Panasonic TH-42PX75U Technical Manual

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Service manual (130 pages)

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Page 1 Technical Guide Technical Guide Plasma Plasma (GPH10DU Chassis) (GPH10DU Chassis) Troubleshooting Handbook Troubleshooting Handbook Model : TH 42PX75U Model : TH 42PX75U 50PX75U 50PX75U 42PX77U 42PX77U 50PX77U 50PX77U Panasonic Services Company National Training...
Page 2 Prepared by Panasonic Service and Technology Company National Training Copyright © 2007 by Panasonic Services Company All rights reserved. Unauthorized copying and distribution is a violation of law. Warning This service information is designed for experienced repair technicians only and is not designed for use by the general public.
Page 3: Table Of Contents
Table of Contents Subject Page Subject Page Troubleshooting Shutdown Problems No Picture\No OSD Power LED’s Response to Shutdown Operation No Sound (TH-42PX600U) LED blinks 1 time Troubleshooting for Picture Problems LED blinks 2 times Diagnostic Method for Troubleshooting PDP Television LED blinks 3 times Diagnosis by Test Pattern When OSD is Available LED blinks 4 times...
Page 4 Introduction <Introduction> 1. Basic concept of how to determine the defective board 1) Verification of voltages Normally, when there is a power problem, shutdown occurs immediately. So, to resolve a power problem, voltage checks are necessary before shutdown. 2) Check if the power comes up after disconnecting the suspected board. If power comes up (*) after disconnecting a board, the board is defective.
Page 5: Troubleshooting Shutdown Problems
Troubleshooting Shutdown Problems...
Page 6: Power Led's Response To Shutdown Operation
Power LED’s Response to Shutdown Operation <LED Blinking timing> 3.0sec (interval) Light <Check point> No Light Blinking Contents Check Point times STB5V sense time out A Board 15V line abnormality D Board (15V SOS) 3.3V line abnormality D Board (3.3V SOS) Power Supply abnormality P Board (Power SOS) 5V line abnormality...
Page 7: Led Blinks 1 Time
LED blinks 1 time <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. Communication Error A Board A5, A6, and A7 <How to find the defective boards> location The A board is defective. To confirm this, unplug the TV and disconnect connectors A5, A6, and...
Page 8: Led Blinks 2 Times
(*1) = The reference number of the sustain data connector is <How to find the defective boards> different in some of the models: TH-42PX75U = SS23 Disconnect CN A5, A6, TH-42PX77U = SS23 and A7 on the A board. Does...
Page 9: Led Blinks 3 Times
LED blinks 3 times <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. 3.3V down SOS D Board <How to find the defective boards> The D board is defective. Note: CN = Connector...
Page 10: Led Blinks 4 Times
LED blinks 4 times <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. Power Supply SOS Primarily P board or possible D board <How to find the defective boards> Turn the unit on.
Page 11: Led Blinks 5 Times (Quick Troubleshooting)
LED blinks 5 times (Quick Troubleshooting) <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. 5V SOS D, P, C, SC, SS board or Panel (DDIC)*1 (*1) = Data Driver IC <How to find the defective boards>...
Page 12: Led Blinks 5 Times
<How to find the defective boards> different in some of the models: Connect Disconnect CN SC20. Disconnect TH-42PX75U = SS23 CN SC20 on the SC board. Turn CN SS23 (*1) on the SS board. on the unit. Does the power LED TH-42PX77U = SS23 Turn on the unit.
Page 13: Led Blinks 6 Times
Label) P Board CAUTION: Before connecting P2 or P11, discharge is necessary to TH-42PX75U = SS23 prevent potential shock caused by VSUS. TH-42PX77U = SS23 (*2) Place a jumper across pin 8 and 10 of connector P12. The unit will TH-50PX75U = SS33 not enter the standby mode without the jumper.
Page 14 LED blinks 6 times <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board (Possibility) making any disconnection or connection. SC Energy Recovery SOS SC, SS, D, P Board (SC > SS, D, P ) Figure 2 Figure 1...
Page 15: Led Blinks 7 Times
LED blinks 7 times <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to making any disconnection or Trouble Mode Defective Board (possibility) connection. SC Floating voltage SOS SC, SU, SD, P board (SC,SU,SD>D,P) <How to find the defective boards> Make sure the connectors P2/SC2, SC20/D20 are not loose and seated properly.
