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Plasma Display Panel Troubleshooting - 2008 1

50PC5 Plasma DisplayAdv anced Single Scan Troub leshoo t ing

Training Manual




50PC5D Plasma Display

Troubleshooting

Section 1

This Section will cover Contact Information and remind the Technician of Important Safety Precautions for the CustomersSafety as well as the Technician and the Equipment.

Basic Troubleshooting Techniques generally not thought of , which can save time and money will also be presented.

This Section will get the Technician familiar with the Disassembly, Identification and Layout of the Plasma Display Panel.

At the end of this Section the Technician should be able to Identify the Circuit Boards and have the ability and knowledgenecessary to remove and replace safely any Circuit Board or Assembly.

Overview of Topics to be Discussed

This Section will cover Circuit Board Operation, Troubleshooting and Alignment of the Switch Mode Power Supply,Y SUS Board, Y Drive Boards, Z SUS Board, Control Board, X Boards and the Main Board.

Section 2

A Summary of troubleshooting a condition of no picture will be discussed.




Preliminary Matters (The Fine Print)

IMPORTANT SAFETY NOTICE

The information in this training manual is intended for use by persons possessing an adequate background inelectrical equipment, electronic devices, and mechanical systems. In any attempt to repair a major Product,personal injury and property damage can result. The manufacturer or seller maintains no liability for theinterpretation of this information, nor can it assume any liability in conjunction with its use. When servicing thisproduct, under no circumstances should the original design be modified or altered without permission from LGElectronics. Unauthorized modifications will not only void the warranty, but may lead to property damage oruser injury. If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed forservice, they must be returned to their original positions and properly fastened.

Troubleshooting

CAUTION

To avoid personal injury, disconnect the power before servicing this product. If electrical power is required for

diagnosis or test purposes, disconnect the power immediately after performing the necessary checks. Also beaware that many household products present a weight hazard. At least two people should be involved in theinstallation or servicing of such devices. Failure to consider the weight of an product could result in physicalinjury.

Section 1




Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damagethe electronics in a manner that renders them inoperative or reduces the time until their next failure.Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively,you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Beforeremoving a replacement part from its package, touch the anti-static bag to a ground connection point orunpainted metal in the product. Handle the electronic control assembly by its edges only. Whenrepackaging a failed electronic control assembly in an anti-static bag, observe these same precautions.

Troubleshooting

REGULATORY INFORMATIONThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant toPart 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmfulinterference when the equipment is operated in a residential installation. This equipment generates, uses,and can radiate radio frequency energy, and, if not installed and used in accordance with the instructionmanual, may cause harmful interference to radio communications. However, there is no guarantee thatinterference will not occur in a particular installation. If this equipment does cause harmful interference to

radio or television reception, which can be determined by turning the equipment off and on, the user isencouraged to try to correct the interference by one or more of the following measures: Reorient or relocatethe receiving antenna; Increase the separation between the equipment and the receiver; Connect theequipment to an outlet on a different circuit than that to which the receiver is connected; or consult thedealer or an experienced radio/TV technician for help.

ESD NOTICE

Preliminary Matters (The Fine Print)




Contact Information

Customer Service (and Part Sales) (800) 243-0000Technical Support (and Part Sales) (800) 847-7597

USA Website (GCSC) aic.lgservice.comCustomer Service Website us.lgservice.com

LG CS Academy lgcsacademy.com

Published March 2008 by LG Technical Support and Training

Troubleshooting

The responsible party for this device’s compliance is:

COMPLIANCE

LG Electronics Alabama, Inc.201 James Record Road,Huntsville, AL, 35824.




Safety & Handling Regulations

1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.2. Check the model label. Verify model names and board model matches.

3. Check details of defective condition and history. Example: Y Board Failure, Mal-discharge on screen, etc.

1. Approximately 10 minute pre-run t ime is required before any adjustm ents are performed.2. Refer to the Voltage St icker inside the Panel when m aking adjustm ents on the Power Supp ly, Y SUS and Z SUS Boards .

Always adjust to the specified voltage level (+/- ½ volt).

3. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, check that the Power Supplyand Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.

4. C-MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity.5. The PDP Module must be carried by two people.6. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.7. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.

Checking Points to be Considered

PLASMA OVERVIEW Troubleshooting

50PC5D




Basic Troubleshooting Steps

• Define Look at the symptom carefully and determine what circuits could be causing the failure. Use yoursenses 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 willchange 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 athorough examination using your senses the first check should always be the DC Supply Voltages to those circuitsunder test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the suppliesare 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 finaldetermination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for theproper Duty Cycle of the signals. Sometimes “glitches” or “road bumps” will be an indication of an imminent failure.

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

Troubleshooting

Define, Localize, Isolate and Correct




This section of the manual will discuss Disassembly, Layout and CircuitBoard Identification, of the 50PC5D Advanced Single Scan Plasma Display Panel.

Troubleshooting

Upon completion of this section the Technician will have a better understanding of the disassembly procedures, the layout of the printedcircuit boards and be able to identify each board.

Disassembly




50PC5D Disassembly ProcedureBack Cover Removal

Troubleshooting

To remove the Back Cover remove the 35 screws as shown (the stand will not need to be removed).

Disassembly




50PC5D Circuit Board Layout and IdentificationTroubleshooting

50PC5D Back Cover Removed

Bottom Y Drive

Top Y Drive

Y SUS

Main

SMPS

ControlZ SUS

Left X Board Center X Board Right X Board

FAN

Speaker Speaker Keyboard

Voltage Sticker

Disassembly




Troubleshooting

50PC5D

Input Jacks

Circuit Board Layout and Identification

Software UpgradesMenu, Option, 7, 7x

Disassembly




TroubleshootingDisassembly Procedure for Circuit Board Removal

Switch Mode Power Supply Board Removal

Remove 8 screws securing the Power Supply and disconnect connectors from plugs CN101 ( AC Input )P805 ( VS, VS, VS, NC, GND, GND, GND, GND, VA, VA ), P804 ( GND, GND, VCC, Vcc ), P801 ( POD, 5VMONI,VS-ON, GND, STBY5V, RL-ON, AC-ON ), P803 ( GND, GND, 12V, 12V, GND, GND, 6V, 6V, GND, GND, 3.4V, 3.4V ),P802 ( GND, 12V, GND, 3.4V, GND, 6V, GND, GND, 19V, 19V ) after the board is replaced readjust RV401 ( VS ),RV501 ( VA ) and RV601 ( VCC ) for DC voltage levels indicated by the Voltage Label in the upper right corner of the PDP.

Y SUS Board Removal

Remove 13 screws securing the Y SUS Board and disconnect connectors from plugs P4 ( 5V, 5V, GND, GND, GND,NC, VA, VA, NC, VS, VS ), P7 ( VS, VS, VS, NC, GND, GND, GND, GND, VA, VA ), P8 ( GND, GND 5V, 5V )P9 ( GND, GND, GND, GND, 5V, 5V, 5V, 5V ), P1 ( Logic Signals from the Control Board ) P3 ( GND, GND, 5V, 5V, NC,VA,VA ), P2 ( GND, 5VF, GND, YNSC, OC1, OC2, DATA, STB, GND, CLK, GND ) after the board is replaced thecontrols will need to be adjusted VSC VR53, V SET UP VR51, V SET DOWN VR52. see procedure in the manualfor adjustment instructions.

