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Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

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    #1

    Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

    Just picked up a non-working Panasonic 50" plasma.

    Symptom - Powers on by pushing power button on TV only. Power light turns red and stays solid, no blinking, screen lights up. No picture.

    I've confirmed voltages to the board and confirmed the V type voltages are all in range. Confirmed solid green lights on both the SC and SS boards. From the TS guide the next board is the D logic board.

    I've looked up the board and there are several that could be installed. Can I use different version? The board that is in the set is the TNPA4439BJ. The BJ is stamped on and I'm guessing it is like a revision number? Will I have any issues swapping it out with another TNPA4439 board, or should I stick with searching for an exact match?
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    #2
    Re: Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

    for me looks like the problem is in the "A" card
    the "A" card function is DC-DC converter, speaker out and sound processor , AV terminal and AV switch , digital signal processor,micon , HDMI interface and peaks lite 2p
    HOPE THIS HELP

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      #3
      Re: Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

      Ok, validating all voltages in/out of A board. Interesting to see when I disconnected the signal cable from the A to D board I get a bright dispaly vs the dim.

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        #4
        Re: Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

        Confirmed it was a bad video board, or A board. Picked one up at a good price. Now have a great 50" plasma. After this success I picked up another model that is the TH-50PZ80U that had the two blink code. Has a bad D board and A board. So two blink code was D board, and no blink code with dim light was A board.

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          #5
          Re: Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

          I have the same problem with my Panasonic plasma 50PC77U. Set powers up, grey screen/no picture, solid red power light. Audio is fine. Where did you find this video/A board? Would you provide the Panasonic part number?
          Thanks

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            #6
            Re: Panasonic TH-50PZ800U No Picture/Sound No Blinking Power

            Search google for parts or ebay. You'll want to get your part numbers off the boards in your set to make sure you get the right part numbers as they sometimes are different even within the same model.

            Panasonic TNPH0692AFS A Board
            Panasonic TZTNP01LNTU D Board

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