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Panasonic TC-P50ST50 Troubleshooting Manual
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Panasonic TC-P50ST50 Troubleshooting Manual

Plasma tv
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See also: Owner's Manual
2012 Plasma TV Troubleshooting Guide
th
2012-Plasma FHD TV – ST Series (15
Generation)
Applies to models:
TC-P50ST50
TC-P50UT50
National Training Department
Panasonic Consumer Marketing
Company Of North America
TTG120313CP120417

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Summary of Contents for Panasonic TC-P50ST50

  • Page 1 2012 Plasma TV Troubleshooting Guide 2012-Plasma FHD TV – ST Series (15 Generation) Applies to models: TC-P50ST50 TC-P50UT50 National Training Department Panasonic Consumer Marketing Company Of North America TTG120313CP120417...
  • Page 2 Important Information • To avoid the unnecessary replacement of multiple PC boards, please read this before beginning 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 working on.
  • Page 3 SOS Precautions When an abnormality occurs in the unit, the “SOS Detect” circuit is triggered and the TV shuts down. The power LED on the front panel will flash a pattern indicating the circuit that has failed. Cautions: If the power LED continues to blink even after the TV is unplugged, press and hold the power switch on the TV for a few seconds until the LED turns off.

  • Page 4: Power Led Error Code Definition

    Power LED Error Code Definition (1 of 2) LIST OF BOARDS POSSIBLY CASUSING THE FAILURE POWER LED CONDITIONS TRIGGERING ERROR CIRCUIT MONITORED THE SHUTDOWN CODE #1 Suspect # 3 Occasionally Not Often Panel Information SOS 1 BLINK Communication problem Missing P15V 2 BLINKS P15V form the P board P15V is not been generated by the P board.
  • Page 5 Power LED Error Code Definition (2 of 2) LIST OF BOARDS POSSIBLY CASUSING THE FAILURE POWER LED CONDITIONS TRIGGERING ERROR CIRCUIT MONITORED THE SHUTDOWN CODE #1 Suspect # 3 Occasionally Not Often Discharge Control Circuit Failure of IC9300 9 BLINKS DDC (IC9300) Wrong diagnostic by the A board Over Voltage Condition of SUB5V or SUB3.3V...
  • Page 6 Protection Circuit Block Diagram 1 of 2 (TC-P50ST50) Missing 2 Blinks P15V TC-P**ST50/UT50 P3.3V P15V (TNPH0989**) Shorted 3 Blinks Det. Circuit Missing 3 Blinks SUB3.3V 2 Blinks P15V At plug-in Shorted if P15 is Q9201 IC5000 missing Q9201 (STB3.3V) 2 blinks...

  • Page 7: Blink Code/Voltage Condition

    Blink Code/Voltage Condition (TC-P50ST50 - TC-P50UT50) No. of Blinks Voltage Condition TC-P50UT50 TC-P50ST50 Missing 2 Blinks 2 Blinks No power. The LED turns on Shorted briefly and then it goes off 3 Fast Blinks P15V immediately Missing 3 Fast Blinks at Plug-in...
  • Page 8 Protection Circuit Block Diagram 2 of 2 (TC-P50ST50) TC-P**ST50/UT50 SUB5V STB3.3V (TNPH0989**) SUB3.3V 10 Blinks Q8771 SUB5V or SUB3.3V is Q8771 too high 10 blinks AA15 IC8000-2 Peaks IC4900 SUB3.3V Audio SOUND_SOS SUB5V & AD19 12blinks Normal=“H” SUB3.3V IC4901 OV Det.
  • Page 9 Troubleshooting 1 -9 -10 - 13 Blinks Failure Blink List of boards likely to cause this symptom Code No.1 No.2 No.3 No.4 A Board 9 Blinks A Board 10 Blinks A Board 13 Blinks A Board When 1, 9, 10, or 13 blinks occur, replace the A board Slide 9...
  • Page 10 Troubleshooting 2 Blinks Failure (TC-P50ST50) Find information for P50UT50 on the next slide) List of boards likely to cause this Blink symptom. Code No.1 No.2 No.3 No.4 2 Blinks Start Here Place the positive lead of a voltmeter at pin 13 of connector P6 while the black lead is connected to ground (Chassis ground).
  • Page 11 Troubleshooting 2 Blinks Failure (TC-P50UT50) Find information for P50ST50 on the previous List of boards likely to cause this slide) Blink Start Here symptom. Code No.1 No.2 No.3 No.4 Place the positive lead of a voltmeter at pin 13 of connector P6 while the black lead 2 Blinks Panel/C2 is connected to ground (Chassis ground).
  • Page 12 Troubleshooting 3 Fast Blinks Failure (TC-P50ST50) Blink List of boards likely to cause this symptom. Start Here Code No.1 No.2 No.3 No.4 No.5 Unplug the blue- Unplug the TV. Check for short circuit or low Bluetooth 3 Blinks SS/SC Panel tooth module.
  • Page 13 Troubleshooting 3 Fast Blinks Failure At Plug-in (TC-P50UT50) Start Here Blink List of boards likely to cause this symptom. Code No.1 No.2 No.3 No.4 No.5 Unplug the blue- Unplug the TV. Connect the negative (Black Bluetooth tooth module. If the lead) of your DC volt- meter on chassis 3 Blinks C3/Panel...