Top Y Drive Board Removal

Remove 6 screws securing the Top Y Drive Board and disconnect connectors from plugs P5 ( GND, CLK, GND, STB,DATA, OC2, OC1, YNSC, GND, 5VF, GND ), P6 ( GND, CLK, GND, LE, DATA, OC2, OC1, GND, 5V, GND ) P1 , P2 ,P3 , P4 ( Ribbon Cable to the PDP ).

Notes: 1) All Plugs listed are from left to right Pin 1,2, 3, ETC.2) Remember to be cautious of ESD as semiconductors are CMOS and prone to static failure

Bottom Y Drive Board

Remove 6 screws securing the Bottom Y Drive Board and disconnect connectors from plugs P105 ( GND, 5VF, GND, YNSC,OC1, OC2, Data, STB, GND, CLK, GND ), P101 , P102 , P103 , and P104 ( Ribbon Cables to the PDP ).

50PC5D




Z SUS Board Removal

Remove the 6 screws securing the Z Sus Board and disconnect connectors from plugs P7 ( 5V, 5V, GND, GND, GND, GND,NC, VA, VA, NC, VS, VS ), P1 ( Logic Signals from the Control Board ), P72 ( GND, GND, 5V, 5V, NC, VA, VA ), P73 ( GND,GND, 5V, 5V, NC, VA, VA ), P31 ( FPC to Display Panel ), P32 ( FPC to Display Panel ), P33 ( FPC to Display Panel).

TroubleshootingDisassembly Procedure for Circuit Board Removal

Main Board Removal

Remove the Input Jack Faceplate by first removing 2 screws by the AC Input Filter, 4 screws at the HDMI Input Plugs,the nut and washer from the Antenna / Cable Input and the RS232 and PC Cable Securing Posts, the Faceplate can nowbe removed. After removing the Faceplate, remove the 2 screws holding the bottom of the Main Board to the support frame,and release the 2 Plastic Mounting Posts at the top of the board. Disconnect the connectors from plugs P4004 ( AC DET,RL-ON, INV-ON/OFF, GND, PWM, 6V, GND, LIVE ON ), P4005 ( 3.3V, 3.3V, GND, GND, 6V, 6V, GND, GND, 12V, 12V,

GND, GND ), P4003 ( 19V, 19V, GND, GND, NC, GND, 3.3V, GND, 12V, GND ), P6001 ( LVDS ) P6007 ( FAN ),P7009 ( Right Speaker ), P7010 ( Left Speaker ), P5002 ( AV Input 2 ), P4007 ( Keyboard ).

Control Board Removal

Remove 2 screws securing the Main Board Mounting Bracket Assy. and disconnect connector from plug P1 ( LVDS ) onthe Control Board, release the strain from the Fan Cable, and carefully place the Bracket Assy. off to the side. Remove 4Screws and mounting hardware securing the Control Board and disconnect connectors from Plugs P300 ( 5V, 5V, 5V, 5V,GND, GND, GND, GND ), P200 ( Y SUS Logic Signals ), P5 ( Z SUS Logic Signals ), P2 ( Left X Board RGB Logic Signals ),P4 ( Center X Board RGB Logic Signals ), P6 ( Right X Board RGB Logic Signals ). Remember to reinstall all the Heat TransferHardware over to the new Control Board.

50PC5D




Disassembly Procedure for Circuit Board Removal Troubleshooting

X Board Removal

X Board Removal will require the most disassembly of all the boards. All the brackets and assemblies marked with an“A” will need to be removed including the Stand. Before an X Board can be removed the Heat Sink Assembly will also needremoval.

A A

A

A

A A

FPC

50PC5D

A




Disassembly Procedure for Circuit Board Removal Troubleshooting

X Board Removal (continued)

Disconnect the cable from AC Input Filter to the Switch Mode Power Supply at CN101 . Disconnect the connectors from

plugs P801 , P803 , and P802 from the SMPS Board. Carefully remove the LVDS Cable from the Control Board P1 bypressing the Locking Tabs together and pulling straight back to remove the cable see illustration below.

Locking Tabs Locking Tabs

LVDS Cable Connector

Remove the Fan Connector from Plug P6007 on the Main Board and carefully reposition the Main Board Mounting Bracketoff to the side. Remove the Brackets marked “A” as previously noted. Remove 20 screws holding the ( 2 ) Heat Sinks andcarefully lift them straight up and off ( remember that the TCP IC’s are located under the HEAT SINK ).

50PC5D




Z SUSBoard

5v, VA, VS

VA, VS

5V VCC

5v, VA

5v, VA

Switch ModePower Supply

Y SUSBoard

Center X Drive Board

ControlBoard

5v, VA

5V

5v, VA5v, VA

Logic Signals

RGB Logic Signals

RGBLogic Signals

RGBLogic Signals

Logic Signals

5v, VA

Y Drive Top

5V, VA

Y Drive Bottom

Drive Signal

Signal and Voltage Distribution Troubleshooting

AC Input Filter

Logic Signals

Display PanelDisplay Panel

MainBoardLVDS

Left X Drive Board Right X Drive Boards

Display Panel

5V

50PC5D

Control/ STB5V19, 12, 6, 3.4

Voltages




Signal and Voltage Distribution (Wiring Diagram) Troubleshooting

50PC5D

AC INPUT

Fan

POWER SUPPLY

Z SUS

Y SUS

MAIN

Control

Left X Right X

Y

Dr ive

Y

Dr

ive

Key Board

A/V Input

Center X

MCM

IPM

IPM

IPM

IPM

P805

P804

PKG4

P801 P803 P802CN101

P2 P4P7

P8

P9

P1

P3

P5

P72P73

P1

P71P31

P32

P33

P7 P3 P1

P5

P6

P4P2

P200

P300

Tuner IC1001

Z BiasBlock

P4004 P4005 P4003 P6001 P6007

P5002

P7009

P7010Speakers

P4007

P208 P200P100 P109 P308 P300




50PC5D Plasma DisplayTroubleshooting

Section 2

This Section will cover Circuit Operation, Troubleshooting and Alignment of the Power Supply,Y SUS Board, Y Drive Boards, Z SUS Board, Control Board, Main Board and the X Drive Boards.

At the end of this section the technician should understand the operation of each circuit board and

how to adjust the controls. The technician should be able with confidence to troubleshoot a circuitboard failure, replace the defective circuit and perform all necessary adjustments.




This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for theSingle Scan Plasma. Upon completion of the section the technician will have a better understanding ofthe operation of the Power Supply Circuit and will be able to locate voltage and test points needed fortroubleshooting and alignments.

• DC Voltages developed on the SMPS• Adjustments VA, VS, and 5V VCC

• Always refer to the Voltage Sticker located in the upper right side of the PDP for the correctvoltage levels for the VA, VS, 5V VCC, V SET UP, Vscan and Z Bias as they will vary fromPanel to Panel.

