LG 50PC1DR Plasma TV Troubleshooting Manual

50PC1DR

Troubleshooting

Plasma Display Panel Troubleshooting - 2007

1

Overview of Topics to be

Discussed

•Switch Mode Power Supply

•Y SUS Board

•Z SUS Board

•X Drive Boards

Troubleshooting


2

Safety Rules

PLASMA Overview

Safety & Handling Regulations

Troubleshooting

1. Approximately 10 minute pre-run time is required before adjustment.

2. Do not exceed Higher voltage than is required for the product.

3. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, and it is recommended that you should not touch the drive circuits for at least one minute because of residual current stored.

4. Circuit drive has c-mos circuits which should be protected from static electricity.

5. The PDP Module must be carried by two people.

6. Be careful of short circuit when measuring voltage.

7. Be cautious of screws and other metal objects to prevent short in circuitry.

Checking Point before Requesting MODULE Repair

1. Check the appearance of Panel and boards.

2. Check the model label. Verify model names and board model matches.

3. Check details of defective condition and history.

Ex) COF long 2-1 fail, address 1 line open, Y b/d trouble, Mal-discharge on screen.


3

Switch Mode Power Supply Troubleshooting

This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single

Scan Plasma. Upon completion of the section the technician will have a better understanding of the operation of the Power Supply circuit and will be able to locate voltage and test points needed for troubleshooting and alignments.

•

DC Voltages developed on the SMPS

•

Adjustments VA, VS, and 5V DC

• Always refer to the sticker located in the upper right side of the PDP for the correct voltage levels for the DC 5v, VA, VS, V SET UP, -VY, VSC, and Z Bias as they will vary from Panel to Panel.

V SET_UP

-

VY VSC

Z_BIAS


4

Troubleshooting Steps

• Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc.

• Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply voltages to those circuits under test. Always confirm the Supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.

• Isolate To further isolate the failure check for the proper waveforms with the

Oscilloscope to make a final determination of the failure. Look for correct Amplitude and Timing of the signals also check for the proper Duty Cycle of the signals.

Sometimes “glitches” or “road bumps” will be an indication of an eminent failure.

• Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.


5

SMPS Operating Modes

Troubleshooting

• Deep Sleep Mode - Guide Plus not programmed or Cable Card not installed and set is plugged in and turned off. The SMPS outputs S 5v (Standby). Guide Plus has been programmed the set will remain in Standby Mode when turned off for approximately 2 hours and go into Deep Sleep Mode. The unit can be taken out of DS Mode as needed for TVGOS Data.

• Standby Operation - Guide Plus has been programmed or a Cable Card is installed and unit is powered off the SMPS will output 19v,12v, 6v, 5vS, and 3.3v Supplies.

• Full Power On - SMPS outputting all of the Standby Voltages and the

VA, VS, and 5v DC, set in full operation

.

Power Sequence

• AC Cord Plugged in – Standby 5v

• AC Detect sent from the Power Board Pin1 of P800 to the Digital Board. Needed to enable the

Micro Processor to output the RL-ON Signal to turn on the SMPS.

• Digital Board sends RL-ON to P800 Pin 2 to cause Controller IC U701 on the Power Board to turn on the Relay Drive Transistors Q701 and Q702 closing the Relays RL101 and RL102 turning on the 3.3V, 5V, 6V, 12V, and 19V supplies.

• VS-ON applied from the Digital Board to the Power Board on connector P800 Pin 5 used to turn on the VA, and VS Supplies

• 5V-M Sent from the Digital Board to the Power Board to turn on 5V-DC.

• 5V-D is sent from the Digital Board through P800 Pin 6 and used to bring the Power Supply out of

Deep Sleep Mode.


6

Troubleshooting

Switch Mode Power Supply (SMPS) Voltages

• VS 196v used to drive the Horizontal Grid Voltage, Y SUS, and Z SUS. Measured from pins 8, 9, and 10 of connector P805 to chassis ground. Adjusted at VR951

• VA 60v used to drive the Vertical Grid Voltage, X Boards and in the IPM Circuits to develop Y and Z

Drive waveforms. Measured from pins 1 and 2 of connector P805 to chassis ground. Adjusted at

VR901

• 5v.DC Used to develop bias voltages for the circuits on the Y SUS, Z SUS, X, and Control Boards.

Measured from pins 1 and 2 of connector P804 to chassis ground.

• 3.3v. Standby voltage applied to the Analog, and Digital Boards to Bias the Signal and Control circuits. Measured at connector P803 at pins 1 and 2. to chassis ground. Adjusted at VR221.

• 19v Applied to the Analog Board and used for the Audio Output Supply, present in standby.

Measured at P802 pins 1 and 2 to chassis ground.

• 12v Used for supplying low voltage regulators on the Digital and Analog Boards, present in standby.

Measured at P803 pins 9 and 10 to chassis ground.

• 6v Applied to the Digital Board used for the signal processing circuits present in standby. Measured at P803 pins 5 and 6 to chassis ground.

• S 5v Standby 5 volts at P800 pin 3 applied to the Digital Board.

• VS- ON Switched 5 volts at P800 pin 5 present after power up to switch on the VA, VS, and 5V on the Power Board from the Digital Board.

• 5v-D Switched 5v used to bring the Power Supply out of Deep Sleep Mode.

• 5V-M Needed to turn on the 5V-DC Supply.


