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(Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

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    #1

    (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

    Greetings from SoCal I am new to this forum but not new to forum world. I come from Automotive end of side which is my main passion in life. Give the automotive nature, I love fixing and restoring things and I have in the past fixed many simple electronics, soldering, etc.. but this is a bit more involved so I found this forum, and I am very glad I did.

    I picked up a Panasonic TC-P60VT60 with the 7 BLINK error.
    Upon removing the back plate I found spider webs, dead spiders, and an amazing amount of dust. I did my best to clean the surface of the boards with a portable vacuum but will be using compressed canned air to do a more thorough job shortly.

    I have completed the following evaluations:

    1. Tested for grounded leads on the SD & SU boards and found none
    2. Disconnect the SD board from SC board - Power on = 7 Blinks
    3. Disconnect the SU board from SC board - Power on = 7 Blinks
    4. Jump SC50 on SC board - Power on = 7 Blinks

    At this time, based on what I have found, and if I am understanding it correctly, the suspect is SC board. I have removed the SC board and had a very close look at it but are unable to see any visual damage, burn marks or blown components. I have also not seen any noticeable signs of arching between the board and grounding screws. I would like to prove that the SC board is the issue, in perfect world identify the issue and attempt to repair it. If I am unable to repair it, I would like to identify the SC board to be an issue before purchasing a replacement.

    Question 1: What is the proper procedure to prove the SC Board being the issue
    Question 2: Is there a guide that I can follow to determine the component(s) on the SC board that are at fault.

    UPDATE: I believe I just found my answer to Q1 & 2 above:

    https://www.badcaps.net/forum/showpo...6&postcount=10

    I will be adding images shortly via my phone app! (Is Badcaps.net on Tapatalk?)
    Last edited by SentraDude; 04-04-2023, 04:43 PM.
    Tags: None
    #2
    Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

    GPF16DU Chassis service manual
    Attached Files

    Comment

      #3
      Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

      Thank you!! I spend about half an hour going through the 7 blinks troubleshooting flowchart in the TCP50s60 and realized my model is not specified in the models table, will it still apply? I followed the troubleshooting in the GPF16DU and it was short and sweet, at the end I still had 7 blinks. I believe this is due to VAD/VSCN. Is there a guide on checking these circuits ? Thank you !
      Last edited by SentraDude; 04-04-2023, 07:57 PM.

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        #4
        Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

        If you haven't already check the transistors on the heatsink/s, at least a short test, make sure none of the pins test short to either of the other 2 pins of said component.

        Comment

          #5
          Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

          Unhook SU board and see if you still get 7 blinks, make all cable connections and dis-connections with tv unplugged from power, make sure all retaining/ground screws on all boards are tight not loose but not so tight as to crack a board, lock washers are recommended.
          Last edited by nomoresonys; 04-05-2023, 12:43 AM.

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            #6
            Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

            Good evening - and thank you!
            I’ve done all of the above and with disconnecting both of the buffer boards I still receive the 7 blinks. I’ve tested all of the transistors and not finding shorted ones..

            Comment

              #7
              Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

              Received my new SC board today!! Is there a way to test the buffer boards while out of TV to ensure no shorts present ? Other than running meter along the buffer connections?

              Comment

                #8
                Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                Testing example there, for sure test before you install, I made the mistake of not testing a used buffer board I bought, installed it, tv didn't work, took it out sure enough it was shorted, but since I didn't test it before hand, I had no way of knowing if it was bad to start or if my Y board knocked it out, so had to eat that cost: https://www.youtube.com/watch?v=V6hxf9sARMY

                Comment

                  #9
                  Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                  Thank you!!!! Only clarification I'd ask for please is on the white plug, which lead is he putting the red probe on? I have the TNPA5794 and TNPA5793 .

                  Comment

                    #10
                    Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                    See if that one helps: https://www.youtube.com/watch?v=51SZsfH60EY

                    Comment

                      #11
                      Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                      https://www.youtube.com/watch?v=7cKRSnnNpFQ

                      Comment

                        #12
                        Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                        Excellent !! Thank you so much - I just wanted to double triple check before hooking it up to power. SC board replacement repaired the TV.

                        Comment

                          #13
                          Re: (Another) 7 BLINK TC-P60VT60 Panasonic - NEWBIE

                          Glad to hear it, nice save.

                          Comment

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