V SET_UP Vscan

Model : PDP 50X4 ####All Voltage : DC 5VVa : 58V Vs : 193V100 / NA / 125 / NA / 100Max Watt : 400 W ( Full White )

Z_BIAS

SWITCH MODE POWER SUPPLY Troubleshooting

50PC5D




Troubleshooting

50PC5D

There are 2 different Power Supply Boards used in the 50PC5D Model Lines.One Board ( 6709V00001A ) is used in a Korean made PDP.

The other ( EAY32957901 ) is used in a Mexican made PDP.Check the sticker on the upper left side to confirm origin of the PDP.

We will examine the Operation of both Boards but the main focus will bethe Power Supply that drives the Korean Made PDP.

SWITCH MODE POWER SUPPLY




Troubleshooting50PC5D

The Switch Mode Power Supply Board Outputs to the :

VA Y SUS Board

Main Board

VS

5V VCC

Primarily responsible for Display Panel Vertical Grid

Drives the Display Panel Horizontal Grid

Used to develop Bias Voltages on the Y SUS, Z SUS,X Drive, and Control Boards

19V Audio B+ Supply

12V

6V

3.4V

Signal Processing Circuits and Fan Drive

Signal Processing Circuits

Control Circuits

Adjustments There are 3 adjustments located on the Power Supply Board VA, VS, and

5V VCC. All adjustments are made with relation to Chassis Ground.

5V VCC

VA

VS

RV601

RV501

RV401





5V VCCRV601

VA RV501

Troubleshooting

VS RV401

50PC5D

6709V000011A Sw itch Mode Pow er Supp ly

AC InputCN 101

P805

P804

P801 P803 P802

ACGND

380V Source

AC Input

VS Source

VA Source

StandbySource

19v, 12v,6v, 3.4vSource


PKG4Sub Micon




Troubleshooting

VA RV901

AC InputSC101AC Input Circuit

380V Source

VS Source

VA Source

Standby, 19, 12, 6, and 3.4VSourceSub Micon

U701

VS RV951

3.4V ADJVR251

P812

P811

P800

P802

P803

50PC5D

EAY32957901 Switch Mode Pow er Supply





DD Converter NJM2374+AP40P03G1

Vs

AC INPUT ( 100-120V )

EMIFilter

In Rush

CurrentLimit

RELAY

Rectifier

PFC

Rectifier

Vcc

AC DETPFC UV/OV

Control ICNCP1217

Control IC

KA7552

Control ICL6598

MULTI&

STBYTrans

VaTrans

VsTrans

Vs/Va discharge

Va

3.4V

STBY 5V

5V (Vcc)

19V

12V

6V

Regulator KTC3200+FQPF27P6

Regulator KIA278R121

Switch AP60T03GH

Regulator

KIA431+FQPF13N06L

Regulator KIA278R05P1

Troubleshooting

50PC5DSWITCH MODE POWER SUPPLY

EAY32808901




Troubleshooting

50PC5D

Power Supply Operation and Troubleshooting

AC Voltage is supplied to the SMPS Board at Connector CN101 from the AC Input Filter. Standby 5V is developedfrom Transformer T121 and from pin 4 of Z602 and is routed to 2 circuits, first the Micro Processor IC4015 via P801Pin 5 to the Main Board and second to the Sub Micon Board PKG4 on the SMPS, where AC – ON / DETECT isdeveloped and sent from to Pin 7 of P801 to IC4015. With the presence of both 5V STB and AC – ON/ DETECT,IC4015 is active.

When IC4015 receives an “ ON “ Command from either the Keyboard or the Remote IR Signal it outputs a highto RL-ON which enters the SMPS Board at Pin 6 of P801. The high RL-ON Signal then is sensed by the

Sub Micon Board PKG4 which causes the Relays RL101 and RL102 to close turning on the 380V Supplydeveloping the 19V,12V, 6V and 3.4V Voltage Sources.

The next step is for IC4015 to output a high on POD Line to the SMPS at P801 Pin 1 which is sensed by the PKG4Sub Micon Board turning on the 5V VCC line.

The last step to bring the supply to “Full Power” occurs when IC4015 brings the VS-ON line high at Pin 3 of P801on the SMPS Board which when sensed by the PKG4 Sub Micon Board turns on the VA and VS Supplies.






Understanding the Power On Sequence when Troubleshooting a possible Power Supply Failure willsimplify the process of isolating which circuit board failed to operate properly. In this Section we willinvestigate the Power on Sequence and examine ways to locate quickly where the failure occurred.

Check the Power On LED for Operation a Red LED indicates a presence of 5V STB and AC-ON/DETECTFailure of the Power ON LED to light is an indication of loss of 5V STB or AC ON/ Detect remember the 5V STB

and AC-ON/DETECT are developed on the SMPS and sent to the Main Board.

Listen for Relay Click, the click of the Relay is an indication of RL-ON going high. RL-ON is sent from theMain Board to the SMPS and when present the PKG4 controls the Relay Operation. RL-ON going High andno Relay is a failure of the SMPS, RL-ON staying low is a failure of the Main Board.

Relay Operation means that the SMPS if working properly will output 19V, 12V, 6V, and 3.4V to the Main Board.These voltages will allow the Tuner, Audio and Video Circuits on the Main Board to function, and if connected to an

Antenna Input, Audio would be present. If the Relays closed and these supplies failed suspect a problem with theSMPS.

The next step of operation calls for the POD line from the Main Board to the SMPS to go high. A high on thePOD Line activates the 5V VCC line. Loss of 5V VCC results in no “Raster”, no Reset, no Y, Z, Control or X Boardoperation. Loss of 5V and POD going high could be caused by any of these boards or failure of the SMPS. PODStaying low indicates a problem on the Main Board.

Remember if a voltage is missing check for proper resistance before proceeding

VS-ON is the last step of the Power Sequence and is responsible for bringing the VS and VA Voltages up.The VS-ON signal is sent from the Main Board to the SMPS as a high, VS and VA and full operation of theDisplay Panel are now enabled. Loss of VS-ON results in loss of VA and VS and no Raster, no Resetbut Audio would be present. If VS-ON went high and VS and VA where missing the problem could be causedby a failure on the SMPS or a circuit using these voltages. A Resistance check should narrow the possiblefailures quickly.





Troubleshooting

50PC5D

The Operation of the Power Supply can be Confirmed by removing the SMPS Board and placing it in theService Position. Place two 60Watt lamps in series across pins 1,2,3 ( VS ) and 5,6,7,8, ( Ground ).

Apply AC Power and check for 5V STB and AC-ON / DETECT at P801, if present remove AC Powerand install a 100 Ω ¼ watt resistor from 5V STB to RL-ON on Connector P801. Apply AC Power The AC Relays should close and 19V, 12V, 6V, and 3.4V should be Present. If ok remove AC Power.

Install a 100 Ω ¼ watt resistor from 5V STB to POD on Connector P801, 5V VCC should now become active,If present remove AC Power.

Install a 100 Ω 1/4 Watt resistor from 5V STB to VS-ON on Connector P801, VS and VA should now bePresent. This test will confirm the normal operation of the SMPS. 6709V00001A

This test can confirm the proper operation of the SMPS without the need to exchange the boardfor testing purposes.