7

VS

Power Supply

VS Adjust

VA

Adjust

VA Source

VA

5v

VS Source

Control IC

19v Audio Supply

12V,6V, 5V and

3.3V Source

3.3v

Adjust

P802

P803 P800


Standby Circuit

8

Troubleshooting

380 Volt Supply

AC Input Circuit

Troubleshooting

Power Supply

Low Voltage Connectors

P800

PIN1

P803

PIN 1

P802

PIN 1

P800

1) AC-D

2) RL-ON

3) S-5V

4) GND

5) VS-ON

6) 5V-D

7) M5V-ON

8) S-5V

9) GND

10) NC

11) 6V

12) N.C

13) 3.3ON

P803

1) 3.3V

2) 3.3V

3) GND

4) GND

5) 6V

6) 6V

7) GND

8) GND

9) 12V

10) 12V

11) GND

12) GND

P802

1) 19V

2) 19V

3) GND

4) GND

5) 6V

6) GND

7) 3.3V

8) GND

9) 12V

10) GND


9

Power Supply Voltage Distribution

HS2

Q607

HS3

U801

Q801 PC901

T801

P802

19V

3.3V

12V

R606

R607

L601

Q606

Q601

U851

Q602

D602

D601

T902

L851

C855

U151

380V

C602 C603

10

Q854

R963

T901

Q855

R870

R162

Q151

Standby

Regulator

U501

T112

P803

3.3V

6V

12V

AC DETECT

RL- ON

VS-ON

5V-D

5V-M

S-5V

6V

P800

S-5V

U601

PCs

Control

IC

28

S-5V

D502

U701

24

20

19

R745

R747

Low Voltage

Standby Power

Supply

T501

HS1

D101

D102

Q701

Q702

D703

D704

AC

Relay

RL101

AC

Relay

RL102

D506

120VAC

D501

TH01 TH02


HS4

Troubleshooting

D951

D952

D953

D271

6V

D261

Q252

D251

D202

VS

VA

5V-M

Q281

3.3v

HS6

5V

U261

Q223

D221

AC

INPUT

Circuit

F101

AC Input

Y SUSTAIN BOARD Troubleshooting

Troubleshooting

This Section of the Presentation will cover troubleshooting the Y SUS Board for the Single

Scan Plasma. Upon completion of the Section the technician will have a better understanding of the operation of the circuit and will be able to locate voltage and resistance test points needed for troubleshooting and alignments.

• Adjustments

• DC Voltage and Waveform Checks

• Resistance Measurements

Operating Voltages


SMPS Supplied VA 60v.

VS 196v.

5v.

Y SUS Developed VSC 115v.

-VY -196v.

IPM 18v.

ER IPM

SUS IPM

Ramp UP

V SET DN

V SET UP

11

Important Note

Troubleshooting

• The following voltages and waveforms should be adjusted in the order they are presented.

• Always adjust the DC levels before the waveform adjustments to most accurately set the Plasma

Display Panel.

Voltmeter Adjustments to Y SUS

• VSC 115v Used to shape the Y Drive waveform by setting the V Scan level. Measured at the

VSC test points.

• -VY -196v Used to shape the Y Drive waveform by setting the negative excursion of the V Set

Check Y Sustain Board Output Voltage with the Voltmeter make sure the -VY and VSC are the same as the Voltage Label on the upper right side of the PDP.

Check VSC

Check -VY


12

Troubleshooting

Waveform Adjustments Y SUSTAIN

• Ramp Up Used to shape the Y Drive Waveform by changing the pitch of the Top Ramp

• V SET DN Used to shape the Y Drive

Waveform by changing the pitch of the Bottom

Ramp

• V SET UP Used to shape the Y Drive waveform by leveling the Top Ramp


13

Troubleshooting Single Scan Panel

*Waveforms may vary with different

Y_SUSTAIN PCB part #’s.

RAMP UP

Normal Waveform

Scope TP

35 micro seconds

Panel Waveform Adjustment

-VY

000

180 micro seconds

VSET UP

This test point is the reference for all the following signals referred to here.

Readings are taken with the probe set to 10x1.


14

Ground VSET DN +VSC



Ramp up too high

Noticeable low level color distortion with the Ramp_up too high.

Ramp up too low


Noticeable low level color distortion with the Ramp_up too low.

15



Vset DN too low

The center begins to wash out and arc due to decreased

Vset DN time.

Vset DN too high


16

All of the center washes out due to increased Vset_DN time.



Vset UP too high

The center begins to wash out and arc due to Vset UP

Peeking too late and alters the start of the Vset DN phase.

Vset UP too low


17

Very little alteration to the picture, the wave form indicates a distorted Vset UP. The peek widens due to the Vset UP peeking too quickly.



-VY too low (-154vdc)

Colors and the image will bloom slightly and the unit will have difficulty with clean frame changes in a quickly altering image.

-VY too high (-227vdc)


18

The center begins to wash out and arc due to –

VY running to long and clipping.



VSC too low (77 Volts)

The image will show very little change but there will

Be some distortion in a quickly changing image.

VSC too high (140 Volts)


19

The image will show very little change but there will

Be some distortion in a quickly changing image.

SINGLE SCAN PDP 50PX3

ZBIAS adjustment: On the Z-Sustain PCB

With the DVM across R92 adjust the potentiometer till the DVM reads 93 vdc.

DVM


20

Troubleshooting

Y sustain board

Control Board supplies Logic Signals to the Y Sustain Board for processing, which then develops the signal to drive both of the Y Drive Boards sequentially with the Y Output Waveform for PDP operation.

Logic signals from

Control Board

< Probe connect point to Oscilloscope to check Y Drive output wave form to the Y Driver Boards >

Y Output Waveform

Y


V s

21

Diagram of Y Sustain Board

Z SUS Board

Distributes 5v VA VS

Distributes 5v VA

Y Sustain Board

Power Supply Board - SMPS

Receive 5V,Va, Vs from SMPS

Distributes 5v

IPM generates

Sustain Waveform

Generates Vsc, -Vy from

5v VA Vs by transformer.

Bottom Left X Board

FETs amplify Sustain

Waveform

Transfer Waveform to Y Drive Board

Display Panel

Troubleshooting

Control Board

Logic signals needed to generate drive waveform


22

Troubleshooting

IPM (Intelligent Power Module)

ER_UP ER_DN

There are two IPMs used in 50PC1DR on the Y Sustain Board.

