Panasonic Viera TH-42PX75U Technical Manual Download Page 44

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<Symptom>

Vertical Line

<Photo of Symptom>

Picture Problem (All over the screen)

Model

: 42 inch (HD panel)

Result

: D Board

Model

: 42 inch (HD panel)

Result

: D Board

Model

: 42 inch (HD panel)

Result

: D Board

Model

: 42 inch (HD panel)

Result

: D Board

Model

: 42 inch (HD panel)

Result

: A Board

Model

: 42 inch (HD panel)

Result

: A Board

Model

: 42 inch (HD panel)

Result

: SC Board

Model

: 42 inch (HD panel)

Result

: SD Board

Model

: 42 inch (HD panel)

Result

: SD Board

Summary of Contents for Viera TH-42PX75U

Page 1: ...TH 50PX75U 50PX75U TH TH 42PX77U 42PX77U TH TH 50PX77U 50PX77U Technical Guide Technical Guide Plasma Plasma GPH10DU Chassis GPH10DU Chassis Troubleshooting Handbook Troubleshooting Handbook Panasoni...

Page 2: ...ir technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a produ...

Page 3: ...le in 50 Inch Models 40 Picture Trouble all Over the Screen 41 Examples of Symptoms and Remedies 42 48 Reset and Self check Procedure 49 Driver Setup Adjustment 51 52 Board Layout and Part Numbers 53...

Page 4: ...ary 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 Power comes up equals no shutdown 2 Troub...

Page 5: ...Troubleshooting Shutdown Problems 5...

Page 6: ...Driver abnormality STB5V sense time out Panel Status abnormality Scan Driver 2 abnormality Voltage for sound abnormality REG voltage abnormality D Board 15V SOS D Board 3 3V SOS P Board Power SOS D Bo...

Page 7: ...ind the defective boards The A board is defective To confirm this unplug the TV and disconnect connectors A5 A6 and A7 from the A board The TV should turn on automatically and display a white screen W...

Page 8: ...8 and 10 of connector P12 SS Board No Turn the unit on Does the power LED stay on Yes Warning Disconnect AC Power prior to making any disconnection or connection 8 1 The reference number of the susta...

Page 9: ...ode and Defective Board Trouble Mode 3 3V down SOS Defective Board D Board How to find the defective boards The D board is defective Warning Disconnect AC Power prior to making any disconnection or co...

Page 10: ...Defective Board Primarily P board or possible D board How to find the defective boards D Board Turn the unit on Is pin 12 of CN P25 of the P board high before shutdown P Board Yes No Warning Disconne...

Page 11: ...find the defective boards Is there a short to ground Disconnect CN P12 of the power supply board Measure the resistance of pin 1 of the lead cable to ground Yes Warning Disconnect AC Power prior to ma...

Page 12: ...in 5 CN P25 shorted to GND Yes No Disconnect CB5 CB8 Is pin 5 of CN P25 shorted to GND Yes No C2 Board Panel Connect CN SC20 Disconnect CN SS23 1 on the SS board Turn on the unit Does the power LED St...

Page 13: ...to making any disconnection or connection Disconnect connectors SC2 and SC20 from the SC board Turn the TV on Does the TV power up and stay on SS Board Yes Connect SC2 and SC20 Disconnect CN P12 2 fro...

Page 14: ...Trouble Mode and Defective Board Trouble Mode SC Energy Recovery SOS Defective Board Possibility SC SS D P Board SC SS D P Warning Disconnect AC Power prior to making any disconnection or connection 1...

Page 15: ...ct the connectors SC2 2 and SC20 to the SC board Remove the SU board Turn the TV on Does the TV power up and stay on SU Board Yes No Yes No Yes No Yes No Make sure the connectors P2 SC2 SC20 D20 are n...

Page 16: ...ing the SS board change the D board SC Board P Board Turn the TV on Is the VSUS 3 input at pin 1 of CN P11 present before Shutdown No No Yes No D Board SS Board 4 Yes Warning Disconnect AC Power prior...