  • Page 14: Power Supply

    Troubleshooting 3 Fast Blinks Failure At Power-On (TC-P50UT50) ( 1 of 2) Start Here Unplug the TV. Remove any residual charge from the Vsus and Vda lines. Use a 5W 500ohms resistor. Measure the resistance between chassis ground and pin 1 of connector P11 on the P board. Also measure the resistance between chassis ground and pin 1 of connector P35 on the P board.
  • Page 15 ( 2 of 2) From previous From previous slide (A) slide (B) Unplug connectors P2 and P11, on the P Shorted Shorted board. Measure the resistance between pin Vsus 1 of connector P11 and ground (Chassis) With P2 and P11 disconnected, Is there a measure the resistance between short...
  • Page 16 Troubleshooting 4 Blinks Failure List of boards likely to cause this Blink symptom. Code No.1 No.2 No.3 No.4 4 Blinks Start Here Place the positive lead of a voltmeter at pin 4 of connector P6 while the black lead is connected to ground (Chassis ground).
  • Page 17 Troubleshooting 6 Blinks Failure List of boards likely to cause this Blink symptom. Code No.1 No.2 No.3 No.4 6 Blinks Start Here Verify that all the cables on the SC board are properly seated. Also check the ribbon cables and connectors on the A and C boards.

  • Page 18: Troubleshooting 7 Blinks (Sos 7)

    Troubleshooting 7 Blinks (SOS 7) A 7 blinks shutdown can be caused by a failure of any or a combination of the following boards: SU/SD, SC, A, or the Panel. Is also possible for the SS board to cause 7 blinks shutdown on this model. most Possibly, common.

  • Page 19: Troubleshooting 7 Blinks Failure (Tc-P50St50)