1. SUS IPM (IC202)

2. ER IPM (IC201)

Role of IPMs

1. Generate Sustain Waveform (square wave) – SUS IPM.

2. Energy Recovery Function (for saving power) – ER IPM.


23

How to check IPM

(Resistance ‘Diode Check’, board removed from set)

Forward Test : 1. GND (＋), Sus-out ( - )

2. Sus-out (＋), Vs ( - )

3. ER-DN ( - ), GRND (＋)

4. GRND ( + ), ER-UP ( - )

5. 18v ( - ), ER GRND ( + )

6. 5v ( - ), ER GRND ( + )

Reverse Test : 1. GND ( - ), Sus-out (＋)

2. Sus-out ( - ), Vs (＋)

3. ER-DN (＋), GRND ( - ) 1.4

4. GRND ( - ), ER-UP ( + ) 1.4

5. 18v ( + ), GRND ( - ) 1.9

6. 5v ( + ), GRND ( - ) .9

Note: ER_HIGH ER_LOW, to ER_lO OPEN in Diode Check


24

Troubleshooting

▶ Major defect : IPM fail, FET fail, fuse

Defect name

IPM Fail

Description of defect

No display

( If the ER IPM failed,

The screen can display normal picture for few minutes)

(If SUS IPM failed, top portion of Drive

Waveform will be missing )

FET Fail

No display

( loss of Drive Waveform

- Power FETs on Y

Sustain Board )

Part

Fuse

No display

* 5V- SMT fuse

* Va, Vs fuse-ceramic fuse

Vs


25

Va

5V

Troubleshooting

Defect display

`

< No display >

Y SUS

Troubleshooting


26

Y SUSTAIN

P3

5v floating ground

Supplies Logic signals to Y

Drive Boards to sequentially scan the Horizontal Grid floating ground

64v

Y SUS output

64v floating ground

18v IPM

Measured at

R61

Oscilloscope

Waveform adjust test point


27

P2

P11 to Z SUS Board

5v VA VS

Troubleshooting

ER_IPM (IC201)

P1

VA

Ground

VS

5v

P5

Ground

VA, VS, and 5v all supplied from

SMPS

SUS_IPM (IC202)

P6

Ground

5v to the Control Board

P4

Logic signals input from the Control Board to Y SUS

PS101 -VY

Transformer coupled

PS102 VSC

Transformer coupled

5v and VA to X Drive

Board

Y Drive

Output Waveform

Single Scan


28

Troubleshooting

Troubleshooting

Resistance Measurements performed with board installed and no power applied -

(all resistance measurements are approximations)

• VA 3 Meg measured from chassis ground

• VS 18 Meg measured from chassis ground

• 5v 2K measured from chassis ground

• VSC Measure in Diode Mode at VSC TP

• -VY Measure in Diode Mode at -VY TP

• Floating Ground to Y Drive input measure in Diode Mode

Y SUSTAIN Board removed from PDP Assembly

(all resistance measurements are approximations)

• VS to SUS OUT 1 Meg

• SUS OUT to Chassis Ground 1 Meg

• SUS_UP(+) SUS_DN(-) 450K

• ER_LO to ER10 1 Meg

• ER_HIGH to ER10 1 Meg

• 18v to Chassis Ground 6K

• 5v to Chassis Ground 2 Meg

• ER_UP to Chassis Ground 10K

• ER_DN to Chassis Ground 10K

• SUS_UP to Chassis Ground 700K

• SUS_DN to Chassis Ground 700K

• Y SUS out at B1 to Floating Ground 2 Meg (infinite in Diode Mode)

• VSC Test Points Measure in Diode Mode

• -VY Test Points Measure in Diode Mode

• ER_UP to ER_DN 20K


29

Y DRIVE BOARD

Troubleshooting


30

Y DRIVE Boards

Y-Drive Board works as a path supplying Sustain waveform and Reset waveform which is made in Y SUSTAIN B/D to the Panel through SCAN

DRIVER IC

Supplies a waveform which selects horizontal electrode sequentially.

* 50PC1DR uses 12 DRIVER ICs (TOP, BOTTOM: 6 each)

Troubleshooting


VH

HVO

GND

31

Module check point

Troubleshooting

Defect Condition Visual check of YDT-BTM

Horizontal bar displays across the screen due to no

Scan Pulse caused by Scan IC Failure.

Failures can be found, sometimes by a visual inspection of the Y DRIVE Board scan IC’s .

Defect : Horizontal Bar or Shutdown


32

Z SUSTAIN Board Troubleshooting

This Section of the Presentation will cover troubleshooting the Z-SUS Board Assembly. Upon completion of this section the Technician will have a better understanding of the circuit and be able to locate voltage and resistance test points needed for troubleshooting and alignment.

• DC Voltage and Waveform Test Points

• Z BIAS Alignment

• Resistance Test Points

Operating Voltages

Y SUS Supplied

Developed on Z SUS

VA 60v.

VS 196v.

5v.

Z Bias 90v

SUS_IPM

ER_IPM

IPM 18v


33

Troubleshooting

Input Voltages from the Y SUS Board

VS Supplied to IC7 the SUS_IPM through coil FL152 and to the Primary Winding of Transformer

T2 of the Z Bias Circuit. Input measured from P151 pin 12 to chassis ground.

VA Supplied to the ER_IPM through parallel resistors R91 and R9 and through Diode D84. The VA voltage is also routed to connectors P152 and P153 at pin 7 of each connector. Used to supply

60v to the Center and Bottom Right X Boards. Input measured from pins 8 and 9 of P151 to chassis ground.

5v Used to Bias the circuits on the Z SUS Board and through P152 and P153 pins 3 and 4 supplies 5v to bias the Center and Right X Boards. Input measured from P151 pins 1 and 2 to chassis

Voltages Developed on the Z SUS Board

Z Bias 90v used to Bias the output circuits that drive the Sustain and Erase pulses for the PDP.

Measured across parallel resistors R25 and R111, adjusted at VR3.

IPM 18v Needed to generate the Sustain and Erase pulses in the IPMs. Measured at right side of resistor R100 (above capacitor C27).


34

Z SUSTAIN Board

IC7 SUS_ IPM IC5 ER_IPM

Troubleshooting

R111

,

R25 Z BIAS TP

VS

VA

P151

5v

18v IPM at right side of R100

P1 from control board

Timing, Data, and control signals


35

Z BIAS

Adjust

Control

P151 and P152

Supplies VA and 5v to X

Boards

Z SUSTAIN Voltage Distribution

From Y SUS Board

FL152

Troubleshooting

To X Drive Boards


36

Waveforms Z SUSTAIN Board

Troubleshooting

• Input signals to the Z SUS Board at P1 from the Control

Board are routed through IC1 and IC82 to the IPM.

These signals are used to develop the Z SUS Drive

Waveform to drive the PDP.


37

Troubleshooting

Z Board SUS Board

Waveform inputs from the Control Board

NOTE: These voltages will vary due to changes in design and variations in the PDP panel.

