Panasonic Viera TC-P50ST50 Troubleshooting Manual Download | Manualshive

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Defective Panel Drive IC

Slide 38

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Summary of Contents for Viera TC-P50ST50

Page 1: ...aining Department Panasonic Consumer Marketing Company Of North America 2012 Plasma TV Troubleshooting Guide 2012 Plasma FHD TV ST Series 15th Generation TC P50ST50 TC P50UT50 Applies to models TTG120...

Page 2: ...g to repair this unit Do not use any service documentation other than the one designed for this particular model Techniques used on previous models may not necessarily apply to the model you are worki...

Page 3: ...V to run for more than 30 seconds while connectors or boards are disconnected NOTE When taking voltage reading place your meter s probe on the test point or pin indicated before connecting the TV to t...

Page 4: ...Energy Recovery Circuit An increase or reduction of the Energy Recovery Circuit output MID Shorted SUB5V Wrong diagnostic by the A board SC A C 7 BLINKS Scan Drive Circuit and Connection between the S...

Page 5: ...BLINKS Discharge Control Circuit DDC IC9300 Failure of IC9300 Wrong diagnostic by the A board A 10 BLINKS SUB3 3V_Sense OVP Over Voltage Condition of SUB5V or SUB3 3V Wrong diagnostic by the A board A...

Page 6: ...55 C 3 3V_DET DRVRST If no 3 3V in C1 C2 PCB Discharge Reset 6 8 blinks D_UHZ 7 AG3 SUB3 3V AD16 FFC_OFF_DET 6 TC P ST50 UT50 TNPH0989 Protection Circuit Block Diagram 1 of 2 TC P50ST50 A32 1 W28 P3 3...

Page 7: ...it goes off immediately 3 Fast Blinks P15V Missing 3 Fast Blinks at Plug in 3 Fast Blinks at Plug in Shorted 3 Fast Blinks at Plug in 3 Fast Blinks at Plug in SUB3 3V Over Voltage Dead Power LED neve...

Page 8: ...989 SUB3 3V SOUND_SOS 12blinks IC4900 Audio AMP 22 AD19 IC4901 Audio AMP 22 Normal H 11blinks Emergency 13 blinks IROM error quickly 3 blinks SUB5V SUB3 3V OV Det Circuit 10 Blinks if SUB5V or SUB3 3V...

Page 9: ...10 13 Blinks Failure When 1 9 10 or 13 blinks occur replace the A board Blink Code List of boards likely to cause this symptom No 1 No 2 No 3 No 4 1 A Board 9 Blinks A Board 10 Blinks A Board 13 Blin...

Page 10: ...ack lead is connected to ground Chassis ground Plug in the TV and turn it on No Does 15V appears momentarily on pin13 of CN P6 Start Here Replace the A board Replace the P board List of boards likely...

Page 11: ...s 15V appears momentarily on pin13 of CN P6 Start Here Replace the P board List of boards likely to cause this symptom Blink Code No 1 No 2 No 3 No 4 2 Blinks P A Panel C2 Slide 11 Unplug the TV Check...

Page 12: ...nector P6 Reconnect A6 and remove connector SC20 from the SC board and check for short circuit or low resistance on pin 13 of connector P6 Is there a short circuit or a resistance lower than 1 Kilo oh...

Page 13: ...onnector K1 from the A board Plug in the TV and press the power switch on the TV Unplug the TV and reconnect K1 Disconnect connectors A31 and A32 from the A board Plug in the TV Is the power LED blink...

Page 14: ...1 on the P board Also measure the resistance between chassis ground and pin 1 of connector P35 on the P board See the picture below for connectors location Note A dead short or a reading lower than 1K...

Page 15: ...short circuit With P2 and P11 disconnected measure the resistance between pin1 of connector SS11 on the SS board and ground Chassis Yes No Is there a short circuit Replace the SC board Replace the SS...

Page 16: ...No 3 No 4 4 Blinks P A Yes Place the positive lead of a voltmeter at pin 4 of connector P6 while the black lead is connected to ground Chassis ground Plug in the TV and turn it on No Is there 2V to 3V...

