Pansonic plasma TV diagnosis & repair

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  • mostachio
    Member
    • Apr 2014
    • 22
    • New Zealand
    #1

    Pansonic plasma TV diagnosis & repair

    I am helping a friend fix his Panasonic TH-42PV8AZ plasma tv. I have basic electronic knowledge but have a multimeter, soldering iron, heat gun etc.

    Problem Symptoms:
    When the TV is turned on it flashes the red light 12 times repetitively.

    According to panasonic blick codes this suggests:
    Sound SOS H Board

    I've done some research which suggests it could be anything from:
    A short to ground
    bad speakers
    Bad logic board (TNPH0713)
    Bad power board (LSEP1260 OR LSJB1260)


    I've tried looking for physical signs of burnt components / bad capacitors,
    checked fuses / diodes / connectors, looking for a pinout for the power board to test outputs however unable to find one.

    Can anyone please offer some help with diagnosing which board/component is at fault so that I can either order a replacement part or possibly fix it? or provide pinouts diagram etc for the power board etc so i can test these.

    Thanks!!!
    Tags: None
    • trebo
      Badcaps Veteran
      • Feb 2010
      • 514
      • Wales, UK
      #2
      Re: Pansonic plasma TV diagnosis & repair

      for best help ask moderator to move you to the TV section
      good luck

        Comment

        • mostachio
          Member
          • Apr 2014
          • 22
          • New Zealand
          #3
          Re: Pansonic plasma TV diagnosis & repair

          My bad, thank you, could a moderator please move this to the TV section?

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia
              #4
              Re: Pansonic plasma TV diagnosis & repair

              http://elektrotanya.com/?q=showresul...oria=&kat2=all

              Sound SOS, checkpoints are P and A boards.

              "12 Blinks SOS: On the A board, transistor Q2301 monitors the Sound 15V line and the operation of the audio power amplifier IC2301. If the audio output circuit, IC2301, or the 15V lines develops a short to ground, transistor Q2301 goes into conduction and applies a high to pin 70 of the MPU, IC1100, triggering a SOS condition. The power LED blinks 12 times.
              A short circuit in the sound P15V normally shuts the TV down and the power LED blinks 2 times. It can also cause the TV to shutdown and make the power LED blink 12 times."

                Comment

                • mostachio
                  Member
                  • Apr 2014
                  • 22
                  • New Zealand
                  #5
                  Re: Pansonic plasma TV diagnosis & repair

                  Thanks, appreciate it. I will study the service manual attempt to diagnose which... Any further help would be great, though i'm guessing to test 15v line and ic2301, and if both ok assume audio output circuit and replace A board?

                    Comment

                    • c_hegge
                      Badcaps Legend
                      • Sep 2009
                      • 5219
                      • Australia
                      #6
                      Re: Pansonic plasma TV diagnosis & repair

                      Moved to TV troubleshooting
                      I love putting bad caps and flat batteries in fire and watching them explode!!

                      No wonder it doesn't work! You installed the jumper wires backwards

                      Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                      Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                        Comment

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