PIN1

Pin 1

PIN2 PIN3 PIN4

PIN5 PIN6 PIN7 PIN8

PIN9 PIN10 PIN11 PIN12


38

Troubleshooting

Z SUSTAIN Board

Provides the SUSTAIN PULSE and ERASE PULSE for generating

SUSTAIN discharge in the panel by receiving LOGIC signals from the CONTROL B/D.

This waveform is supplied to the panel through FPC(Z).

< Probe connect point to Oscilloscope to check Z wave form >

95

V

95V

Vs

Z DRIVE Waveform

Z


39

Troubleshooting

Z SUSTAIN BOARD

Distributes

5v, VA, VS

Y SUS Board

Distributes Logic Signals

Control Board

IPM generates erase, sustain waveform

Receive 5v, VA, VS

Distribute 5v, VA

X Board Center and Right

Generates Z Bias

FET Makes Drive waveform

Display Panel

Via FPC (flexible printed circuit )


40

Z SUS IPM (Intelligent Power Module)

95

V

Z

95V

Vs

SUS_UP

SUS_DN ER_UP

ER_DN

SUS_DN

There are Two IPM ( Intelligent Power Module) on the Z sustain board of the 50PC1DR.

One is SUS IPM (IC7) , another is ER IPM (IC5)

Role of IPM

1.Generate sustain and erase waveform( square wave ) – SUS IPM.

2.Energy recovery function ( for saving power) – ER IPM.

Troubleshooting


41

▶

Major defect

:

IPM fail

, cable connection

.

Defect name Description of defect Part

IPM Fail Dark display

P1 Cable connection

If the cable was not connected,

There is no display


42

Troubleshooting

Defect display

< Dark display >

< No display >

FPC (Flexible Printed Circuit) Removal for Z Board Replacement Troubleshooting

Pull out Lock as shown in circles

Pull Lock apart to remove

Resistance Measurements

• VS Started at 340 meg settled approx 1 meg

• VA 1.3 meg

• 5v 1 meg

• B10 to Chassis Ground 2 meg

• Chassis Ground to SUS_OUT 2 meg

• SUS_OUT to VS 1 meg

• ER low to ER 10 1 meg

• ER 10 to ER High 1 meg

• 18v to Chassis Ground 6K

• SUS_UP to Chassis Ground 700K

• SUS_DN to Chassis Ground 2meg

• ER_UP to Chassis Ground 10K

• ER_DN to Chassis Ground 10K

Pull FPC Connector as shown in arrow.

*Measurements made with the board disconnected


43

CONTROL Board

Troubleshooting

Troubleshooting


44

CONTROL Board

◆

. In charge of all signal process and creating ON/OFF order of all FET on

Troubleshooting

DRIVER B/D by receiving 8 bit R, G, B input.

◆

. Power : 3.3V/5V

Temperature diode

Voltage

Regulator

Flash ROM

Voltage

Regulator

Temperature display diode can be checked.

Left picture shows 7 periods which means normal temperature

Green = OFF

Yellow = ON

Weight

D15 - 8

D16 - 4

D17 - 2

D18 - 1

TEST Pattern

AUTOGEN

P1 Connector

MCM

(Micro

Control

Module)


LG Part Number Label

45

Control Board

1. Check LED ( Normal status lighting or not )

2. CHECK OSC X1 output. (100MHZ)

3. Check CTRL input voltage

(CONNECTOR P10)

4. CHECK each FET 3.3V, 5V,1.8V., 2.4V

OSC(X1)

Check oscillator state.

Be careful to avoid physical shock.

Check

FET’s

GND

+5v

Probe

3.3vdc

Test point

1.8vdc

Troubleshooting

100.0 MHZ

2.4vdc

5vdc


46

Input voltage

Control Board

▶

Main Defect : MCM , connector, oscilator, LVDS poor connection

▶

Voltage used : 5V/3.3V/1.8V/2.5V (4 separate operating voltages).

Defect part Description of defect Part

Solution

CONTROL IC

Regular vertical lines

Replace

Control

Board

< MCM >

Connector

No display or

Partly no display

Reseat

Control

Board

Connectors

< Connector >

Oscilator

LVDS poor connection

No picture

< Oscillator >

Remove LVDS Cable and short pins 1 and

2 of connector P1 to display test patterns.

If patterns are not present, Control board is defective LVDS Connector

Replace

Control

Board

Reconnect

LVDS or

Replace

Control Board


47

Troubleshooting

Defect display

< Display Lines >

< Partly no display >

< Poor connection >

X Drive Board

Voltages Supplied to the X Boards

•

• VA From the Z SUS Board to both the Center and Right X Boards.

• VA From the Y SUS Board to the Left X Board

• 5v From the Z SUS Board to both the Center and

• Right X Boards.

• 5v From the Y SUS Board to the Left X Board.

Troubleshooting


48

Troubleshooting

The Control Board supplies the Video Signal to the TCP

ICs. If there is a bar defect on the screen, it could be a

Control Board problem.

Diagram of Control Board

Control Board to X Board

Address Signal Flow

This will show Signal Flow Distribution to help determine the failed part depending on where the failure is on the screen.

MCM

Buffer

IC

Array

16 line

16 line

16 output

TCP

TCP

TCP


49

TCP (Tape Carrier Package)

: supplies RGB 6bit signal to the PDP by connecting the PAD

Electrode of the PANEL with the X Board.

Troubleshooting

Connector

TCP IC

TCP


50

Front side

<IC Defect>

Behind side

P200

Center X Drive Board

Troubleshooting

P210

P208

Output to TCP ICs


51

Troubleshooting

Center X Board

Connections on Connector P208

FL209

1 Thru 6

Grnd

VA (7,8,9)

10 Thru 14

Grnd

RGB Logic Signals

15 Thru 23

FL208

RGB Logic Signals

24

CLOCK

25 THRU 30 Grnd

31 Thru 34

35 Grnd

36

37 Thru 41 Grnd

VA (42,43,44)

45 Thru 50

Grnd

1

50

Output to TCP IC


52

RGB Signals from the Control Board

X Board Voltage Distribution

IC201

P200

IC202

C221

C222

C223

L201 L202

D201

D202

VA 5V GND

P210

FL201

IC203

C241

FL214

FL215

FL212

FL213

FL210

FL211

FL208

FL209

FL206

FL207

FL204

FL205

FL202

FL203

RGB Address Signals out to TCP IC’s and PDP


53

Troubleshooting

The X Board receives a Logic Signal from the Control Board and controls the Address Pulse (generates Address Discharge) by an ON/OFF operation, and supplies the waveform to TCP (data).

