Panasonic Plasma ST50 TC-P55ST50 P55ST50 8 blinks

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  • nick31
    New Member
    • Apr 2021
    • 3
    • USA
    #1

    Panasonic Plasma ST50 TC-P55ST50 P55ST50 8 blinks

    Hello,
    My Oct 2012 panny plasma quit working yesterday.
    It was on when it happened. It let out a bit of burned plastic/circuit board smell. I was not able to find any burned parts though.
    Now it produces 8 blinks. According to the repair manual, that points to SS/SS2 board(s).
    I completed the steps in the guide: unplugged SS33, the TV turned on with a black screen, no blinking codes. Then I checked the continuity between pins 1 and 2 of the connectors SS52, SS54-SS57. The continuity is ok in all of them. Guide suggests to replace SS/SS2 boards so I placed an order for them, TNPA5670AE/TXNSS1REUU and TNPA5532.

    I will update once I receive them. If you have any other suggestion on what else to check while I am waiting for the boards, please let me know.

    What I noticed, when turning on the TV, before the regular relay click, there is a short screeching/squealing noise from the P board. I did not notice it previously. Guide says that with SS11 disconnected (for example, no power from the P board to the SS board), there will be 8 blinks as well. With SS33 disconnected, SC board has green led light on, so I assume it is fine and it is not the one causing 8 blinks.

    I attached the snapshots from the guide I used.
    Attached Files
    Last edited by nick31; 04-21-2021, 11:00 AM.
    Tags: None
    • nick31
      New Member
      • Apr 2021
      • 3
      • USA
      #2
      Re: Panasonic Plasma ST50 TC-P55ST50 P55ST50 8 blinks

      Ok so today i replaced P board and that was it.
      Looking closer at the old P board, i noticed burned up capacitor c107. I attached the pictures. Before replacing this capacitor, is there anything else i should check?
      Attached Files

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales
          #3
          Re: Panasonic Plasma ST50 TC-P55ST50 P55ST50 8 blinks

          Check the mosfets tucked under the heatsink next to the burnt snubber capacitor C107
          Willing to help but I'm no expert.

            Comment

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