Page 16: Led Blinks 8 Times
SC board. models: CN P12 (*1) from the P pin 1 of CN P11 present Turn the TV on. Does TH-42PX75U = SS23 board. Turn the TV on. before Shutdown? the TV power up and Does the TV power up...
Page 17: Led Blinks 9 Times
LED blinks 9 times <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. Panel Status D Board <How to find the defective boards> In this case, only the D board is defective.
Page 18: Led Blinks 10 Times Before Pressing The Power Button
LED blinks 10 times before pressing the power button <Trouble Mode and Defective Board> Warning: Disconnect AC Power prior to Trouble Mode Defective Board making any disconnection or connection. SUB 5V SOS, Main 3.3V SOS P, A Board DTV 9V SOS, Tuner Power SOS <How to find the defective board(s)>...
Page 19: Led Blinks 10 Times After Pressing The Power Button
LED is off? TH-42PX75U = SS23 TH-42PX77U = SS23 Unplug the TV and connect CN A5, TH-50PX75U = SS33 CN A6, and CN A7. Disconnect CN TH-50PX77U = SS33 SC2(*1), and SC20 of the SC board.
Page 20: Led Blinks 12 Times
Sound SOS Speakers, A Board data connector is different in some of the models: <How to find the defective boards> TH-42PX75U = SS23 TH-42PX77U = SS23 Warning: Disconnect AC Power TH-50PX75U = SS33 Disconnect the connectors A5, A6, prior to making any disconnection TH-50PX77U = SS33 and A7 on the P board.
Page 21: Dead Part I
Troubleshooting (No Power/Dead Unit) Part 1 Do the AC relays click after the TV is plugged Is there 5V at into the AC line? pin 5 of connector A7 when the TV is plugged into the AC line? Is there 2.5V at pin 20 of connector D5 when the power button is pressed?
Page 22 Troubleshooting (No Power/Dead Unit) Part 2 Continue from Previous slide there 3.3V at pin 6 of connector P7 when the TV is plugged into the AC line? Replace The P board Disconnect connector A1. Do the AC relays click after the TV is plugged into the AC line? If cable between connectors K1 and A1 is OK,...
Page 23: No Picture From One Or All Inputs (Osd And Sound Ok)
No Picture from one or all inputs (OSD and Sound OK) <Symptom> Warning: Disconnect AC Power prior to No Picture from one or all inputs (Sound OK) making any disconnection or <Models> connection. All models <How to determine the defective board> Is there no picture from all A Board...
Page 24: No Picture\No Osd
No Picture / No OSD <Symptom> Warning: Disconnect AC Power prior to No Picture at all making any disconnection or <Models> connection. All Models) <How to determine the defective board> Is the On Screen Display information visible? Unplug the unit from the wall outlet. Disconnect the connector A5 from the A board.
Page 25: No Sound (Th-42Px600U)
No Sound <Symptom> Warning: Disconnect AC Power prior to No Audio making any disconnection or connection. <How to determine the defective board> Is there 15V at Is there a sound pin 1 of CN A6 on waveform at pin 1 A board the A board? and 4 of CN A12 on...
Page 27: Troubleshooting For Picture Problems
Troubleshooting for Picture Problems...
Page 28: Diagnostic Method For Troubleshooting Pdp Television
Diagnostic Method for Troubleshooting PDP Television <Introduction> 1. There are two kinds of picture problem 1) Abnormal picture 2) No picture 2. Basic concept of determining the defective board 1) Which area is the symptom displayed on the screen? A. Part of the screen B.
Page 29: Diagnosis By Test Pattern When Osd Is Available
Diagnosis by Test Pattern When OSD is Available <Purpose> Picture problem such as “Picture Noise and or Vertical Line” displayed all over the screen is mainly caused by a defective D or A board. The “internal Test Pattern Generator” can help determine whether to replace the D or A board.
Page 30: Diagnosis By Removing The D5 Connector
Diagnosis by Removing the A5 Connector <Purpose> Symptom such as “No picture, No OSD, Sound OK” is mainly caused by a defective A or D board. The internal pattern generator cannot be accessed due to the loss of OSD. This method makes it possible to determine whether the A board or the D (SC,SS) is defective.