COF Separating

Lift up lock as shown in the Picture.


54

Remove TCP as shown in Picture

X board

▶ Major defect : Poor connection, Particle inserted.

Defect name Description of defect Part

Vertical abnormal display

< Poor connection >

Poor connection

Vertical abnormal display

Attached particle

Vertical line

( similar with IC fail )

Check for attached particle or poor connection either one is possible.


55

Troubleshooting

Defect display

Vertical Line

Troubleshooting

Disconnect TCP, Check for a possible particle, if found remove with compressed air or soft fabric.

If 1 vertical line can not be resolved by this, then the defect can not be repaired and the PDP will need to be replaced.

Attached particle

Make sure the Ribbon Cable is securely installed


56

Control Board : If the buffer IC has failed, there can be vertical lines.

Troubleshooting

The defect can not be repaired if the vertical line is caused by TCP IC failure.

Root cause of TCP IC failure is ESD or Surge.

< Structure of TCP with X ray analyzer >

< Failure viewed with microscope >


57

< metal particle between the electrode >

Troubleshooting

Cable description

This is total collection of cables in PDP circuit ,

⑥

⑦

⑫

⑭

⑬

⑤

①

②

③ ④

⑧

⑪

⑨

⑩

Cable No.

8 9 10

2 3 4

1

5

13

14 12

11

6

7

Purpose

Supply Va,5V to X B/D

RGB Video signal

FET driving signal to make the Y waveform

5V,15V for IC and FET driving

5V supply

Va,Vs for Y and Z board

FET driving signal to make Z waveform

Supply waveform on panel for operation

Connecting between

Y drive top and bottom


58

Troubleshooting

When each cable disconnected.

Cable No.

8 9 10

2 3 4

1

5

13

12 14

11

6

7

When disconnected

The section of the X board where the cable is disconnected will not show the screen.

The section of the X board where the cable is disconnected will not show the screen.

No display (no Y waveform )

No display ( CTRL board will not be operated )

No display ( no 5 V )

No display ( no Va,Vs )

No display ( no Z waveform )

No display ( if the connection is poor, the display will be abnormal)

Bottom half of screen will not be displayed.

< ⑧ or② was

disconnected >

< ⑥ was not connected

Plasma Display Panel Troubleshooting - 2007 well >

59

- well connected-

- Not connected -

< ⑦ was not connected >

Dual Scan Y SUS Board

Voltage Distribution

VSC Floating

Ground

B41

Oscilloscope

Waveform

Y Drive

HS5

Q16

Q26

Q8

Q7

Q5

Q6

Q12

Q17

Q18

Q19

Q11

Q15

Q14

Q10

Q13

Q25

IC8

Q9

P5

VA 5v GND P11 VS VA

GND

R27

5v

R17

VSC TP

VSC

PS5

-VY

PS3

IC17

Q4

IC303

Q3

Logic

Signals

From

Control

Bd.

15v IPM

L3

VSC Floating Ground

R132

L6

L8

R95

D21

D12

-VY TP

VS

SUS_OUT

IC7

15v

SUS_UP

SUS_DN

ER_HIGH

ER_I0

VS_2

ER_ LOW

ER_UP

ER_DN

FL1

L4

-VY

IC303

IC302

VSET DN

Circuits

HS4

D9

VSET GND

R88

R100

L2

D11

V SET UP

L7

VS

SUS_ OUT

IC2

15v

SUS_UP

SUS_DN

GND

ER_ HIGH

ER_l0

VS_2

ER_ LOW

5v

ER_UP

ER_DN

VSET UP

TP

PS1

HS7

P7

GND 5V VA


60

FS2

FS1

P3

VS

FS3

VA

P4

5v

P6

IC3

IC1

P1

Logic signals from the

Control BD for IPMs and

Y Drive

IC10

IC19

How to check IPM (Dual Scan)

(Resistance ‘Diode Check’, board removed from set)

For both IC2 and IC7

Troubleshooting

Forward Test : 1. +VS ( - ), SUS_OUT ( + )

2. SUS_OUT ( - ), CH GND ( + )

3. CH GND ( + ), ER_HIGH( - )

4. +15 ( - ), CH GND ( + )

5. +5 ( - ), CH GND ( + )

6. SUS_UP ( - ), CH GND ( + )

7. SUS_DN ( - ), CH GND ( + )

8. ER_UP ( - ), CH GND ( + )

9. ER_DN ( - ), CH GND ( + )

Reverse Test: 1. +VS ( + ), SUS_OUT ( - )

2. SUS_OUT ( + ), CH GND ( - )

3. CH GND ( + ), ER_HIGH ( + )

4. +15 ( + ), CH GND ( - ) 3.03

5. +5 ( + ), CH GND ( - ) .96

6. SUS_UP ( + ), CH GND ( - ) 1.42

7. SUS_ DN ( + ), CH GND ( - ) 1.42

Note: ER_HIGH to ER_IO ( OPEN )

SUS_OUT to ER_IO ( SHORT )


61


Troubleshooting

Y SUSTAIN Board VSC / -Vy Measurement

Y-BOARD VSC C51 Both ends

-Vy R36 Both ends


62

Y-BOARD VSC R53 Both ends

-Vy R78 Both ends


Troubleshooting

Z SUSTAIN Board VzBias Measurement

Z-BOARD Vzbias

GND-Q18


63

Z-BOARD Vzbias

R23 Both ends

Waveform

Test point

DUAL SCAN PDP 50PX2

Vsc test point, Adjustment

-Vy test point, Adjustment

Variations in the PCB design will result in variations in

The signal driving the PDP panel. Refer to the label on the

Y-SUS PCB match this number to the correct signal in this manual.


64

Normal Y-SUS PCB #038C



65

V-Set DN too low


V-Set DN too high

All of the center washes out due to decreased Vset_DN time.



Vset_DN time.