6709V00001A SMPS Board

EAY32957901 SMPS Board

This Power Supply operation can be confirmed in the same manner. Place a 100 Ω ¼ watt resistor from5V STB to VS-ON be sure to place the ( 2 ) 60 Watt lamps across VS and Ground on P812.





Troubleshooting

AC - ON

RL-ON

ST – 5V

GND

VS-ON

5V - MT

POD

Resistors 100 Ohms ¼ Watt

P801

50PC5D



P805

P804VS

GND

PKG4

P801 P802P803

CN101

VA

6709V00001A

( 2 ) 60W

Light Bulbs

Model : PDP 50X4 ####All Voltage : DC 5VVa : 58V Vs : 193V

100 / NA / 125 / NA / 100Max Watt : 400 W ( Full White )




Troubleshooting

50PC5D


P812

P811VS

GND

SC101

P800

P802

P803

EAY32957901

100 Ω ¼ Watt Resistor from STB5V to VS-ON


( 2 ) 60WLight Bulbs

P8003.4_ ON

NC

6V

NC

GND

STB5V

M5-VON

5V-MNT

VS-ON

GND

STB5VRL-ON

AC-ON/ DET1

13

Model : PDP 50X4 ####All Voltage : DC 5VVa : 58V Vs : 193V100 / NA / 125 / NA / 100Max Watt : 400 W ( Full White )

VA




Troubleshooting50PC5DVoltage and Resistance Measurements for the SMPS 670900001A

Standby Run ResistanceConnector Pin Number

CN101 120VAC 120VAC 480K

P801 0V 21.9K10V 4.7K0V 22K

0V GND4.9V 5.38K

23

456 0V 22K7 4.1V 11.8K

P802 1 0V GND2 0V 1.6K3 0V GND

4 0V 22.6K5 0V GND6 0V 2.6K789

10

0V0V0V0V

GNDGND9.7K9.7K


Resistance Readings with the PCB Disconnected

P804 1234

0V0V0V0v

3.7V4.9V3.7V

0V4.9V3.6V4.1V

0V11.9V

0V

3.4V0V

5.9V0V0V

19.4V19.4V

0V0V5V5V

GNDGND4.16K4.16K





Voltage and Resistance Measurements for the SMPS 670900001A


P803 123456789

1011

0V0V0V0V0V0V

0V0V0V0V

0V

0V0V

11.9V11.9V

0V0V

5.9V

0V5.9V

0V3.4V3.4V0V12

GNDGND

6K6K

GNDGND3.4K3.4KGNDGND16K16K



P805 1234567

8910

0V0V0V0V0V0V0V

0V0V0V

193V193V193V

0V0V0V0V

0V5.8V5.8V

1.02 MEG1.02 MEG1.02 MEG

NCGNDGNDGND

GND5.4 MEG5.4 MEG




Troubleshooting

50PC5D

Voltage and Resistance Measurements for the SMPS EAY32957901Standby Run ResistanceConnector Pin Number

P802 1234

56789

10

0V0V0V

0V

0V

0V

0V0V

0V0V

19V19V

GNDGND

6VGND3.4VGND12V

GND

1.8K1.8KGNDGND

4.8KGND60 ΩGND7K

GND

P811 1234

0V0V0V0V

5V5V

GNDGND

GNDGND

2.6K2.6K



P800 123456789

10111213

GND

5.1V1.7V5V

GND4.8V4.9V4.9V3.3V

NC6VNC

4.4V

5.1V0V5.1VGND0V0V0V3.3VGNDNC0VNC0V

3.4 MEG99.9k

1.7KGND100K3.3K13K1.7KGNDNC

4.8KNC

100k




Troubleshooting

Voltage and Resistance Measurements for the SMPS EAY32957901Standby Run ResistanceConnector Pin Number

P812 123456789

10

0V0V0V0V0V0V0V0V0V0V

60V60VGNDGNDGNDGND

NC192V192V192V

16.8K16.8KGNDGNDGNDGNDNC

4.9K4.9K4.9K



12345678

9101112

12V

3.4V3.4VGNDGND6V6VGNDGND

12VGNDGND

60 ΩGNDGND4.9K4.9KGNDGND

7.2K7.2KGNDGND

P803 60 Ω0V0V0V0V0V0V0V

0V0V0V0V

50PC5D




• Adjustments• DC Voltage and Waveform Checks• Resistance Measurements

Troubleshooting Y SUSTAIN BOARD

This Section of the Presentation will cover troubleshooting the Y SUS Board for the SingleScan 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 andresistance test points needed for troubleshooting and alignments.

50PC5D

Operating Voltages

SMPS Supplied VAVSVCC 5V

Y SUS Developed -VYV SET DNRamp UP

Y ER

VA supplies the Panel Vertical GridVS Supplies the Panel Horizontal Grid5V Supplies Bias to Y SUS, Z SUS, Control, and X Boards

-VY Sets the Negative excursion of the Y SUS Drive WaveformV Set Down sets the Pitch of the Bottom Ramp of the Drive WaveformRamp UP sets Pitch of the Top Ramp of the Y Drive Waveform

Y ER is being used to Monitor IPM Currents




Troubleshooting Y SUSTAIN BOARD 50PC5D

P2

P4

IC 12SUS IPM

IC 9ER IPM

P7

P8

P9

P1

P3 5V and VA to Left X Board

Logic Signals fromthe Control Board

V SCAN TPs

V SCAN ADJ VR5

V SET UP VR 51

Oscilloscope TP B9

V SET DN VR 52

Logic Signals tothe Y Drive Boards

Y Drive Output

5V VCC Inputfrom the SMPS

5V VCC Output tothe Control Board

VS and VA Inputfrom the SMPS

VS, VA and 5V VCCOutput to the ZBoard

-VY R85




Troubleshooting Y SUSTAIN BOARD 50PC5D

FS105 ( 18V IPM )

FS101 ( VS )

FS102 ( VA )

5VMeasured fromFloating Ground

Floating Ground

Y Drive Output

Floating Ground

Measured at ResistorR85 (-130V)

FS 103 ( 5V VCC )

-VYFS104 ( 5V VCC )




Norm al Y Drive Waveform

Panel Waveform AdjustmentTroubleshooting Single Scan Panel

VSC TP

VR5 (VSC)

Oscilloscope TP B9

VR52 V SET DOWN

VR51 V SET UP

10+/- 5µs

Set-down Set-up Set-down

292 +/- 5V





Vset UP too high

Vset UP too low

V SET UP Changes the Am pli tude at the Top of th e Waveform

Rotated Fully CCW

Rotated Fully CW

Adjusted Fully CCW results in Clipping, and HigherAmplitude of the Top of the Waveform

Adjusted Fully CW results in Lower Amplitudeof the top portion of the Waveform

T bl h i Si l S P l




Rotated Fully CW Adjusted Fully CW causes the BottomRamp to become too Shallow

Vset DN too high

Rotated Fully CCW Adjusted Fully CCW causes the BottomRamp angle to become too Steep


V SET Down Ch anges the Pi tch of th e Bottom Ramp

Vset DN too low

bl h l l





VSC too low (77 Volts)

