Panasonic TC-P54G25 8 blinks

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  • dhyde
    New Member
    • Sep 2016
    • 5
    • USA
    #1

    Panasonic TC-P54G25 8 blinks

    Hello,

    My Panasonic TC-P54G25 manufactured Nov 2010 has worked great for several years. A few weeks ago it would turn itself off and the front power LED would blink 8 times. I would unplug/plug the system and it would come on and run for several weeks then shut off again. Now the set comes on and runs for 5 minutes before shutting off with 8 blinks. I researched the issue and most point to the SS board (my set uses the TNPA5082 board on the right side and the TNPA5081 board on the left side looking at the back of the set). The first step seems to be to make sure the flex cables are securely attached to the right SS board.

    If you have any advice or Panasonic service guides I would greatly appreciate the help. I hate to throw away the set -- it has a great picture and up until this problem has worked great.

    Thanks
    dhyde
    Tags: None
    • Moreno83
      Badcaps Legend
      • Jun 2014
      • 2008
      • The Netherlands
      #2
      Re: Panasonic TC-P54G25 8 blinks

      Could you please provide some pictures of the set? ( The boards )

      It sounds like a mainboard problem deu to overheating but pictures first!
      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

        Comment

        • dhyde
          New Member
          • Sep 2016
          • 5
          • USA
          #3
          Re: Panasonic TC-P54G25 8 blinks

          Starting from the rear right side of the TV the images are: both SS and A board, just right SS board, just A board, power supply, left ss board and the entire left side.

          I think I have the board names (ss, a...) right but I'm not sure.

          The right ss board has the part number TNPA5082
          The A Board (has all the video connectors) part number TNPH0834
          The left side ss board part number TNPA5081

          If you need more detailed pictures of any boards let me know

          Thanks for your help
          Attached Files

            Comment

            • Moreno83
              Badcaps Legend
              • Jun 2014
              • 2008
              • The Netherlands
              #4
              Re: Panasonic TC-P54G25 8 blinks

              Here you have the service and troubleshooting guide.
              Troubleshooting guide , page 43/44 shows 8 blink code.

              It does look like a SS or A board problem! Could you try the steps provided in the manual?
              Attached Files
              I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                Comment

                • dhyde
                  New Member
                  • Sep 2016
                  • 5
                  • USA
                  #5
                  Re: Panasonic TC-P54G25 8 blinks

                  Thank you very much for this information. I will perform the steps and post the results this evening when I get home.

                    Comment

                    • Moreno83
                      Badcaps Legend
                      • Jun 2014
                      • 2008
                      • The Netherlands
                      #6
                      Re: Panasonic TC-P54G25 8 blinks

                      Your welcome! With a multimeter you will get some results.

                      The fets and diodes are marked with Q and D on all boards.
                      Q is a mosfet wich you can measure in diode mode , measure outer legs.
                      D is a diode. Black prope on middle pin and red on left/right pin. In both situations a beep is usually not good.

                      Also measure the prong connectors on SC and SS board in diode/beep mode. Could you also check the back of the SS board for bad solder? Maybe reflow the solder and also the ground area's ...maybe some arching happened.

                      There is a huge time difference so evening for you is midnight for me!


                      good luck!
                      I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                        Comment

                        • dhyde
                          New Member
                          • Sep 2016
                          • 5
                          • USA
                          #7
                          Re: Panasonic TC-P54G25 8 blinks

                          I followed the troubleshooting guide for 8 blinks. When I checked the connectors from the SS card to the panel one of the ribbon cable connectors seemed loose so re-seated all three (one was on the small lower SS2 board). I also checked continuity between pins 1 and 2 on the 2 connectors from SS to the panel they were ok (one was 1 ohm the other 2 ohms). Checked between pins 6 and 7 on connector between SS and SS2 and again 2 ohms (seems ok). I plugged everything up and the TV ran fine for 30 minutes or so they shut off and now shows 10 blinks.

                          The debug flow diagram for 10 blinks has two scenarios, one for 10 blinks at plug in and another for power on. Neither seem to fit my case since the set ran for several minutes before shutdown. Will be away from home tomorrow but I'll pick the debug back up in a day.

                          Thanks
                          David

                            Comment

                            • Moreno83
                              Badcaps Legend
                              • Jun 2014
                              • 2008
                              • The Netherlands
                              #8
                              Re: Panasonic TC-P54G25 8 blinks

                              Strange symptom. I would not be surprised if this is a mainboard problem deu to overheating. ( BGA Solder problem ).
                              Why do i think that? The parts on the SS / SC board / PS either work or dont work.

                              I think that the CPU is overheating causing the set to shut down with a blink code. Follow the chart for 10 blinks and see what happens. If you get weird results from the tv that dont match the troubleshooting guide then i would replace the mainboard.

                              Also check on all boards if the screws are tightened and all grounding is ok.
                              I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                                Comment

                                • Moreno83
                                  Badcaps Legend
                                  • Jun 2014
                                  • 2008
                                  • The Netherlands
                                  #9
                                  Re: Panasonic TC-P54G25 8 blinks

                                  https://www.badcaps.net/forum/showthread.php?t=57049

                                  Follow these steps as well and also check for cold solder on all boards.
                                  I only repair Panasonic plasma tv's! Currently owning a TX-P55VT50 and still searching for a ZT60!

                                    Comment

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