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Troubleshooting 12 Blinks Failure

List of boards likely to cause this symptom.

Blink
Code

No.1

No.2

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 the speakers

one at a time to

determine which one is

bad

Replace the A

board

Slide 29

TC-P50ST50

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Summary of Contents for ST Series

Page 1: ...raining 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 TTG120313CP120417 ...

Page 2: ...ng 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 For accurate diagnosis during troubleshooting do not skip or alter the order of steps on the guide Slide 2 ...

Page 3: ...TV 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 the AC line The voltage you intent to measure may only appear for a brief moment Warning The Vsus line has large capacitors that hold the charge for some time even after the TV has been turned off and...

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 SC board and the SC board Missing or shorted Vsus Abnormality of the scan circuit output the 15V_F the scn_pro and Vscn circuit Loose or open Connection between the SC board and the SC board SC41 SC42...

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 12 BLINKS Audio Amp Circuit Defective Speaker Subwoofer Pinched Speaker Wire Wrong diagnostic by the A board A Speakers Subwoofer 13 BLINKS IC8000 Internal Communication Defective A board A Slide 5 ...

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 3V SOS 2 blinks AE20 Q9201 Q9201 P15V M28 C24 3 blinks 2 Blinks if P15 is missing 3 Fast Blinks At plug in if SUB3 3 is missing P15V Missing 2 Blinks Shorted 3 Blinks IC5000 REG STB3 3V RESET SUB3 3V ...

Page 7: ...n 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 never turns on 10 Blinks Missing 3 Fast Blinks at Plug in 3 Fast Blinks at Plug in Shorted 6 Blinks After 11sec 6 Blinks After 11sec SUB5V Over Voltage Dead Power LED never turns on 10 Blinks ...

Page 8: ...0989 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 is too high SUB5V Missing 3 Fast blinks at plug in Shorted 6 blinks after 11 sec Over Voltage 10 blinks Protection Circuit Block Diagram 2 of 2 TC P50ST50 Slide 8 ...

Page 9: ...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 Blinks A Board Slide 9 ...

Page 10: ...lack 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 to cause this symptom Blink Code No 1 No 2 No 3 No 4 2 Blinks P A Slide 10 Find information for TC P50UT50 on the next slide ...

Page 11: ...es 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 the resistance between TP201 P3 3V on the C2 board and chassis ground Replace the A board Yes No Is there a short circuit Defective Panel and or C2 board Find information for TC P50ST50 on the previ...

Page 12: ...nnector 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 ohm Yes No Replace the SC board Reconnect SC20 and remove connector SS33 from the SS board and check for short circuit or low resistance on pin 13 of connector P6 Is there a short circuit or a resistan...

Page 13: ...connector 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 blinking 3 or 8 times Replace the A board Slide 13 Unplug the blue tooth module If the blinking stops change the blue tooth module 3 times 8 Times Defective Panel or and the C3 board To time it takes to i...

Page 14: ...11 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 indicates a shorted or partially shorted line Slide 14 Is there a short circuit of the Vsus or Vda Yes No Start Here Replace the A board Shorted Vda Shorted Vsus Continue on next slide A Continue on...

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 and the SC boards Replace the SS Slide 15 From previous slide A From previous slide B 2 of 2 Yes No Replace the P board Is there a short circuit Unplug the TV and remove connector P35 Check the resis...

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 Approx momentarily on pin 4 of CN P6 Start Here Replace the A board Replace the P board Slide 16 ...

Page 17: ...fy 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 and turn it on No Did the number of blinks change to 8 blinks Start Here Replace the A board Replace the SC board 6 Blinks Slide 17 ...

Page 18: ...use 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 the cause of a 7 blinks failure follow the troubleshooting procedure on the following pages Most Likely SU or SD 2nd most common SC Possibly but not common A 1 2 3 Order of Failure SS Slide 18 ...

Page 19: ...ug 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 Times Unplug the TV and reconnect SS11 Remove SC20 from the SC board Plug in the TV and turn it on Unplug the TV Reconnect SC20 and follow step 1 of the next slide Replace the SS board Replace the A...

Page 20: ...ce 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 found proceed with step 2 If no short circuit is found isolate the SU and SD boards as illustrated on the next slide 1 2 Continue on the next page Step Step A short circuit indicates the failure of th...

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 procedure to on the next slide to isolate the SU and SD boards Plug in the TV and press the power switch Replace the SC board Follow the procedure on the next slide to isolate the SU and SD boards P...

Page 22: ...e 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 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 P N TZ...

Page 23: ...ly 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 3 No 4 No 5 No 6 SU SC A Panel 7 Blinks SD Unplug the TV and follow step 1 of the next slide Continue on the page after next Slide 23 Replace the A board Find information for TC P50ST50 on slides 19 ...

Page 24: ...sure 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 short circuit is found proceed with step 2 If no short circuit is found isolate the SU and SD boards 1 2 Continue on the next page Step Step A short circuit indicates the failure of the board where it...

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 procedure to on the next slide to isolate the SU and SD boards Plug in the TV and press the power switch Replace the SC board Follow the procedure on the next slide to isolate the SU and SD boards P...

Page 26: ...e 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 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 P N TZ...

Page 27: ...d 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 SS2 and the SS board and the panel If ok then replace the panel Check for continuity between pins 1 and 2 of connectors SS54 SS57on the SS2 board Do not plug in the TV Yes No Is continuity ok in all...

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 panel Unplug the TV Check for continuity between pins 1 and 2 of connectors SS52 SS57on the SS board Do not plug in the TV Slide 28 Unplug the TV Check the resistance between TP101 on the C1 board and ...

Page 29: ...2 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 the speakers one at a time to determine which one is bad Replace the A board Slide 29 TC P50ST50 ...

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 TV and place your volt meter on pin 6 of connector P6 Plug in the TV But do not turn the power on Replace The P board Check the AC Cord Unplug the TV and disconnect A1 on the A board Plug in the TV ...

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 SS33 The TV Stays on With Black Screen The TV Stays on With Black Screen SC2 SC20 SS11 3 Fast Blinks 8 Blinks SC2 SC20 SS33 6 Blinks After 11 Sec of Being on 6 Blinks After 11 Sec of Being on SC2 SC20 ...

Page 32: ...0UT50 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 Click The TV does not turn on The TV does not shut down It tries to turn on the LED briefly turns on then it goes off The TV does not turn on The TV does not shut down It tries to turn on the LED br...

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

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

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

Page 36: ...e 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 of one pin of scan drive IC or failure of connection to the panel or damage of electrode on the panel When FFC is damaged it is needed to replace the panel The FFC is bonded to the panel directly Slid...

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

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

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

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