66

V-Set UP too Low


V-Set UP too High

The center begins to wash out and ark due to Vset_UP

Peeking too late and alters the start of the Vset_DN phase.


Very little alteration to the picture, the wave form indicates a distorted Vset_UP. The peek widens due to the Vset_UP peeking too quickly.

67

Ramp-UP too low


Ramp-UP too high




68

Normal Y-SUS PCB #038B



69

Vset-DN too low


Vset-DN too high

All of the center washes out due to decreased Vset_DN time.



Vset_DN time.

70

Vset-UP too low


Vset-UP too High

The center begins to wash out and ark due to Vset_UP

Peeking too late and alters the start of the Vset_DN phase.


Very little alteration to the picture, the wave form indicates a distorted Vset_UP. The peek widens due to the Vset_UP peeking too quickly.

71

Ramp-UP too low


Ramp-UP too high




72

DVR Operation and

Troubleshooting


73

Theory of Operation


74

Hard Drives the Beginning

Hard disks were invented in the

1950s. They started as large disks up to 20 inches in diameter holding just a few megabytes.

They were originally called "fixed disks" or "Winchesters" (a code name used for a popular IBM product). They later became known as "hard disks" to distinguish them from floppy disks.

Hard disks have a hard platter that holds the magnetic medium, as opposed to the flexible plastic film found in tapes and floppies.

HDD, circa 1979 - an early 8" disk


75

Hard Drives Today

Hard drives have now become very small and can store massive amounts of data. As of

2005, over 98% of the world's hard disks are manufactured by just a handful of large firms:

Seagate, Maxtor (acquired by

Seagate in May 2006), Western

Digital, Samsung, and Hitachi which owns the former disk manufacturing division of IBM.

2.5 inch laptop hard disk


76

LG uses Seagate Hard Drives

The 160 Gigabyte Barracuda Hard

Drive from Seagate is built into several models of LG televisions and provides about 15 hours of

HDTV recording or 66 hours of

SDTV recording without the need of any external accessories.

It is a 3.5 inch serial ATA (Advanced

Technology Attachment) Hard

Drive.


77

Recent Hard Drive Upgrade

In addition the grommets for

HDD mounting have been changed to P/N 5040V00101B

*Rubber changed from hard material to soft material

LG recently started replacing the HDD that was designed for PC use (P/N:6744B00040A) with a low-noise HDD designed for A/V use (P/N:6744B91953A). The original HDD is shown on the right and the upgraded version is shown on the left.


78

Hard Drive Control

The HDD is controlled by IC1002 on the digital board


79

Hard Drive Control

The SiI3512 is a single-chip PCI to 2-port

Serial ATA host controller. Based on a

32-bit 66 MHz PCI interface, the SiI3512 provides support for two independent

Serial ATA devices. The second Serial ATA output is used to control the memory card reader if the unit has that option.


80

CPU

IC100 is the AMCC PowerPC. It controls the Serial Host controller IC1002.


81

CPU

The 405 CPU core is 100%

PowerPC compatible and possesses all of the qualities necessary to make powerful and cost effective system-on-a-chip designs a reality.

Optimized interfaces to the Core Connect bus structure provide for a high bandwidth, low latency system interface solution.


82

Let’s put it all together

HDD/DVR

CPU IC100

PCI

Bus


Serial Host controller IC1002

83

Serial ATA Bus

50/60PY2DR-UA VIDEO PATH - DVR

SDRAM

(IC302, IC303)

CPU

PPC405GPr

(IC100)

PCI BUS

SATA controller siI3512

(IC1500)

CON

(CN1500)

CON

(CN1501)

HDD

EPF Module

VSB_T

OOB(DCR)

Tuner

(TU500)

MUX CPLD

TPN_T

P

ATSC/NTSC

Tuner

(TU301)

VSB/

QAM

/0x1C

RF

SW

NTSC Tuner

(TU302)

Rear AV_1

Rear S_1

Side AV_4

Side S_4

3

3

V,LR

Y/C

V,LR

Y/C

Mnt Out_

3

V,LR

L/R

Comp_1

Comp_2

MSP445

3

3

0

YCbCr

YCbCr

RGB-DTV/-PC

5

V

V

IN1

TV V5

IN1

OUT2

IN4

A/V SW

CXA2069

(IC101)

IN4

OUT1

OUT3

IN3

IN4

OUT1

CXA2181

IN2

(IC300)

V/Y,C

/3

TPNII

(LGDT1303)

LG POD

Controlle r

LPF

FMS6410

(IC608)

S

TP_V

1

TP_ENC

POD_TP0

TP_ENC

MPGE ENCODER

(BCM7040)

656 Data

Sub Video

Decoder uPD64011

(IC601)

LPF

FMS6410

(IC607)

LPF

FMS6407

(IC800)

/3

Main Video

Decoder uPD64011

(IC603)

ADC

AD9883A

(IC801)

HDMI Rx

SiI9993

(IC800)

000

001

010

MUX CPLD

XC95144XL

(IC900) 1394_IN_TP

1394_OUT_TP

011

100

VSB_T

000

001

1394_OUT_TP

010

POD_TP0

100

VSB_T

POD_TP0

00

01

10

Buffer

74FCT244

(IC1601)

Wired-

OR

Wired-

OR

TO PDP

Module

TP/D1

1394Link

TSB43DA42

(IC1100)

TPN_T

P

TPNII

EXT

HD-ll

LGDT1102

C

(IC401)

CON

(CN1102)

IEP-ll

LGDP441

1

(IC1305)

CON

(CN1101)

CON

(CN1102)

LVDS

THC63LVD103

(IC1302)


84

Here’s what we can do

Watch Live TV

Without buffering

Watch Live TV with

1 hour buffering

Watch Delayed Live

TV (1 hour max)

Play Recorded show

Record one show and play a recorded show

Record one show and watch another live **

** You can only record or watch one Digital Channel at a time however you can record one Analog Channel and watch another Analog Channel at the same time.


85

X Studio is the Customer

Interface to the DVR

• Home Menu Consists of:

- Recorded TV

- TV Guide

- Schedule

- Manual Rec

- TV Menu

• Home Menu Consists of:

- Recorded TV

- Photo List

- Music List

- TV Guide

- Reservation

- IEEE 1394

- TV Setup

• When you press X Studio, it displays the home menu with whatever was highlighted last.