VSC too high (140 Volts)

VSC adjusts the V Scan L evel of the Drive Waveform

Rotated Fully CW

Rotated Fully CCWAdjusted Fully CCW increases the Amplitude of

the V Scan portion of the Waveform

Adjusted Fully CW decreases the Amplitude ofthe V Scan portion of the Waveform

T bl h ti g




50PC5D Y SUS Board Block Diagram

VS

VSC -VY

VSCAN

Logic SignalsFrom Control

Board

5V Vcc

VA

IC12SUS IPM

Y DRIVEOUTPUTCIRCUIT

5V Out to theControl Board

VS

VS

5V

5V

18v IPM

18v IPM

Sus up_ out

FS501

Sus out

ER UP_OUT

ER DN_OUT

ER UpER

Down

Sus upSus Down

IC9ER IPM

SwitchingFET’s

FS101FL101

FS103

FS102

P4

P7

P9

P1

P3

P2

Y Drive

Power Supply

Power SupplyY Drive

Y Drive

GND

T3

P8

VS

Troubleshooting Y SUSTAIN BOARD

R43D41

VER

TO Z SUS Board

T bl h tiY SUSTAIN BOARD




Generates Vsc, -Vy and V Set Upfrom Vs by transformer

Control Board

Diagram of Y Sustain Board

IPM’s generateSustain Waveform

Troubleshooting

Distributes 5V VA VSDistributes 5V

Logic signalsneeded to

generate drivewaveform

Distributes 5V VA

Receive 5V VCC, Va, Vsfrom SMPS

Transfer Waveformto Y Drive Board

Z SUS Board

Left X Board

Display Panel

Power Supply Board - SMPS

FETs amplify SustainWaveform

50PC5D Y SUSTAIN BOARD

TroubleshootingY SUSTAIN BOARD




IPM ( Intelligent Power Module )

There are Two IPMs used in 50PC5D on the Y Sustain Board.

1. SUS IPM ( IC9 )

2. ER IPM ( IC12 )

Role of IPMs on the Y SUS Board

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

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

SUS_DNUS_DN

SUS_UP

ER_UP ER_DN

Troubleshooting50PC5D Y SUSTAIN BOARD

TroubleshootingY SUSTAIN BOARD 50PC5D




Troubleshooting Y SUSTAIN BOARD 50PC5DHow to Check IPMs

( Resistance “ Diode Check”, Board Removed from Set

Test Points referenced from the silk screenfound on the bottom of the PC Board.

GND SUS_OUT .348

GND VS .821

SUS_OUT Y SUS_DN ∞

GND YSUS_DN ∞

IC12

SUS_OUT GND

VS GND

YSUS_DN SUS_OUT

YSUS_DN GND

IC9

∞

∞

.444

∞

GND VY ∞

VY GND .388

SUS UP_OUT VS .352

GND VS .536

GND SUS UP_OUT .344

GND VER .512

VSER DN_OUT .349

VS SUS UP_OUT

VS GND

SUS UP_OUT GNDVER GND

ER DN_OUTVS

∞

∞

∞

∞

∞

+ -+ -

+ -

TroubleshootingY SUSTAIN BOARD




Troubleshooting

50PC5D Y SUSTAIN BOARD

Voltage and Resistance Measurements for the Y SUS BoardStandby Run ResistanceConnector Pin Number

123456

789

101112

1.8V

GND5V5V0V5V0V

5V0V

0V.70V

3.4K 8

GND

8

4.2 MEG3.9K

4.2 MEG4.2 MEG

8

4.2 MEG 8

0V0V0V0V0V0V

0V0V0V0V0V

P23.6K

0V


1234567

58V58V

GNDGND

5V5V0V

5.2 MEG

GNDGND

8

6.5 MEG

0V0V0V0V0V0V

P3

5.2 MEG

0V6.5 MEG

1234

5V5V

GNDGND

2.9 MEG

GNDGND

0V0V0V0V

P8

2.9 MEG

TroubleshootingY SUSTAIN BOARD 50PC5D




g Y SUSTAIN BOARD

Voltage and Resistance Measurements for the Y SUS Board


Standby Run ResistanceConnector Pin Number 1234567

89101112

58V

5V5V

GNDGNDGNDGNDNC

58V

NC193V193V

4.6MEG

GNDGNDGNDNC

6.8 MEG6.8 MEGNC

4.2 MEG4.2 MEG

0V0V0V0V0V0V

0V0V0V0V0V

P4 4.6MEG

0V

GND

123456789

10193V

58V58V

GNDGNDGNDGNDNC

193V

193V

5.5 MEGGNDGNDGNDGNDNC

5.5 MEG5.5 MEG5.5 MEG

0V0V0V0V0V0V

0V0V0V

P7 5.5 MEG

0V

12345678

5V5V5V

GNDGNDGNDGND

4 MEG4 MEG

4 Meg

GNDGNDGNDGND

0V0V0V0V0V0V

0V

P94 MEG

0V

5V

50PC5D

TroubleshootingY DRIVE BOARDS




Y-Drive Board works as a path supplying the Sustain and Reset waveforms which aremade in the Y SUSTAIN B/D and sent to the Panel through SCAN DRIVER IC’s .

The Y Drive Boards supply a waveform which selects the horizontal electrodes sequentially.

* 50PC5D uses 10 DRIVER ICs on 2 Boards (TOP, BOTTOM: 5 each)

50PC5D

Top Drive Board

Y DRIVE BOARDS

Y DRIVE WAVEFORM





50PC5D

Y DRIVE BOARDS

P5

IC1 IC2 IC3 IC4 IC5

P1 P2 P3 P4

P6

Logic Signals from the Y SUS Board

Logic Signals to the Bottom Y Drive Board

5 Volts and Logic Signals from Y SUS Board are supplied to the Top Drive Board onConnector P5, 5 volts inputs at Pins 10 and 11 ( reference to Floating Ground ) and enter theBottom Y Drive Board at P6.





50PC5D

To remove the Ribbon Cable from the connector first carefully lift the Locking Tab fromthe back and tilt it forward ( lift from the outside edge as shown in Fig 1). Gently slide the

Ribbon Cable free from the connector.

Fig 1

To reinstall the Ribbon Cable carefully slide it back into the slot see ( Fig 2 ), be sure it is seatedsecurely and press the Locking Tab back to the locked position see ( Fig 3).

Fig 2 Fig 3

Y DRIVE BOARDS

TroubleshootingZ SUSTAIN BOARD




This Section of the Presentation will cover troubleshooting the Z-SUS Board Assembly. Uponcompletion of this section the Technician will have a better understanding of the circuit and be ableto 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 VAVS5v VCC

Developed on Z SUS Z Bias

IPM 18v

50PC5D





Input Voltages from the Y SUS Board

VS VS is input at P71 pins 11 and 12 and supplied to IC12 the IPM IC through coil FL73.

VA VA inputs at P71 pins 8 and 9 and to Resistor R17 and Diode D18 then to the IPM at VER1and also to P71 and P72 for the Center and Right X Boards.

