
1.5mm 922-5336
LCD Bezel for 20" (3)
1.5mm 922-6289
LCD Bezel for 15" (10)
(10) for 15"
1.5mm 922-5336
Antenna to Faraday (2)
T-10 922-
iMac (USB 2.0) - 9
( Screw Matrix Locator
, 6 of 8)
Deflector, Wire, Display (4)
T-10, 17", 20"
922-4723
Logic Board,
Metal (3)
Plastic (1)
T-15
RJ-11 Board (2)
T-6 922-5115
10 Views
Screw Matrix Locator 7 of 8
Modem (2)
T-8 922-5116
AC Line Filter (2)
T-10 922-5117
Neck to Back of LCD
Display 15"
T-10 922-5120
iMac (USB 2.0) - 11
(
Screw Matrix Locator
, 8 of 8)
Inverter, (20") (4)
T8, 922-6218
Panel to Rear Housing (4)
T-8, 922-6219
12 Views
Screw Chart
iMac
(USB 2.0)
20", 17", 15"
Screw Matrix
Hard Drive to Carrier to Assy
(4)
T-10
922-5105
Door Hinge
(2)
T-10
922-5108
Cap, Spoke Cap
2 Black
T-10
922-5110
Logic Board, Metal (3)
T-15
922-4715
AC Line Filter
(2)
T-10 922-5117
Bluetooth Board
(2) 076-1067 kit Phillips #1
Bottom Housing Bolts
(4)
T-15
922-5104
Optical Drive to Carrier Assy
(4)
T-10
922-5107
Fan Bracket to Fan (2)
T-25
922-4708
Cap Spoke Cap
2 Silver
T-10
922-5111
Logic Board, Plastic (1)
Phillips 0 922-5113
Inverter (20")
922-6218 T-8
Support to Extension (4)
922-5332 (17" & 20")
Grounding Screw to Faraday
(1)
T-15
922-4714
Power Supply Shield (2)
Metal DVD Shield (2)
T-10
922-4707
Faraday to Outer Shell
(1)
T-10
922-5106
White, Plastic Neck
Cable Retainer (4)
T-10
922-5112
RJ-11 Board (2)
T-6 922-5115
Speaker (2)
Power Supply (4)
Drive Carrier to Faraday (4)
T-10
922-4709
Fan
(2)
T-15
922-4710
Faraday Under Logo
(1)
T-8
922-4706
Neck to back of LCD display
(4), under metal biscuit (15")
T-10
922-5120
Modem (2)
T-8 922-5116
Panel to Frame (4)-17" only
T-10 922-5331
Display to Rear Housing
1.5 mm hex (15" & 17")
922-5336
Panel to Front Bezel (20")
922-6289 1.5mm (3)
Panel to Rear Housing (20")
(4) 922-6219 T-8
Antenna (2)
T-10
iMac (USB 2.0) - 13