• In home menu the HDD free space is displayed at the top.

• When you select TV menu or

TV Setup the traditional TV

Menu is displayed.

X Studio is on

DR and DRA series

Plasma and LCD

• In home menu, use ▲/▼ button and then ENTER or ▶button to select.

• Press the Xstudio or EXIT button to remove the OSD.


86

X Studio Pro is on

PY series Plasma

HDD Free Space is only an estimate

Record 1 hour of SDTV (480I)

* This is a completely blank HDD

Because video compression is used you can see that the HDD only shows 12 minutes of HD time or 27 minutes of SD time has been used to

Record 60 minutes of SDTV

Record 1 hour of HDTV (1080I)

In this case you can see that the HDD shows

34 minutes of HD time but 84 minutes of SD time has been used to record 60 minutes of

HDTV

NOTE: These times will vary


87

The Progress Bar

The Progress Bar can be brought up at any time by pressing the ENTER button

To make the Progress Bar disappear you can either press ENTER again, press

EXIT or simply wait about 10 seconds

The bar will be blue during delayed playback

The bar will be red during recording

The bar will be green during playback of a recorded show


88

HDD ERROR MESSAGES


89

Timer Recording Fail-1

Message

Timer recording cannot start due to HDD error.

Timer recording cannot start due to bad signal.

Timer recording cannot start. No recording space.

Timer recording cannot start. Reached maximum number of recordings.

Timer recording cannot start. Please set current time.

Timer recording cannot start. Channel is invalid.

Timer recording cannot start. Copy protected.

Timer recording cannot start. DVR device error.

Cannot display Auto Demo when timer recording starts.

Cannot display Photo List when timer recording starts.

Cannot display Music List when timer recording starts.

Stop current recording to start timer recording.

Stop current playback to start timer recording.

Set current time for timer recording.

Note

HDD problem. Bad sector or bad connection or other

Signal strength is too weak to start recording

HDD recording space is full

Maximum number of recorded program is 500. User must delete recorded program to start record.

Current time must be set before timer recording starts

Channel number is invalid

Current Program is copy protected

Device problem. Hardware error occurred.

starting timer recording. Auto Demo can start once recording is started.

starting timer recording. Photo list can start once recording is started.

starting timer recording. Music list can start once recording is started.

Current recording must be stopped before timer recording.

Current playback must be stopped before timer recording.

Current time must be set before timer recording starts


90

Timer Recording Fail-2

Message – timer record failed programs in RecordedTv list

Timer record failed due to no disk space.

Timer record failed due to no signal.

Timer record failed due to DVR device error.

Timer record failed. Reached maximum number of recordings.

Timer record failed. Recording duration is less than 10 seconds.

Timer record failed. Temperature is below zero.

Message – timer record failed programs in Gemstar PlayList

Timer record failed due to no disk space. Do you want to delete?

Timer record failed due to no signal. Do you want to delete?

Note


Signal strength is too weak


Maximum number of recorded program is

500. User must delete recorded program to start record.

Record length must be longer than 10 seconds

Temperature is too low

Note


Signal strength is too weak

Timer record failed due to DVR device error. Do you want to delete?

Timer record failed. Reached maximum number of recordings. Do you want to delete?

Timer record failed. Recording duration is less than 10 seconds. Do you want to delete?

Timer record failed. Temperature is below zero. Do you want to delete?


Maximum number of recorded program is

500. User must delete recorded program to start record.


Temperature is too low


91

Recorded Program Error

Message - From Gemstar Guide PlayList

Cannot play Recorded Program due to bad sector. Do you want to delete?

Cannot play Recorded Program due to copy protection. Do you want to delete?

Cannot play recorded program due to file error. Do you want to delete?

Message - From RecordedTv List

Cannot play Recorded Program due to bad sector.

Cannot play Recorded Program due to copy protection.

Cannot play recorded program due to file error.

HDD playback stops because of HDD problem.

HDD playback stops, cannot save clip editing because of HDD problem.

HDD playback halts due to HDD problem. HDD Recovery begins.

Delete a program which has been played because of HDD problem.

Delete all recorded programs because of DVR problem.

Note

HDD bad sector. Select “YES” to delete the program copy protected. Select “YES” to delete the program

Cannot find A/V file. Select “YES” to delete the program

Note

HDD bad sector.

copy protected.

Cannot find A/V file


HDD problem. Clip edit is not saved

HDD error recovery program has started

Fatal DVR error a HDD data is deleted

Fatal DVR error all HDD data is deleted


92

Recording Operation Error

Message

Recording halts due to HDD problem.

Stop recording due to copy protection.

Cannot record due to copy protection.

Do you want to stop recording before power off?

Recording stops as recording space is full

Recording stopped. Recovering from HDD error.

Recording stopped. No recording space.

Reached maximum recording duration.

Invalid input signal for recording.

Recording halts. HDD recovery will begin.

Recording cannot start No recording space.

Recording failed. Length is less than 10 seconds.

Reached maximum number of recordings.

Cannot change to another digital channel while recording digital channel.

Note

HDD problem. Recording stops

Copy protection detected during recording.

Copy protection detected before recording starts.

“Yes” will stop record. “No” will continue record. In both cases, display will be turned off


HDD error recovery program has started


Cannot add record duration if current record duration is

5hr or bigger.

Record is possible for only RF, Composite and 1394 signal

HDD error recovery program starts



Maximum number of recorded program is 500. User must delete recorded program to start record.

Watching digital channel while recording another digital channel is not possible


93

Timeshift Operation Error

Message

Timeshift stops because of HDD problem.

Timeshift cannot start. Audio only program.

Timeshift cannot continue. Audio only program.

Timeshift halts due to HDD problem. HDD Recovery begins.

Stop time shift due to copy protection.

Cannot time shift due to copy protection.

Note


Cannot Timeshift audio only channel

Cannot Timeshift audio only channel




Editing Operation Error

Message

Editing failed. Length is less than 10 seconds.

Editing failed. Length is less than 10 seconds. HDD playback stops.

Reached maximum number of clip editing's.

Note

Each clip edit length must be longer than 10 seconds

Maximum number of clip editing is 10.


94

Rename

Message

Please input new title.