5v 5v is used to Bias the circuits on the Z_ SUS Board. 5v also feeds connectors P71 and P72for the Center and Right X Boards.

Voltages Developed on the Z SUS Board

Z Bias Z Bias Voltage is used to Bias the output circuits driving the Sustain and Erase Pulses , removing previousimages from the PDP. Z-bias is measured from the Vzb TP on the Z SUS Board and adjusted by VR41.

IPM 18v IPM 18V needed to generate the Sustain and Erase Pulses in the IPMs. Measured at FS41 surface mount fuse.

50PC5D





50PC5D

Z Bias Control

VR41

P31 P32 P33

P72

P73

P1P71Logic Signals fromthe Control Board

Supply Voltages fromthe Y SUS Board, VA, VS, and 5V VCC

Output to the Display Panel

IC12

Troubleshooting50PC5DZ SUSTAIN BOARD




IPM18v Vcc

VS FL73

P71

P1

P71 P72P33

P32

P31

5 V

IC 1

LOGIC

VA

GND

Q52Q53

L2L3L4L5

SUSOUT

D17

D59

IPM

IC12

Z BiasBlock

From the YSUS Board

Logic Signalsfrom theControl Board

Output tothe PDP

Output tothe PDP

Output tothe PDP

Output to the X Boards

D12 D13

50PC5DTroubleshootingZ SUSTAIN BOARD




50PC5D

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 (FlexiblePrinted Circuit (Z).

Scope Probe connect point ResistorR7 connect to check Z Output

waveform

Z DRIVE WAVEFORMZ

Vzb

V z b

Troubleshooting

50PC5DZ SUSTAIN BOARD




50PC5D

Z Bias Adjust VR 41, measurement from Q53 (DRAIN) VZB Test Point to Chassis Ground,Adjust to the level indicated on the Voltage Sticker on right side of the Panel.

18V IPM

VZB TP

Oscilloscope TP R7





50PC5D

Center and Right X Boards

Distribute 5V VCC, VA

IPM generates erase,sustain waveforms

Generates Z Bias18v IPM Vcc

Distributes Logic Signals

Distributes 5V VCC, VA, VS

FET Makes Drive waveform Display PanelVia FPC (flexible printed circuit )

Control BoardReceive 5V VCC, VA, VS

Y SUS Board

Z SUSTAIN BOARD Troubleshooting

50PC5D




There is one IPM ( Intelligent Power Module) on the Z sustain board the SUS_UP and SUS_DN

along with the ER_UP and ER_Down Functions are all controlled by IC12.

SUS_DNUS_DN

SUS_UP

ER_UP ER_DN

Z

Vzb

V z

b

IPM Intelligent Power Module

50PC5D

TroubleshootingZ SUSTAIN BOARD50PC5D




50PC5D

How to Check IPMs( Resistance “ Diode Check”, Board Removed from Set

Test Points referenced from the silk screenfound on the bottom of the PC Board.

IC12

SUS UP_OUT VS .349

GND VS .691

GND SUS UP .570

GND VER .506

VSER DN_OUT .349

VS SUS UP_OUTVS GND

SUS UP_OUT GNDVER GND

ER DN_OUTVS

∞

∞

∞

∞

∞

GND18V 1.96

.494GND 18V

+ -

+ -

Y SUS and Z SUS Panel Drive Output Circuits

50PC5DTroubleshooting

Summary




Y_SUS Z_SUS

N

C P

Panel

Vzb

ER_COM

SUS_OUT

SUS_UP

Vs

-Vy

ER_UP

ER_DN

SUS_UP

SUS_DN

V SetUp

PASS_TOP

SET_DN

SUS_DN

SUS_OUT

ER_UP

ER_DN

SUS_UP

SUS_DNZBIAS

Vs

Vzb

SCAN

N

N N

ER_COM

N

Vsc

50PC5D

IPMs control both Y and Z Board ER Up Down and SUS UpDown functions used to Drive the Display Panel

Summary

Troubleshooting Y/Z Drive Waveform Summary




50PC5D

Y Drive Waveform Y Drive Waveform

Z Drive Waveform Z Drive Waveform

Troubleshooting a no picture (no raster) symptom can sometimes be made easier by checking the Yand Z Drive Waveforms. The illustration above shows both waveforms at 100 and 400 μ s time durations.Since both waveforms are developed independently of each other, checking them will reveal which

circuit has failed. Make note of the wave shapes and phase relationship of the signals, distortion or lossof the signals when recognized will speed up the troubleshooting process and prevent the need toreplace circuit boards which are working normally.

Z SUSTAIN BOARD Troubleshooting




50PC5D


Standby Run ResistanceConnector Pin Number P72 / P73 0V GND GND1

0V GND GND0V 5V 2.7MEG0V 5V 2.7MEGNC NC NC

23456 0V 58V 4.8MEG7 0V 58V 4.8MEG

Voltage and Resistance Measurements for the Z SUS Board

1

23456789

101112

58V

5V

5VGNDGNDGNDGNDNC58V

NC193V193V

4.6MEGGNDGNDGNDGNDNC

6.8 MEG6.8 MEG

NC4.2 MEG4.2 MEG

0V

0V0V0V0V0V

0V0V

0V0V0V

P71 4.6MEG

0V

Troubleshooting

50PC5DCONTROL BOARD




This Section of the Presentation will cover troubleshooting the Control Board Assembly. Uponcompletion of this section the Technician will have a better understanding of the circuit and be ableto locate voltage and resistance test points needed for troubleshooting.

• DC Voltage and Waveform Test Points• Resistance Test Points

Operating Voltages

Y SUS Supplied 5v VCC

Developed on the 1.8VControl board (2) 3.3V

Main Board Supplied LVDS Signal

TroubleshootingCONTROL BOARD50PC5D




P200

P300

P2 P4

P6

P5

P1 LVDSP3P7 Temp Diodes

Part Number

X3

CONTROL BOARD Troubleshooting

50PC5D




IC3LGPCMx05W

MCM

P2 P4

P6

P5

LVDS

P1P3P7

P300

P200

IC5 IC8

IC1

Temp Diodes

Pin 1 ---- 5VPin2 ---- 3.3vPin 3 ---- 0V

Pin 1 ---- 5VPin2 ---- 3.3vPin 3 ---- 0V

Pin 1 ---- 3.3VPin2 ---- 1.8VPin 3 ---- 0V

Auto Test Pattern Generator Short Pin1 to Pin 2

Logic Signalsto the

Y SUS Board

Logic Signalsto the

Z SUS Board

RGB Logic Signals

to theLeft X Board

RGB Logic Signalsto the

Center X Board

RGB Logic Signalsto the

Right X Board

5V inputfrom theControlBoard

CONTROL BOARD Troubleshooting

50PC5D




Check the output of the Oscillator package.The frequency of the sine wave is 50 MHZ.Missing this clock signal can halt operation

of the unit

50Mhz

TroubleshootingCONTROL BOARD50PC5D




LVDSVideo Signals from the Main Board to the Control Board are referred to as Low Voltage Differential Signalsor LVDS. Their presence can be confirmed with the Oscilloscope by monitoring the LVDS signals with noinput signal selected while pressing the Menu Button “on” and “off” with the Remote Control or Keypad.Loss of these Signals would confirm the failure is on the Main Board!