Page 17: ...y that all the cables on the SC board are properly seated Also check the ribbon cables and connectors on the A and C boards Unplug the TV and disconnect connector SC20 on the SC board Plug in the TV a...

Page 18: ...se 7 blinks shutdown on this model Note This page indicates the order in which these boards are likely to fail This information alone is not enough to diagnose which board is defective To determine th...

Page 19: ...g in the TV and turn it on Start Here List of boards likely to cause this symptom Blink Code No 1 No 2 No 3 No 4 No 5 No 6 SU SC SS A Panel 7 Blinks SD Is the power LED blinking 7 or 8 times 7 Times 8...

Page 20: ...e of pin 2 and pin 6 of bothSU41 and SD42 Using any of the VFG screws Floating ground screws as ground measure the resistance of pin 2 and pin 6 of either SU41 SC41or SD42 SC42 If a short circuit is f...

Page 21: ...board Yes No Does the TV turn on and stay on Black screen Replace both the SU and SD boards Replace the SC SU and SD boards SU SD are Defective To find out if the SC board is also defective follow the...

Page 22: ...SC50 Jig or just jump pins 1 and 2 of connector SC50 on the SC board Note Remove the jig or the jumper after completing the isolation procedure Actual SC50 Jig 4 Plug in the TV and turn it on Warning...

Page 23: ...y seated If the problem persists unplug the TV and remove connector SC20 from the SC board Plug in the TV and turn it on Start Here List of boards likely to cause this symptom Blink Code No 1 No 2 No...

Page 24: ...ure the resistance of pin 2 and pin 6 of bothSU41 and SD42 Using any of the VFG screws Floating ground screws as ground measure the resistance of pin 2 and pin 6 of either SU41 SC41or SD42 SC42 If a s...

Page 25: ...board Yes No Does the TV turn on and stay on Black screen Replace both the SU and SD boards Replace the SC SU and SD boards SU SD are Defective To find out if the SC board is also defective follow the...

Page 26: ...SC50 Jig or just jump pins 1 and 2 of connector SC50 on the SC board Note Remove the jig or the jumper after completing the isolation procedure Actual SC50 Jig 4 Plug in the TV and turn it on Warning...

Page 27: ...OK replace the A board Does the TV turn on and stay on Start Here Yes No Is continuity ok Replace the SS2 board Check connections between the SS board and the panel Check also connections between the...

Page 28: ...the A board Does the TV turn on and stay on Start Here Yes No Is continuity OK in all the connectors Replace the SS board Check connections between the SS board and the panel If ok then replace the pa...

Page 29: ...No 3 No 4 12 Blinks A Speaker Subwoofer Yes Unplug the TV and remove connector A12 from the A board Plug in the TV and turn it on No Is the TV still shutting down with 12 blinks Start Here Disconnect...

Page 30: ...the power switch Is there 2 3V present when the power button is pressed Unplug the TV and disconnect A1 on the A board Plug in the TV press the power switch on the TV Not the remote control Unplug the...

Page 31: ...SC20 8 Blinks 8 Blinks SC2 SS11 3 Fast Blinks 7 Blinks SC2 SS33 3 Fast Blinks 7 Blinks SC20 SS11 8 Blinks 8 Blinks SC20 SS33 6 Blinks After 11 Sec of Being on 6 Blinks After 11 Sec of Being on SS11 SS...

Page 32: ...UT50 TC P50ST50 Vsus 7 Blinks Vda Locked Solid Red LED 7 Blinks 3 Fast Blinks No SOS The TV stays on with black screen Shorted P15 Locked Solid Red LED 14 Blinks If TV is Turned On After the 2nd Relay...

Page 33: ...Video Lines Troubleshooting Slide 33...

Page 34: ...Troubleshooting Picture Distortions Slide 34...

Page 35: ...Troubleshooting Picture Distortions Slide 35...

Page 36: ...same waveform All the lines are connected mutually SS board doesn t cause horizontal lines problems All the electrodes on SS board are common If horizontal line is showed it is possible that defect o...

Page 37: ...Test Patterns Slide 37...

Page 38: ...Defective Panel Drive IC Slide 38...

Page 39: ...The End Slide 39...

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