Page 31: Troubleshooting For Picture Trouble
Troubleshooting for Picture Trouble <How to determine the defective board> Start Some part of the screen Upper half Where is the symptom SU Board (or D, or SC) displayed? *Note :Panel gas leakage Lower half Upper or Lower half (from front view) SD Board (or D, or SC) Both area SS Board (or D)
Page 32: Diagnosis For Picture Problem (All Over The Screen) 32~35
<Symptom> <Model> Abnormal Color, Vertical Line, Sync Error, Noise Picture All Models <Sample Picture> <Possible Cause> A Board, D Board, SC Board, SU Board, SD Board <Block Diagram> e.g. TH-42PX75U <Back side view> IC1100 IC9500 IC9900 MICRO PICTURE PLASMA AI...
Page 33 Diagnosis for Picture Problem (All Over the Screen) <Diagnosis (1)> Enter the “Internal Test Pattern Generator” Is the screen “White”, after disconnecting the connector “A5”? <Result> <Result> displayed not displayed Test Pattern or White Picture Test Pattern or White Picture <Cause>...
Page 34 Diagnosis for Picture Problem (All Over the Screen) <Diagnosis (2)> Sample of NG Waveform Confirm the waveform at “TPSC1” of the SC board <Result> <Result> Correct Waveform Waveform Waveform Here <Cause> <Cause> Board defect SC,SU,SD Board defect Refer to “Diagnosis (3)” on next page TPSC1 <Back side view>...
Page 35 Diagnosis for Picture Problem (All Over the Screen) <Diagnosis (3)> Confirm the waveform at “TPSC1” after removing the SU or SD Board from the SC Board <Result> Situation Condition Condition 2 Cause Bottom half of SU Board Disconnect Board Waveform (Connect SD) Picture OK? SD Board...
Page 36: Diagnosis Of Vertical Line Problem
Diagnosis of Vertical Line Problem NG Area (Front view) case1 case2 Panel Thin vertical line A number of blocks not lighting or 1 block not lighting case1 case2 PDP panel (Driver IC) NG D board (or C board) NG ( or D board, or C board ) 1 Line 1 Block 2 Blocks...
Page 37: Picture Trouble At Upper Or Lower Half
Picture Trouble at Upper or Lower half <Symptom> <Actual Symptom> No Picture, Picture noise, Full Horizontal line, etc. Symptom : Horizontal line (Lower side) Result : SD board <Models> 50inch (HD Panel), 42 inch (HD/SD Panel) <NG Area> (Front view) Symptom : Horizontal line (Upper side) Result...
Page 38: Picture Trouble At Right Or Left Half (50 Inch)
Picture Trouble at Right or Left half (50 Inch) <Symptom> <Symptom> <Actual Symptom> No Picture, Picture noise, etc. Symptom : Cyan noise (Right side) Result : D board <Models> 50inch (HD Panel) <NG Area> (Front view) <Defective board> Trouble at Right half : D-board defect Trouble at Left half :...
Page 39: Picture Trouble At Right Or Left Half (42/37 Inch)
Picture Trouble at Right or Left half (42 Inch) <Symptom> <Symptom> <Actual Symptom> No Picture, Picture noise, Full Vertical line, etc. Symptom : Vertical line Result : Panel <Models> 42 inch (HD Panel) <NG Area> (Front view) <Defective board> Trouble at Right half : D or C1 board (Panel) defect Trouble at Left half :...
Page 40: Picture Trouble In 50 Inch Models
Picture Trouble in 50 Inch Models <Symptom> <Symptom> No Picture, Picture noise, Half Vertical line, etc. <Models> 50inch (HD Panel) <NG Area> (Front view) <Defective board> 1 Trouble at Upper right : C1 board or Panel defect 2 Trouble at Upper middle : C2 board or Panel defect Trouble at Upper left :...
Page 41: Picture Trouble All Over The Screen
Picture Trouble all Over the Screen <Symptom> <Symptom> <Actual Symptom> Picture noise, Full Vertical line, etc. Symptom : Vertical line (All over screen) Result : D board <Models> 42inch (HD Panel) <NG Area > (e.g. 42 inch Panel) (Front view) Symptom : White balance NG Result...
Page 42: Examples Of Symptoms And Remedies
Examples of Symptoms and Remedies...