Example of Normal Signals measured at 200mv/cm at 5µs/cm.

Menu Off Menu ON

LVDS Cable

TroubleshootingCONTROL BOARD 50PC5D




This Picture shows Signal Flow Distribution to help determine thefailure depending on where the it shows on the screen.

The Control Board supplies Video Signals to the TCP ICs. If thereis a bar defect on the screen, it could be a Control Board problem.

MCM

TCP TCPTCP

16 line

Resistor Array

192 Lines output

Diagram of Control BoardControl Board to X Board

Address Signal Flow

16 line

LGPCMx05W

TroubleshootingX BOARDS

50PC5D




P208 P200

TCP IC’s shown are part of the Ribbon Cable

TCP IC

50PC5D

Center X Board

TCP (Tape Carrier Package) Troubleshooting

50PC5D




TCP IC

Front side

TCP ICs supply RGB 16 bit signal to the PDP by connecting the PAD Elec t rode of the PANEL w i th the X Board .

TCP

Connector

F r am

e X _B / D

F r ont p an

el

R e ar p

an

el

TroubleshootingX BOARDS50PC5D




Output to TCP IC1

Center Top X Board

NC

50

VA (7,8,9) 15 Thru 25

26-29

Grnd

30 Thru 36

45,46

NC

VA (42,43,44)

37 Thru 39Grnd

Connections on Connector P204

RGB Logic Signals RGB Logic Signals

VA

2,3,4Ground

5,6NC

10,11NC

12,13,14Ground

40, 41NC

47,48,49

Ground

R212R211

VA

NC

Typical Reading .65 ( Measured in “Diode” Mode)

X B d V l Di ib i

TroubleshootingX BOARDS 50PC5D




IC201

C200

P208P200

C201C202C203C204

VA 5V GND

D201D202

L201 L202

X Board Voltage DistributionRGB Signals from the Control Board

RGB Address Signals out to TCP IC’s and PDP

P201

R205R206

R207R208

P202 P203 P204 P205 P206 P207

R209R210

R211R212

R213R214

R215R216

R217

R218

TheXBoard receivesa Logic Signalfromthe ControlBoardandcontrols

TroubleshootingX BOARDS 50PC5D




X LEFT B/DX LEFT B/D X RIGHT B/DX RIGHT B/D

TCP Separating

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).

Lift up lock as shown in the Picture. Remove TCP as shown in Picture

TroubleshootingMAIN BOARD 50PC5D




• DC Voltage and Waveform Checks• Resistance Measurements

Operating Voltages SMPS Supplied

This Section of the Presentation will cover troubleshooting the Main Board. Upon completionof this Section the technician will have a better understanding of the operation of the circuitand will be able to locate voltage and resistance test points needed for troubleshooting andalignments.

9V

2.5V

19V12V6V3.4V

Developed on

the Main Board 3.3V (2)5V

MAIN BOARD 50PC5DTroubleshooting

LVDS




Tuner IC1001

A/V Component Inputs

A/V Composite inputs

RS 232HDMI

Cable/ Antenna

SpeakersP7009 P7010

Fan P6007

P6001

PC

P4004 P4005 P4003

USB

Audio OutputIC7017

IC4015Micro Controller

AV2 Input

Keyboard InputP4007

P5002

MAIN BOARD50PC5D

Troubleshooting

P4004 P4005 P4003 P6001




FanP6007

Tuner

IC4003

IC401612V0V9V

0V3.3V

5V

IC4013IC4008

P4007P5002

Input Jacks

IC4008

3.4V Input

3.3V Control

0V

1.1V

2.5V Output

IC4013

6V Input

3.2V Control

5V Output

0V

0V

6.7V.2V0V

AudioOutput

IC7017

IC4011

4.9V 3.3V

LVDS

IC1001

BCM3550

MST3361

IC7004

D4006

P7009

P7010

IC5003CXA2069Q

IC4015MTV416GMF

RF Input

CableANT.

Tuner

Block diagram Analog and Digital Inputs Troubleshooting




MST3361

Side AV V,LR

Rear AV V, LRRear S YC, LR

Side S YC, LRMNT_V_Out

IN1

OUT1IN4IN1

IN4

IN5

OUT3

Comp_1 YCbCr Comp_2 YCbCr

IN3IN4

C V B S

CVBS

ATSC/NTSC Tuner

64-Bit I/F

BCM3550IC1001

12LVDSTrans VDEC_CVBS/S_Y

VSB/QAM/NTSC/SIF

SPDIF Out

R/L Output

SPDIF_OUT

Flash Memory16MByte

HDMI/DVI

RS-232C

SDRAM256Mbit X-tal54MHz

ResetIC

D-class AMP

Sub Micom(MTV416)

Sub Micom(MTV416)

EEPROM

HDMI ComponentRGB-PC

Audio

Comp_1 LRComp_2 LRRGB(Phone) LR AUDIO

ADC

Audio R/L I2SI2S Audio Input

R/G/B

H/V SyncDVI Input

Digital Output.

SDRAM256Mbit x2

DDS

Data [24]

Hsync/Vsync/DE/Clk2X1S/W

2X1S/W

HDCP

IIC

TMDS

DDS

SPDIF

Y,C

IF P/N for DTVSIF for NTSC

SIF for NTSC

USB for upgrade S/W

LRMNT_OutAUDIODAC

IIS

TMDS

CXA2069(AV S/W)

IC6004

IC7004

THC63LVD

IC4015

Video signal path for Composite/S-video/IF

Troubleshooting




MNT_V_Out

SD_CVBSCXA2069

IC5003

OUT3

Side AV V,LR

Rear AV V, LR

Rear S YC, LR

Side S YC, LR

IN1

IN4

IN1

IN4

IN3

IN4

Comp_1 LR

Comp_2 LR

RGB(Phone) LR

BCM3550

SD_Y

SD_C

ANT/ Cable

TV IN

CVBS from TUNER

FMS6400

Y/CVBS

C

OUT1/Y

OUT1/C

M_CVBS/Y

C

M_CVBS

C

Y

LPF forCVBS

SD_CVBS

TUNER

IF_P

IF_N

IF_P from TUNER for DTV

IF_N from TUNER for DTV

Video signal path for HDMI Inputs

IC7004

MST3361

Troubleshooting




IC7004

BCM3550

GPIOGPIO for Interrupt

HD-DVIData [0: 23]

