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Panasonic TH-42PX80U, Technical Manual, Page: 23 / 53

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Panasonic TH-42PX80U Technical Manual Download Page 23

LED blinks 12 times

Trouble Mode

Sound SOS

Defective Board (Possibility)

Speakers, A Board

Disconnect the Left and Right 
speakers connectors. Plug in the TV 
and turn it on

Warning: 

Disconnect AC Power 

prior to making any disconnection 

or connection.

No

Yes

Replace

The A board

Does the power 

LED stay on 

when the TV is 

turned on?

Check the speakers and

the speaker’s wires.

If the speakers and the wires

are ok, check P15V (Pin 1 of P25) 

and follow 2 blinks instructions

23

Summary of Contents for TH-42PX80U

Page 1: ...0U TH TH 50PX80U 50PX80U Technical Guide Technical Guide Plasma Plasma GPH11DU Chassis GPH11DU Chassis HD Models HD Models Troubleshooting Handbook Troubleshooting Handbook Panasonic Technology and Se...

Page 2: ...This page is purposely left blank 2...

Page 3: ...n 42 Examples of Symptoms and Remedies 44 49 Self check Procedure 50 Reset 51 Driver Setup Adjustment 52 53 Subject Page Connector s Location TH 42PX80U 5 Power LED s Response to Shutdown Operation 7...

Page 4: ...before shutdown 2 Check if the power comes up after disconnecting the board under suspicion If power comes up after disconnecting a board the board is defective Power comes up equals no shutdown 2 Tr...

Page 5: ...5 Connector s Location TH 42PX80U...

Page 6: ...ubleshooting Shutdown Problems 6 CAUTION Some steps requires removal of connectors and sometimes PC boards removal Do not let the TV run for more than 30 seconds while connectors or boards are disconn...

Page 7: ...5V sense time out Panel Status abnormality Scan Driver 2 abnormality Voltage for sound abnormality REG voltage abnormality A Board 15V SOS A Board 3 3V SOS P Board Power SOS A Board 5V SOS SC SU SD Bo...

Page 8: ...Defective Board A GS Disconnect GS52 on the SD Card Slot Board GS board See Figure 1 Plug in the TV and turn it on Warning Disconnect AC Power prior to making any disconnection or connection Replace...

Page 9: ...1 SS11 discharge is necessary to prevent potential shock caused by VSUS Unplug the TV Re connect CN P12 SS11 SS34 and SS23 1 Turn the TV on Is there 15V output at CN P25 pin 1 or 2 before the TV shuts...

Page 10: ...Mode and Defective Board Trouble Mode 3 3V down SOS Defective Board A Board How to find the defective boards Replace the A board Warning Disconnect AC Power prior to making any disconnection or conne...

Page 11: ...OS Defective Board Primarily P board or possible A board How to find the defective boards Yes No Warning Disconnect AC Power prior to making any disconnection or connection 11 Note CN Connector A Boar...

Page 12: ...lead cable to ground Yes 12 Proceed to more extensive troubleshooting of the slides that follow No Note CN Connector Warning Disconnect AC Power prior to making any disconnection or connection 1 The r...

Page 13: ...in the TV and turn it on Connect SS23 1 Disconnect CN 31and A32 on the A board With the TV disconnected measure continuity between pin 5 of CN P25 and GND Is pin 5 of CN P25 shorted to GND Connect A31...

Page 14: ...lug in the TV and turn it on Warning Disconnect AC Power prior to making any disconnection or connection 1 The reference number of the sustain data connector is different in some of the models TH 42PX...

Page 15: ...floating ground screws on the SU board which are located above and below connector SU41 see figure 2 Caution Before turning the unit on confirm that the jumper is not connected to a chassis ground scr...

Page 16: ...nnectors SC2 and SC20 from the SC board Plug in the TV and turn it on Disconnect the SD board and reconnect the SU board See instructions on slide 15 Plug in the TV and turn it on Does the TV shut dow...

Page 17: ...Panel Defective Board possibility SS A board SS A PDP P Board No No Yes 17 Panel Yes No Disconnect CN SS23 from the SS board Plug in the TV and turn it on Does the TV power up and stay on Is the anode...

Page 18: ...s Trouble Mode and Defective Board Trouble Mode Panel Status Defective Board D Board How to find the defective boards Replace the A board Warning Disconnect AC Power prior to making any disconnection...

Page 19: ...rd Do the AC relays click after the TV is plugged into the AC line Replace The A board If cable between connectors GS52 and A51 is OK Replace the GS board 19 Trouble Mode Dead No power Defective Board...

Page 20: ...till blink 10 times Replace the K board No No Yes Yes Does the TV shut down Replace The A board Replace the GS board Replace The A board NOTE When taking voltage reading place your meter s probe on th...

