Panasonic TH-P50ST30A - standby LED goes out

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  • tw2005
    Badcaps Legend
    • Oct 2011
    • 6458
    • Australia
    #1

    Panasonic TH-P50ST30A - standby LED goes out

    Panasonic TH-P50ST30A - standby LED goes out.

    This is the one I did the Sc and SS board a while ago and only just starting using it fulltime for the last month.

    Working well, good image but it has a very unusual quirk.

    There's a few variations but this is what it doses.

    1. standby LED extinguishes, turn the main switch off at the front, you can hear the relays relax. Cycle the button, red stdby LED returns, use remote to turn on, green flashing and running.

    2. standby LED is lit, hit remote, starts blinking green then after a couple of seconds extinguishes. cycle front button, relays relax, red stdby LED returns, and remote on and she's running.

    Have not tried any fault finding on it yet, will wait until it gets really bad but throwing this one out there in case anyone has come across anything like it.

    I don't recall reading anything but I am expecting this to be a main board issue.
    Tags: None
    • tw2005
      Badcaps Legend
      • Oct 2011
      • 6458
      • Australia
      #2
      Re: Panasonic TH-P50ST30A - standby LED goes out

      should point out this is random but seems to occur if it's left in standby a long time

        Comment

        • tw2005
          Badcaps Legend
          • Oct 2011
          • 6458
          • Australia
          #3
          Re: Panasonic TH-P50ST30A - standby LED goes out

          Have not done much on this since but I did swap over a couple of ICs for the standby cct from another PSU with no change. Anyway an opportunity to get a spare A-board presented and put that in because I was thinking A-board.

          Sadly, after only being in standby a relatively short while I went to wake it up and it went to start but suddenly the relays collapsed and the led went out. To fix this the main power button needed to be cycled and then it was working again.

          So it appears it's a P board issue. very weird.

            Comment

            • Kilroys
              Senior Member
              • Feb 2014
              • 70
              • Sweden
              #4
              Re: Panasonic TH-P50ST30A - standby LED goes out

              Not sure, this is for a ST50, but it sounds like yours
              Attached Files

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                Comment

                • tw2005
                  Badcaps Legend
                  • Oct 2011
                  • 6458
                  • Australia
                  #5
                  Re: Panasonic TH-P50ST30A - standby LED goes out

                  Originally posted by Kilroys
                  Not sure, this is for a ST50, but it sounds like yours
                  Thanks, I'll check it out and see if there's anything similar about the circuits. It's unusual and hard to nail because it varies in time and somewhat random. Never turns off hilst running, it's just if it's been sitting in standby.

                  If turned off by the front switch, and on it never fails. Only waking up from standby.

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia
                      #6
                      Re: Panasonic TH-P50ST30A - standby LED goes out

                      Early days but the schematic in the tech bulletin is very similar to the part of the cct I just had to replace a FET for no standby, no relay clicks.

                      So it may be in this area I should look.

                      cheers

                        Comment

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