    Troubleshooting 7 Blinks Failure (TC-P50ST50) Blink List of boards likely to cause this symptom. Code No.1 No.2 No.3 No.4 No. 5 No. 6 Find information for TC-P50UT50 on slides 23~26 Panel Blinks Start Here Check the wires between connector P2 on the P board and SC2 on the SC board.
  • Page 20 From before the previous page Troubleshooting 7 Blinks Failure (F5V/TPSC Resistance Check) Disconnect the AC prior to making any disconnection or connection. Wait at least 2 minutes before the removal of any connector. Unplug SU41 and SD42. Using any of the Using any of the VFG screws (Floating ground screws) VFG Screws (Floating ground screws) as as ground, measure the resistance of pin 2 and pin 6 of...
  • Page 21 From previous page Follow the procedure on the next slide to isolate Is there a the SU and SD boards. short circuit? Plug in the TV and press the power switch. Unplug the TV and follow step 2 of the previous slide.
  • Page 22 Troubleshooting 7 Blinks Failure (SU/SD Boards Isolation Procedure) Warning: When performing this procedure, isolate the SU and SD boards together at the same time. Do not attempt to isolate the SU or the SD boards individually. This could cause further damages to the TV Procedure: Remove the 4 VFG screws from the SU and SD boards.
  • Page 23 Troubleshooting 7 Blinks Failure (TC-P50UT50) Blink List of boards likely to cause this symptom. Find information for TC-P50ST50 on slides 19~22 Code No.1 No.2 No.3 No.4 No. 5 No. 6 Panel Blinks Start Here Check the wires between connector P2 on the P board and SC2 on the SC board.
  • Page 24 From before the previous page Troubleshooting 7 Blinks Failure (F5V/TPSC Resistance Check) Disconnect the AC prior to making any disconnection or connection. Wait at least 2 minutes before the removal of any connector. Unplug SU41 and SD42. Using any of the Using any of the VFG screws (Floating ground screws) VFG Screws (Floating ground screws) as as ground, measure the resistance of pin 2 and pin 6 of...
  • Page 25 From previous page Follow the procedure on the next slide to isolate Is there a the SU and SD boards. short circuit? Plug in the TV and press the power switch. Unplug the TV and follow step 2 of the previous slide.
  • Page 26 Troubleshooting 7 Blinks Failure (SU/SD Boards Isolation Procedure) Warning: When performing this procedure, isolate the SU and SD boards together at the same time. Do not attempt to isolate the SU or the SD boards individually. This could cause further damages to the TV Procedure: Remove the 4 VFG screws from the SU and SD boards.
  • Page 27 Troubleshooting 8 Blinks Failure (TC-P50ST50) List of boards likely to cause this Find information for Blink symptom. P50UT50 on the next slide) Code No.1 No.2 No.3 No.4 8 Blinks Panel Start Here Check all the cables between the SS/SS2 boards (SS52, SS54 ~SS57) and the panel. Make sure they are properly seated in the connectors.
  • Page 28 Troubleshooting 8 Blinks Failure (TC-P50UT50) Find information for P50ST50 on the previous slide) List of boards likely to cause this Start Here Blink symptom. Check all the cables between the SS board (SS52 ~SS57) and the panel. Code No.1 No.2 No.3 No.4 Make sure they are properly seated in the connectors.
  • Page 29 No.2 No.3 No.4 Speaker/ Blinks Subwoofer TC-P50ST50 Start Here Unplug the TV and remove connector A12 from the A board. Plug in the TV and turn it on Is the TV still shutting down with 12 blinks? Disconnect the speakers...
  • Page 30 Troubleshooting No Power/Dead Unit (Power LED is Off) Start Here Make sure the connectors on the P board are properly seated. Plug-in the TV but do not turn the power on. Unplug the TV. Place your volt- Unplug the TV and place your Does the AC relay meter on pin 1 of volt-meter on pin 6 of...
  • Page 31 2012 Plasma TV’s Behavior After Connectors Removal TV Behavior When Connectors are Removed on the SC and SS boards Connector on Connector on TC-P50ST50 TC-P50UT50 The SC Board The SS Board 7 Blinks 7 Blinks SC20 8 Blinks 8 Blinks...
  • Page 32 Behavior Comparison Between 2011 and 2012 Models When The TV Fails With Shorted Vsus, Vda, or P15V 2011 2012 Year X – S – ST GT - VT30 TC-P50UT50 TC-P50ST50 Series Vsus 7 Blinks Locked Solid No SOS. The 7 Blinks...
  • Page 33 Video/Lines Troubleshooting Slide 33...
  • Page 34 Troubleshooting Picture Distortions Slide 34...
  • Page 35 Troubleshooting Picture Distortions Slide 35...
  • Page 36 Troubleshooting Horizontal Line Problem PDP panel SS,SS2 SS,SS2 SCAN DRIVE Scan Drive： Pulse timing is shifted each horizontal electrode. 1 line abnormal Sustain Drive： All the lines are same waveform. All the lines are connected mutually. If horizontal line is showed, it is possible that defect SS board doesn't cause When FFC is damaged, it is needed to of one pin of scan drive IC or failure of connection to...

  • Page 37: Test Patterns

    Test Patterns Slide 37...
  • Page 38 Defective Panel Drive IC Slide 38...
  • Page 39 The End Slide 39...

This manual is also suitable for:

Tc-p50ut50St series
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