H sync/V sync

/DE/ClockH,V Sync/Clock

GPIO

GPIO for Power detectionGPIO

GPIO for Hot plug detection

IC1001

TMDS1 RX0+/-

TMDS1 RX1+/-TMDS1 RX2+/-TMDS1 RX3+/-

DDC SDA1

DDC SCL1EEPROMFor EDID

DDC SDA1

DDC SCL1

TMDS1INPUT

DDC1INPUT

TMDS2 RX0+/-

TMDS2 RX1+/-TMDS2 RX2+/-TMDS2 RX3+/-

DDC SDA2

DDC SCL2EEPROMFor EDID

DDC SDA2

DDC SCL2

TMDS2INPUT

DDC2INPUT

HDCP SDA

HDCP SCLEEPROMFor HDCP

NDA

NCL

INT

DATA_OUT

H,V Sync/DE /Clock

HDMI 1

HDMI 2

ANT/ Cable

BCM3550

Audio signal path Block Diagram

IF_P from TUNER for DTVIF P

Troubleshooting




SIF from TUNER

CXA2069

Side AV V,LR

Rear AV V, LR

Rear S YC, LR

Side S YC, LR

IN1

IN4

IN1

IN4

IN3

IN4

Comp_1 LR

Comp_2 LR

RGB(Phone) LR

OUT1/R

OUT1/L

TUNER

AUDIO ADC(CS5331)

Audio R I2S_SCK_IN

Audio L

SIF

I2S_LRCH_IN

I2S_LRCK_IN

I2S_SCK_IN

I2S_LRCH_INI2S_LRCK_IN

SPDIF_IN_PSPDIF from MST3361

_RMNT_OutAUDIO DAC

(CS4344)

I2S_SCK_OUT

I2S_LRCH_OUT

I2S_LRCK_OUT

I2S_SCK_OUT

I2S_LRCH_OUT

I2S_LRCK_OUT

_LMNT_Out

Analog L_OUTAudioAMP

(TPA3100)

SPDIF Out SPDIF_OUT_P

AUD_LEFT_P

AUD_LEFT_N

AUD_RIGHT_N

AUD_RIGHT_P

SPK_L_P

SPK_L_N

SPK_R_N

SPK_R_P

Analo g R_OUT

MC3307(OP-AMP)

IF_N from TUNER for DTVIF_PIF_N

MAIN BOARD50PC5D

Troubleshooting

Voltage and Resistance Measurements for the Main Board




Standby Run ResistanceConnector Pin Number 123456789

101112

28K22KGND5.8K10K27K22KGND10K

6.4MEGGND

P4004 100K

28K

NC

4.1V3.6V5.1VGND3.7V4.9V3.7VNC

NCNCNCNC

4.1V0V

5.1VGND

0V0V0VNCNCNCNCNCNC13

Voltage Measurements using the 6709V00001A Power Supply. Resistance Readings with the PCB Disconnected

P4005 12345678

91011

0V0V0V0V0V0V

0V

0V0V0V

0V

3.4V3.4V0V0V

5.9V5.9V

0V

11.9V

0V

11.9V0V0V0V12

4.6K4.6KGNDGND

6.4MEG6.4MEG

GNDGND

GNDGND

22K22K

MAIN BOARD50PC5D

Troubleshooting





Standby Run ResistanceConnector Pin Number P4003 1

23456789

10

0V0V0V0V0V0V

0V0V0V

0V

19V19V0V0V

GND5.9V

3.4V

11.9V0V

0V

6MEG6MEGGNDGND

∞GND4.6KGND

∞GND


P6007 123

0V0V0V

6.7.20V 10KGND

1.5K

P7009 123

0V0V0V

9.6V9.6V9.6V

7.7MEG7.7MEG

7.7MEG

4 0V 9.6V

R SPEAKER

7.7MEG

FAN

P7010 123

0V0V0V

9.6V9.6V9.6V

7.7MEG7.7MEG7.7MEGL SPEAKER

MAIN BOARD50PC5D

Troubleshooting





Voltage and Resistance Measurements for the Main BoardStandby Run ResistanceConnector Pin Number

P4007 123456789

10

2.5V0V0V0V0V4V

3.3V0V

3.3V

0V

0V2.6V0V

4.9V

4V0V

0V

0V3.3V

3.3V

10K10KGND23KGND

GND18K

GND10K

10K

P5002 12

34567891011

0V0V

0V0V0V0V

0V0V0V0V

0V

0V0V0V0V

0V1.4V

0V

0V0V

0V0V0V0V12

76 ΩGND

GND11.7K53.8K

GND

480K

GND

475KGND

76 Ω

76 Ω

MAIN BOARD50PC5D

Troubleshooting






123456789

101112

28K22KGND5.8K10K27K22KGND10K

6.4MEGGND

P4004 100K

28K

0V

5.1V4.6V5.1VGND4.7V4.9V4.9V5V

3.3V6V0V

4.7V

5.1V0V

5.1VGND

0V0V0V

5.1V0V3.3V0V0V0V13

Voltage Measurements using the EAY32957901 Power Supply. Resistance Readings with the PCB Disconnected

P4005 123456789

1011

0V0V0V0V0V0V

0V0V0V0V

0V

3.4V3.4V0V0V

5.9V5.9V

0V

11.9V0V

11.9V0V0V0V12

4.6K4.6KGNDGND

6.4MEG6.4MEG

GNDGND

GNDGND

22K22K

MAIN BOARD50PC5D

Troubleshooting






P4003 123456789

10

0V0V0V0V0V0V

0V0V0V

0V

19V19V0V0V

GND5.9V

3.4V

11.9V0V

0V

6MEG6MEGGNDGND

∞GND4.6KGND

∞GND


P6007 1

23

0V

0V0V

6.7

.20V 10KGND

1.5K

P7009 123

0V0V0V

9.6V9.6V9.6V

7.7MEG7.7MEG

7.7MEG

4 0V 9.6V

R SPEAKER

7.7MEG

FAN

P7010 123

0V0V0V

9.6V9.6V9.6V 7.7MEG7.7MEG

7.7MEGL SPEAKER

MAIN BOARD50PC5D

Troubleshooting







P4007 123456789

10

2.5V0V0V0V0V4V

3.3V0V

3.3V

0V

0V2.6V0V

4.9V

4V0V

0V

0V3.3V

3.3V

10K10KGND23KGND

GND18K

GND10K

10K

P5002 123456789

1011

0V0V0V0V0V0V

0V0V

0V0V

0V

0V0V0V0V

0V1.4V

0V

0V0V

0V0V0V0V12

76 ΩGND

GND11.7K53.8K

GND

480KGND

475K

GND

76 Ω

76 Ω

“No raster” in detailsN o P i c t u r e ( So u n d O k ) L o o k f o r R e se t

50PC5DSummary




(1) Check and see if LED’s are lit on the CTRL B/D. Missing check for 5VDC No Reset Occurs and no waveformspresent to drive the display panel! Check POD going high on the SMPS Board.

(5) Check LVDS cable from Main to CTRL B/D, Short Pin 1 to Pin 2 of Connector P7 CTRL B/DTest Patterns Reset Occurs

(2) Check for VS, VA from SMPS. Missing check Resistances, look for possible shorts on the Y and Z SUS Boards.

Check VS ON, going high on the SMPS Board from the Main Board. No Reset Occurs.

(3) Check Waveforms at B9 Y SUS, and R7 Z SUS, if missing or distorted check on the Power Supply for VS,Y SUS BD for VSC,V Set Down, V SET UP, Z SUS BD Z Bias, 18V IPM’s Both Y&Z Boards No Reset

(6) Check VA to the X Boards Reset Occurs

(4) Examine Scan IC’s on Y Drive Boards use Diode Check No Reset

50PC5D

Troubleshooting




The End

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