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Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

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    #1

    Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

    So I just recently received a broken Panasonic TC-P50UT50.

    TV turns on fine (I receive a status light when on, and status light turns off when i manually shut it down) with remote as well a physical buttons. I also get sound from the HDMI input.

    The issue I am having is I get no picture. No glow, nothing.

    I normally would say a bad SC board or a bad buffer board, but I normally have blinks to go on. This has no blinks.

    Per Tom66's post,
    If you have sound: This is often a Y-sustain fault. There is usually at least one fuse on the Y-sustain. First, unplug the TV and give it 5 minutes to discharge the capacitors. Then, set your DMM to the 200 ohm range. Touch the red and black together. Note the reading, it should be around 0-2 ohms. Now, touch one probe on one end of the fuse, and the other probe on the other end. If your DMM reads "1" on the left hand side, or "OL", the fuse is blown. If you get the same value as when you touched the probes together, the fuse is not blown.

    You should replace the fuse. Should that then blow again, you need to repair or replace the Y-sustain. Diagnosing a particular fault is tricky and requires considerable experience. Unless the Y-sustain is very expensive, or difficult to repair, I would advise a simple swap of the board.
    So I am leaning on the SC board being my culprit at I get a OL reading in Ohms on the fuses I tested on the SC board. Does anyone have a second opinion? I guess I'm concerned about the no blinks, and I'm worried I'll need to replace the SU and SD buffers as well, and I don't want to fry a good SC board.
    Tags: None
    #2
    Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

    EDIT: I just ordered all 3 to be safe. I update with my findings when they come in.

    Comment

      #3
      Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

      OL is good , its a fuse! It has to be open , not closed.

      I think the post from Tom is related to a samsung plasma and not Panasonic.
      A defective SC board or other board on almost EVERY PANASONIC will result in a blinking pattern because the tv can not complete the test cycle of all boards when it turns on! It detects a error and shuts down.

      My personal feeling , and i am almost 100% sure , is you got a tv with a bad mainboard. ( bad BGA solder under GPU chip ).
      When the GPU is failing it usually wont result in a blinking pattern but just picture failing. ( stripes/weird colours etc ). You also got sound so the tv is actually working! ( It completed all test cycles from every board ).

      I dont think you got a bad sc/ss board and definately not a bad SU/SD board.

      I hope the boards were cheap , you can always save them as a spare.
      Last edited by Moreno83; 08-27-2017, 12:16 PM.
      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

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        #4
        Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

        That is great to hear. Is there something I can do to verify a bad main before I order one? Thanks for the quick response.

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          #5
          Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

          Well, I'm an idiot. I guess the previous owner took it upon himself to disconnect ribbons around the main and ss board. Once I reconnected everything I get 8 blinks. I'm doing my research now to hopefully diagnose this. Per Panasonic service repair guide, it can be ss, a, then panel.

          EDIT:Just performed the ss33 connector, tv turns on fine with no blinks. Check continuity on pins 1 and 2 for all 4 connectors from ss to panel. Turned the ss board over and it looks like someone deepfried the back of this thing. Thanks again for getting my wheels turning. I'm purchasing oleg's ebay service and sending it off. I'll post with an update if it resolved to help the next guy.
          Last edited by GermanPlumber; 08-27-2017, 07:26 PM.

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            #6
            Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

            Haha , well you could have said that a bit earlier haha! Happened to me also.

            It is a common problem on this board , I think 1 or 2 FETS that are shorted. I would not send it off for repair but order a new one. Especially when someone tried to bake it....
            I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

            Comment

              #7
              Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

              ? OL on my meter = open, open cct fuse = blown fuse

              What fuse we talking about on the SC? I did not even realise they had one.

              I would have guessed suspect main but sounds like you'll be on track with a SS repair.

              Comment

                #8
                Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

                SS board repair for that model is:
                1 DG302 & 1 RF2001
                They sell a kit on ebay for $12 that comes with a smd resistor that I have never had to use. A kit for $14 has all this plus an ic driver chip.

                Comment

                  #9
                  Re: Panasonic TC-P50UT50 No Picture, Have Sound (No blinks)

                  Just to help the next guy, it was a bad SS board. Used Oleg on ebay.

                  Comment

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