Page 21: ...in 8 and 10 of CN P12 Plug in the TV and turn it on Yes No Note CN Connector Go to the Next slide B Go to the Next slide A Replace The SS board Replace The SC board Warning Disconnect AC Power prior t...

Page 22: ...any of these voltages missing Warning Disconnect AC Power prior to making any disconnection or connection 1 The reference number of the sustain data connector is different in some of the models TH 42P...

Page 23: ...ectors Plug in the TV and turn it on Warning Disconnect AC Power prior to making any disconnection or connection No Yes Replace The A board Does the power LED stay on when the TV is turned on Check th...

Page 24: ...ode and Defective Board Trouble Mode Communication error with IC8001 Defective Board A Board How to find the defective boards The A board is defective Warning Disconnect AC Power prior to making any d...

Page 25: ...lace The A board Go to the Next slide Yes Yes Yes Yes Yes NO NO NO NO NO Yes NO 25 Trouble Mode Dead No power Defective Board Possibility P A GS K Is there continuity between pins 8 and 10 of connecto...

Page 26: ...connectors K1 and A1 is OK Replace the K board Continue from Previous slide NO NO NO Yes Yes Yes Replace The P board Do the AC relays click after the TV is plugged into the AC line Replace The A boar...

Page 27: ...creen No Yes Connect the SU board Disconnect the SD Board from the SC board Turn the unit on Is there a picture at the upper half of the screen SC and possibly Panel Warning Disconnect AC Power prior...

Page 28: ...lace The A board Replace The A board Unplug the TV from the wall outlet Disconnect connector A5 from the A board Reconnect the TV and wait for it to come on by itself Is the screen completely white Is...

Page 29: ...AC Power prior to making any disconnection or connection 29 Yes Check the cable between connector A7 on the A board and P6 on the P board Note CN Connector Is there 15V at pin 1 of CN A7 on the A boa...

Page 30: ...This page is purposely left blank 30...

Page 31: ...Troubleshooting for Picture Problems 31...

Page 32: ...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 33: ...d at the left top corner Finally gas leakage will lead to the symptom No picture with buzz noise How to determine the defective board Start Upper or Lower half from front view Upper half Lower half Bo...

Page 34: ...Diagram Possible Cause Back side view IC9900 DATA DRIVER IC9500 A MICRO PROCESSOR IC4510 Peaks Lite IC1100 HDMI I F PICTURE OUTPUT IC8001 S F PROCESSOR PLASMA AI DISCHARGE CONTROL LVDS RECEIVER SU SD...

Page 35: ...iew SU SD SC SS Buffer IC Buffer IC Sustain Control Pulse Scan Control Pulse A Board defect Waveform OK SC SU SD Board defect Waveform NG Up to SC Board Refer to Diagnosis 3 on next page Result Cause...

Page 36: ...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 37: ...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 A board or C board Driver IC Driver IC Driver IC PDP Panel PDP...

Page 38: ...Trouble at Upper half SU board SC or A defect NG Area No Picture Picture noise Full Horizontal line etc Actual Symptom Full Horizontal line at both area SS board A defect Symptom Result Symptom Result...

Page 39: ...re Picture noise etc Trouble at Left half A board defect 1 2 Trouble at Right half A board defect Symptom Result Cyan noise Right side A board Actual Symptom Symptom Defective board NG Area Models 50i...

Page 40: ...re noise Full Vertical line etc Front view SC SU SD SS C1 C2 A 1 2 Trouble at Left half A or C2 board Panel defect 1 2 Trouble at Right half A or C1 board Panel defect Symptom Result Vertical line Pan...

Page 41: ...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 42: ...A or SC board SU SD defect Symptom Result Symptom Result Symptom Result Vertical line All over screen A board White balance NG A board Abnormal Picture SC board A SC Actual Symptom Picture noise Full...

Page 43: ...Examples of Symptoms and Remedies 43...

Page 44: ...een Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result SC Board Model 42 inch Result SC Board Model 42 inch Result...

Page 45: ...reen Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result...

Page 46: ...esult A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch...

Page 47: ...ll over the screen Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 4...

Page 48: ...ight half or Left half Model 50 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Mod...

Page 49: ...Upper or Bottom Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result A Board Model 42 inch Result SU Board Model 42 inch Result A Board Model 42 inch Result SC Board Model 4...

Page 50: ...from the wall outlet Self check Screen CHASSIS GPH11D 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 51: ...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 52: ...the adjustment of Vad which should be 105V When Vad 149V Voltage of Vscn is 4V 4V Note See the panel label for voltages that are not listed in the service manual Test point Volume Level T2 TPSC1 SC V...

Page 53: ...the adjustment of Vad which should be 105V When Vad 149V Voltage of Vscn is 4V 4V Note See the panel label for voltages that are not listed in the service manual Test point Volume Level T2 TPSC1 SC V...

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