Page 17: ...ode and Defective Board Trouble Mode Panel Status Defective Board D Board How to find the defective boards In this case only the D board is defective Warning Disconnect AC Power prior to making any di...

Page 18: ...efective Board P A Board How to find the defective board s Disconnect connectors A5 A6 and A7 on the A board and plug the TV into the AC line Does the TV turn on by itself with a white screen and the...

Page 19: ...t CN SC2 1 and SC20 of the SC board Plug the unit in Does the power LED stay on when the TV is turned on Yes SC Board No Unplug the TV and re connect CN SC2 1 and SC20 of the SC board Disconnect CN SS...

Page 20: ...Does the power LED stay on SS Board No Do pins 1 and 2 of CN P25 output 15V before the unit shuts down P Board No D Board Yes Warning Disconnect AC Power prior to making any disconnection or connectio...

Page 21: ...e TV is plugged into the AC line Unplug the TV Disconnect connector A7 Does the TV turn on by itself when it is plugged into the AC line with no picture and lit LEDs on SS SC boards Check connections...

Page 22: ...e AC relays click after the TV is plugged into the AC line If cable between connectors K1 and A1 is OK Replace the K board Continue from Previous slide NO NO NO Yes Yes Yes Replace The P board Disconn...

Page 23: ...nnect CN A5 Turn the unit on Does a white picture appears No Yes D Board Panel discharge occurs No Yes SU Board Disconnect the SU Board from the SC board Turn the unit on Is there a picture at the low...

Page 24: ...ed No Yes SC Board SS Board D Board Is there 75V VDA at pins 1 and 2 of the connector SS12 P Board Is the screen completely white Yes A 1 or D 2 Board No A Board 1 Unplug the unit from the wall outlet...

Page 25: ...f CN A12 on the A board No Yes Check the speakers Make sure A12 is properly seated No Warning Disconnect AC Power prior to making any disconnection or connection 25 A board Is there 15V at pin 1 of CN...

Page 26: ...26...

Page 27: ...Troubleshooting for Picture Problems 27...

Page 28: ...e 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 All over the screen 3 Adjustment after PCB exchange 1 After...

Page 29: ...n 1 While pressing VOLUME button of the TV set press RECALL button of the remote control three times within 3 seconds 2 Push button 1 of the Remote Control several times to select the AGING setting 3...

Page 30: ...ble to determine whether the A board or the D SC SS is defective Block Diagram and Explanation 1 This white pattern is generated by IC9900 on D board 2 When the TV is plugged in after disconnecting co...

Page 31: ...ymptom No picture with buzz noise How to determine the defective board Start Upper or Lower half from front view Upper half Lower half Both area SU Board or D or SC SD Board or D or SC SS Board or D R...

Page 32: ...Possible Cause Back side view IC9900 DATA DRIVER IC9500 D LVDS A MICRO PROCESSOR IC4510 Peaks Lite IC1100 HDMI I F PICTURE OUTPUT IC8001 S F PROCESSOR PLASMA AI DISCHARGE CONTROL LVDS RECEIVER D 5 A5...

Page 33: ...RGE CONTROL LVDS RECEIVER D5 A5 Sustain Control Pulse Scan Control Pulse Test Pattern White Picture A and possibly D Board defect Test Pattern OK or White Picture displayed D SC SU SD Board defect Tes...

Page 34: ...view SU SD SC SS Buffer IC Buffer IC Sustain Control Pulse Scan Control Pulse D Board defect Waveform OK SC SU SD Board defect Waveform NG Up to SC Board Refer to Diagnosis 3 on next page Result Caus...

Page 35: ...oard Situation Disconnect SU Board Connect SD Condition Waveform OK Cause SU Board Disconnect SD Board Connect SU Waveform OK SD Board Disconnect the SU and SD Boards Waveform OK SC Board Back side vi...