Note

Must type new title

First character must be 0~9, a~z, A~Z. Please change new title.

First character must be 0~9, a~z, A~Z

Folder with the same name exist.

Must change folder name. same folder already exists

Reached maximum number of characters.

Maximum number of character is 16.

Others

Message Note

No HDD is detected. Please contact customer service h

Not enough HDD space.

HDD connection error.

HDD is full

Buffering stopped. Recovering from HDD error. HDD error recovery program has started

Cannot enter DVR Mode in current input source. DVR mode is possible for only RF, Composite and 1394 signal

Cannot play recorded program. Recorded program A/V file error

HDD is not detected. Please contact service center. Unknown HDD detection error.

No signal for DVR function.

Invalid input signal for DVR function.

Signal is too weak to enter Recording or Timeshift

DVR mode is possible for only RF, Composite and 1394 signal


95

Memory card

Message

Unable to create folder. Reached maximum number of folders.

Unable to create folder. No disk space.

First stop copying and retry M/C eject.

Copy protected. Unable to copy.

Not enough memory card space.

No memory card.

Unable to copy file.

Unable to move file.

Unable to delete file.

Unable to read file.

Unable to access. File or directory damaged.

Can't read data. Please remove memory card 1.

Can't read data. Please remove memory card 2.

Memory card 1 removed unsafely.

Memory card 2 removed unsafely.

Note

Maximum number of folder is 30.

HDD is full. Must delete a program/photo/music before record.

Cannot eject while copy operation is in progress

Cannot copy to memory card because it is copy protected.

Cannot copy to memory card because free space is too small.

Memory card not detected

Cannot copy

Cannot move

Cannot delete

Cannot read

Damaged file or memory card memory card 1 is not detected correctly memory card 2 is not detected correctly

Must press eject button and select memory card before removing

Must press eject button and select memory card before removing


96

HDD Recovery

Message

Bad sector occurred in critical regions of photo drive. Do you want to format photo drive?

Bad sector occurred in critical regions of music drive. Do you want to format music drive?

DVR initialization has failed.

DVR device error.

DVR needs HDD Initialization. Do you want to perform?

HDD recovery is in progress. Please try again later.

HDD recovery has failed. Please contact service center.

HDD initialization is in progress. Please try again later.

DVR initialization cannot start because of low temperature.

HDD recovery begins.

Do you want to format HDD?

HDD format has failed. Please contact service center.

Processing HDD format.

Note

Bad sector. Format photo-list

Bad sector. Format music-list

DVR initialization error.

DVR hardware error.

“Yes” will start DVR re-initialization.

HDD error recovery program in progress

Unknown HDD detection error.

DVR initialization in progress

DVR initialization cannot start.

HDD error recovery program starts

HDD error. “Yes” will start format

Unknown HDD detection error.

HDD error recovery program started


97

TROUBLE SHOOTING

Eliminate the HDD

• If you suspect the HDD is causing a video or audio problem you can simply unplug it

• You MUST unplug the TV before disconnecting or reconnecting the HDD

• During initial power up the TV will detect whether or not the HDD is there and will route the audio and video as needed


98

DVR TROUBLE SHOOTING

1

Check HDD power cable

2

Check HDD Signal Cable(SATA)

3

Check SiI3512

Power pins, Osc, PCI Bus, LED150

4

Check CPLD inputs

#140(CLK), #138(SOP), #137(Valid),

#139(Error),

#136(Data)

5

Check CPLD outputs

#78(CLK), #75(SOP), #77(Valid),

#76(Error),

#79(Data)

Check TPNII

LGDT1303

1.

Check HDD Power cable. #1: 5V, #4:12V

2.

Check HDD Signal cable (SATA)

3.

Check SiI3512(IC1500) inputs: Power pins, Osc

•

•

Check LED150 blinking

Check PCI bus

4.

Check CPLD(IC900) inputs:

5.

Check CPLD(IC900) outputs:


99

LG 50PC1DR Plasma TV Troubleshooting Manual

Assistant Bot

Overview of Topics to be

Discussed

•Switch Mode Power Supply

•Y SUS Board

•Z SUS Board

•X Drive Boards

PLASMA Overview

Troubleshooting Steps

SMPS Operating Modes

Power Sequence

Y SUSTAIN BOARD Troubleshooting

Waveform Adjustments Y SUSTAIN

• Ramp Up Used to shape the Y Drive Waveform by changing the pitch of the Top Ramp

• V SET DN Used to shape the Y Drive

Waveform by changing the pitch of the Bottom

Ramp

• V SET UP Used to shape the Y Drive waveform by leveling the Top Ramp

RAMP UP

Normal Waveform

Scope TP

Panel Waveform Adjustment

-VY

000

VSET UP

Ground VSET DN +VSC

Panel Waveform Adjustment

Ramp up too high

Ramp up too low

Panel Waveform Adjustment

Vset DN too low

Vset DN too high

Panel Waveform Adjustment

Vset UP too high

Vset UP too low

Panel Waveform Adjustment

-VY too low (-154vdc)

-VY too high (-227vdc)

Panel Waveform Adjustment

VSC too low (77 Volts)

VSC too high (140 Volts)

Y sustain board

Y Sustain Board

IPM (Intelligent Power Module)

How to check IPM

Y SUS

Y SUSTAIN

Y DRIVE BOARD

Troubleshooting

Y DRIVE Boards

Module check point

Z SUSTAIN Board Troubleshooting

Z SUSTAIN Board

Z SUSTAIN Voltage Distribution

Waveforms Z SUSTAIN Board

• Input signals to the Z SUS Board at P1 from the Control

Board are routed through IC1 and IC82 to the IPM.

These signals are used to develop the Z SUS Drive

Waveform to drive the PDP.

Z Board SUS Board

Z SUSTAIN Board

Z SUSTAIN BOARD

Z SUS IPM (Intelligent Power Module)

CONTROL Board

Troubleshooting

Control Board

X Drive Board

Voltages Supplied to the X Boards

Control Board to X Board

Address Signal Flow

TCP (Tape Carrier Package)

Center X Drive Board

Center X Board

X Board Voltage Distribution

RGB Address Signals out to TCP IC’s and PDP

X board

Vertical Line

How to check IPM (Dual Scan)

Module check point