Panasonic TC-P50V10 6 blinks

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  • keats11
    Senior Member
    • Nov 2012
    • 88
    • USA
    #1

    Panasonic TC-P50V10 6 blinks

    I have a Panasonic TC-P50V10 with 6 blinks. I followed through the Panasonic training manual for this model, and it points to the SC board. However there are no shorted components that I could identify on this board. Supposedly the energy recovery circuit is what is throwing this code. Incidentally while working on this TV also noticed one of the fans don't work, so I had it jumped (yellow-to black wire) again according to some instruction I read somewhere about how to isolate the fans. I measured the voltage at the SOS6 test point and it climbs to almost 5 v and then drops to zero. It is at 0V when the led is blinking 6 times. I saw a similar thread for a 6 blink problem, but it didn't seem to have any resolution. Posting this here with the hope of resolving this one and helping others.
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    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Panasonic TC-P50V10 6 blinks

      Search tnpa4782 or the model for other posts. That should give an idea of parts that fail. Hombre has done a repair of this board. Unusual to find nothing shorted if the board has failed.

      SC fail is very common in this model too. The SOS6 detect I've looked at a little but on initial startup it goes high then low I think about 4.4v on mine for high.

      ignoring the front LED, is it high until you hear the relay click ?

      I'm pretty sure with these you can try this, disconnect p2,p11p35 and the 3 white ribbons on the A board and turn on. should stay on. that will at least confirm the A board is not misdetecting. Don't reconnect p2,p11,p35 for 5 mins or check for residual voltage with a meter.

      If it passes that, I'd be going with SC as failure.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: Panasonic TC-P50V10 6 blinks

          Do you get a brief green light lit on the SC board?
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

            Comment

            • keats11
              Senior Member
              • Nov 2012
              • 88
              • USA
              #4
              Re: Panasonic TC-P50V10 6 blinks

              @TW2005:
              I unplugged A06, A25 and A35, the three connectors going to the A board from the power supply and also the 3 flat ribbons that control the Sustain and the address boards and in that state you cannot turn the TV on at all. Probably because, the A board cannot send a P-On signal to the PSU.

              @Tom66:
              Yes the green LED comes on, the TV throws error code and shuts down, and the LED goes out on its on, possibly when the charge drops low enough. What does the LED signify?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Panasonic TC-P50V10 6 blinks

                  The LED indicates the SC board ER circuit is ok with pre-charge, so there is no short there. If it goes out immediately (or once the set tries to work) it indicates the ER circuit can deliver energy but somehow it's not being recovered back into it. Or, if it doesn't go out immediately and just fades, it indicates it can't discharge it.

                  I'd be checking the IGBTs responsible for SUS/ER, the gate drivers, inductors for cold joints, etc.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                    Comment

                    • keats11
                      Senior Member
                      • Nov 2012
                      • 88
                      • USA
                      #6
                      Re: Panasonic TC-P50V10 6 blinks

                      Ok, so took the board out and measured diode drops. Found Q661 shorted across all 3 legs. From the block diagram I saw online for this board, Q661 is connected between VAD and V_FGND. It is also controlled by a small transistor Q818, which although I had read in other posts regarding another similar board (TNPA5081) fails, looked OK in this case. So sounds like I have to just try to replace this one FET and see if it works. Would love to hear if anyone else has any thoughts.

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia
                          #7
                          Re: Panasonic TC-P50V10 6 blinks

                          Originally posted by keats11
                          Ok, so took the board out and measured diode drops. Found Q661 shorted across all 3 legs. From the block diagram I saw online for this board, Q661 is connected between VAD and V_FGND. It is also controlled by a small transistor Q818, which although I had read in other posts regarding another similar board (TNPA5081) fails, looked OK in this case. So sounds like I have to just try to replace this one FET and see if it works. Would love to hear if anyone else has any thoughts.
                          I would advise against trying just that FET, most likely is not just that and will end up damaging more components making it even more difficult to fault find. try and search for hombre's thread as he has managed to fix one after a couple of goes. Only other option is get it repaired which is not cheap.

                          I don't recall anyone replacing just Q661 and having a win

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK
                              #8
                              Re: Panasonic TC-P50V10 6 blinks

                              If Q661 fails when the rest of the board is ok, it can kill the buffers, so be VERY careful.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                Comment

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