Page 36: ...board or C board NG D board or C board FPC 1 Line FPC Buffer C Board Buffer C Board Driver IC 1 Block 2 Blocks PDP panel Driver IC NG or D board or C board Driver IC Driver IC Driver IC PDP Panel PDP...

Page 37: ...Upper half SU board SC or D defect NG Area No Picture Picture noise Full Horizontal line etc Actual Symptom Full Horizontal line at both area SS board D defect Symptom Result Symptom Result Symptom R...

Page 38: ...re Picture noise etc Trouble at Left half D board defect 1 2 Trouble at Right half D board defect Symptom Result Cyan noise Right side D board Actual Symptom Symptom Defective board NG Area Models 50i...

Page 39: ...noise Full Vertical line etc Front view SC SU SD SS C1 C2 D 1 2 Trouble at Left half D or C2 board Panel defect 1 2 Trouble at Right half D or C1 board Panel defect Symptom Result Vertical line Panel...

Page 40: ...ertical line etc Symptom NG Area Models 50inch HD Panel 1 Trouble at Upper right 2 Trouble at Upper middle C1 board or Panel defect 3 C2 board or Panel defect C3 board or Panel defect SC SU SD SS C1 C...

Page 41: ...or A or SC board SU SD defect Symptom Result Symptom Result Symptom Result Vertical line All over screen D board White balance NG D board Abnormal Picture SC board A SC Actual Symptom Picture noise F...

Page 42: ...Examples of Symptoms and Remedies 42...

Page 43: ...Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result A Board Model 42 inch HD panel Result SC Board Model 42 inch HD panel Result SC Board Model 4...

Page 44: ...d Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result A Board Model 42 inch HD panel Result A Board Model 42...

Page 45: ...D panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42inch HD panel Result A Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Res...

Page 46: ...panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Resu...

Page 47: ...panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Res...

Page 48: ...nel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Result SU Board Model 42 inch HD panel Result D Board Model 42 inch HD panel Resul...

Page 49: ...from the wall outlet Self check Screen CHASSIS GPH10D All models TV volume down OK on remote only does a basic IC self check It does NOT Reset the TV It does not clear channel programmed settings pict...

Page 50: ...ed parameters will be erased 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 m...

Page 51: ...ne after the adjustment of Vad which should be 105V When Vad 105V Vscn voltage is 40V 4V Note See the panel label for voltages that are not listed in the service manual Adjustment Voltage Panel Label...

Page 52: ...ne after the adjustment of Vad which should be 105V When Vad 105V Vscn voltage is 40V 4V Note See the panel label for voltages that are not listed in the service manual Adjustment Voltage Panel Label...

Page 53: ...2 C1 TXNC11HNTU Data Driver Lower Right C2 TXNC21HNTU Data Driver Lower Left D TZTNP01LPTU Format Converter Plasma AI Sub Field Processor P TXN P1HNTUS Power Supply SC TXNSC1HNTU Scan Drive SD TXNSD1H...

Page 54: ...TU Data Driver Lower Center C3 TXNC31HMTU Data Driver Lower Left D TZTNP01LNTU Format Converter Plasma AI Sub Field Processor P ETXMM655MEHS Power Supply SC TXNSC1HMTU Scan Drive SD TXNSD1HMTU Scan ou...

Page 55: ...XNC11HNTU Data Driver Lower Right C2 TXNC21HNTU Data Driver Lower Left D TZTNP01LPTU Format Converter Plasma AI Sub Field Processor P TXN P1HNTUS Power Supply SC TXNSC1HNTU Scan Drive SD TXNSD1HNTU Sc...

Page 56: ...r Center C3 TXNC31HMTU Data Driver Lower Left D TZTNP01LNTU Format Converter Plasma AI Sub Field Processor P ETXMM655MEHS Power Supply SC TXNSC1HMTU Scan Drive SD TXNSD1HMTU Scan out Lower SS TXNSS1HM...

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