Page 43 Picture Problem (All over the screen) <Symptom> Noise Picture <Photo of Symptom> Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel)
Page 44 Picture Problem (All over the screen) <Symptom> Vertical Line <Photo of Symptom> Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel)
Page 45 Picture Problem (All over the screen) <Symptom> Abnormal Color, White Balance NG <Photo of Symptom> Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Yellow Magenta...
Page 46 Picture Problem (All over the screen) <Symptom> Sync Error <Photo of Symptom> Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel)
Page 47 Picture Problem (Right half or Left half) <Symptom> Vertical Line <Photo of Symptom> Model : 50 (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel)
Page 48 Picture Problem (Upper or Bottom) <Symptom> Vertical Line <Photo of Symptom> Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel) Result : D Board Result : D Board Result : D Board Model : 42 inch (HD panel) Model : 42 inch (HD panel) Model : 42 inch (HD panel)
Page 49: Reset And Self-Check Procedure
Self-check Procedure NOTE: This procedure does CHASSIS: GPH10D All models not reset the TV Self-check Screen How to access the self-check screen to reset the unit. Select a television channel, and while pressing the [VOLUME ( - )] button on the main unit, press the [OK] button on the remote control for more than 3 seconds.
Page 50 Reset Procedure CHASSIS: GPH10D All models To Reset the Unit, turn the TV on and while pressing the “VOLUME ( - )” button on the main unit, press the “Menu” button on the remote control for more than 3 seconds. The Self-Check menu appears on screen.
Page 51: Driver Setup Adjustment 51~52
TH-42PX75U/ TH-42PX77U Driver Setup Adjustment Driver Setup Table Item / Preparation Input a white signal to plasma video input. Set the picture controls as follows. Picture menu: Vivid Normal: Set Aspect: Full Caution First perform Vsus adjustment. Confirm the voltage level of VSCN. This should be done after the adjustment of Vad which should be - 105V When Vad = -105V, Vscn voltage is 40V ±4V.
Page 52 TH-50PX75U/ TH-50PX77U Driver Setup Adjustment Driver Setup Table Item / Preparation Input a white signal to plasma video input. Set the picture controls as follows. Picture menu: Vivid Normal: Set Aspect: Full Caution First perform Vsus adjustment. Confirm the voltage level of VSCN. This should be done after the adjustment of Vad which should be - 105V When Vad = -105V, Vscn voltage is 40V ±4V.
Page 53: Board Layout And Part Numbers 53~56
TH-42PX75U BOARD LAYOUT AND PART NUMBERS TH-42PX75U BOARD LAYOUT BOARD NAME PART NUMBER DESCRIPTION DC-DC Converter Speaker out, Sound Processor TNPH0692ABS AV Terminal, AV Switch Digital Signal Processor, Microcomputer HDMI Interface, Peaks Lite 2 TXNC11HNTU Data Driver (Lower Right) TXNC21HNTU...
Page 54 TH-50PX75U BOARD LAYOUT AND PART NUMBERS TH-50PX75U BOARD LAYOUT BOARD NAME PART NUMBER DESCRIPTION DC-DC Converter Speaker out, Sound Processor TNPH0692ACS AV Terminal, AV Switch Digital Signal Processor, Microcomputer HDMI Interface, Peaks Lite 2 TXNC11HMTU Data Driver (Lower Right) TXNC21HMTU Data Driver (Lower Center) TXNC31HMTU Data Driver (Lower Left)
Page 55 TH-42PX77U BOARD LAYOUT AND PART NUMBERS TH-50PX77U BOARD LAYOUT BOARD NAME PART NUMBER DESCRIPTION DC-DC Converter Speaker out, Sound Processor TNPH0692AES AV Terminal, AV Switch Digital Signal Processor, Microcomputer HDMI Interface, Peaks Lite 2 TXNC11HNTU Data Driver (Lower Right) TXNC21HNTU Data Driver (Lower Left) TZTNP01LPTU Format Converter, Plasma AI, Sub-Field Processor...
Page 56 TH-50PX77U BOARD LAYOUT AND PART NUMBERS TH-50PX77U BOARD LAYOUT BOARD NAME PART NUMBER DESCRIPTION DC-DC Converter Speaker out, Sound Processor TNPH0692AFS AV Terminal, AV Switch Digital Signal Processor, Microcomputer HDMI Interface, Peaks Lite 2 TXNC11HMTU Data Driver (Lower Right) TXNC21HMTU Data Driver (Lower Center) TXNC31HMTU Data Driver (Lower Left)

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