Panasonic P42c2 4 red blinks

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  • powermatt
    New Member
    • Oct 2014
    • 2
    • UK
    #1

    Panasonic P42c2 4 red blinks

    Guys

    SO far Ive isolated the SN (TNPA5066AB) board still 4 blinks, then isolated SS (TNPA5072) also then get 7 blinks, reconnected SN board and still get 7 blinks, reconnect both boards and get 4 blinks.

    Anyone got any ideas why it won't be the P board, or anything else I should try?

    Many Thanks

    Matt
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Panasonic P42c2 4 red blinks

      yeah, the SS TNPA5072 often fails short cct on SS11 ( vsus rail from the PSU) forces PSU to trigger SOS 4 but it's not a PSU fault

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia
          #3
          Re: Panasonic P42c2 4 red blinks

          Advise you also have a good poke around the Sn and see if any Transistors are short, check SN2 resistance, check the energy recovery cct short pins 1-5 , that's where the SN and SS connect(at SN3).
          Check smd diodes D451, D441 alsoo can fail short.

          it's feasible for the SS to kill the Sn especially if you're experimenting disconnecting boards. I blew up a Sn not isolating Sn3 with a shorted SS recently.

          Repair of the SS is straight forward but SMD work

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