please help me troubleshoot a panasonic plasma

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  • mattstolte
    Badcaps Veteran
    • Dec 2013
    • 612
    • usa

    #1

    please help me troubleshoot a panasonic plasma

    Ok I have been repairing tvs for about 6 months and have learned on my own. I can fix a lcd good but need help with plasmas. I have panasonic TC-P50S2. It will turn on but no picture. And will stay on.. I see nothing wrong. I hear a little humminh noise coming from y sus board. Please help. I would love to learn how to fix these
  • mattstolte
    Badcaps Veteran
    • Dec 2013
    • 612
    • usa

    #2
    Re: please help me troubleshoot a panasonic plasma

    Originally posted by mattstolte
    Ok I have been repairing tvs for about 6 months and have learned on my own. I can fix a lcd good but need help with plasmas. I have panasonic TC-P50S2. It will turn on but no picture. And will stay on.. I see nothing wrong. I hear a little humminh noise coming from y sus board. Please help. I would love to learn how to fix these
    anybody please? is this the right forum for this?

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #3
      Re: please help me troubleshoot a panasonic plasma

      In a dark room, do you get a slight glow from the display panel?
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • tw2005
        Badcaps Legend
        • Oct 2011
        • 6458
        • Australia

        #4
        Re: please help me troubleshoot a panasonic plasma

        Also check for green LED lit on the Sc and SS boards.

        photos of the layout of the Tv as it is.

        Is it same on TV and AV, No OSD?

        Any sound? can an antenna be connected to see or av source and see if sound.

        maybe hook up another TV/monitor to the AV out and see if you can get video out of that but OSD and menus will not show so you'll need a TV channel or Av source for the TV.
        Attached Files

        Comment

        • mattstolte
          Badcaps Veteran
          • Dec 2013
          • 612
          • usa

          #5
          Re: please help me troubleshoot a panasonic plasma

          Originally posted by tom66
          In a dark room, do you get a slight glow from the display panel?
          No. But isn't this trick only used for lcd for bad inverters. There's no inverters in plasmas

          Comment

          • mattstolte
            Badcaps Veteran
            • Dec 2013
            • 612
            • usa

            #6
            Re: please help me troubleshoot a panasonic plasma

            Originally posted by tw2005
            Also check for green LED lit on the Sc and SS boards.

            photos of the layout of the Tv as it is.

            Is it same on TV and AV, No OSD?

            Any sound? can an antenna be connected to see or av source and see if sound.

            maybe hook up another TV/monitor to the AV out and see if you can get video out of that but OSD and menus will not show so you'll need a TV channel or Av source for the TV.

            The green led lights are lit up on the ss and sc board. And the red light is lit on the main board

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia

              #7
              Re: please help me troubleshoot a panasonic plasma

              So in a totally dark room, turn it off then back on and watch the panel as it initialises.

              Comment

              • mattstolte
                Badcaps Veteran
                • Dec 2013
                • 612
                • usa

                #8
                Re: please help me troubleshoot a panasonic plasma

                Originally posted by tw2005
                So in a totally dark room, turn it off then back on and watch the panel as it initialises.

                Yes I see the grey light but no picture. So what would that be the main board? The main board also has the right light lit on it

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: please help me troubleshoot a panasonic plasma

                  Originally posted by mattstolte
                  No. But isn't this trick only used for lcd for bad inverters. There's no inverters in plasmas
                  Older generation and some newer generation plasmas have a very visible dark glow.

                  The presence of glow indicates a likely main board fault - tw2005 may have some additional information - it might be possible to get full white pattern by removing power to main CPU? As on the PZ70/PZ80s.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment

                  • mattstolte
                    Badcaps Veteran
                    • Dec 2013
                    • 612
                    • usa

                    #10
                    Re: please help me troubleshoot a panasonic plasma

                    Originally posted by tom66
                    Older generation and some newer generation plasmas have a very visible dark glow.

                    The presence of glow indicates a likely main board fault - tw2005 may have some additional information - it might be possible to get full white pattern by removing power to main CPU? As on the PZ70/PZ80s.

                    Yeah if its main board I looked them up there like 150. And this tv don't have a stand so its not worth me buying a new main board and stand. I won't make profit. So ill just part it out

                    Comment

                    • tw2005
                      Badcaps Legend
                      • Oct 2011
                      • 6458
                      • Australia

                      #11
                      Re: please help me troubleshoot a panasonic plasma

                      Originally posted by mattstolte
                      Yes I see the grey light but no picture. So what would that be the main board? The main board also has the right light lit on it
                      Yep, that's what i was hoping/suspecting. The only info i can share is of a particular situation I created rebuilding a SC board.

                      It could be Main or SC. If you're into component repair you could take a gamble and try replacing the 20 pin octal buffer ICs but at which end is the question.

                      Whilst working on a SC, it was a battle the whole way but I ended up a TV which reacted exactly as you described, on,running, etc, faint glow, sound because the TV was hooked up and tuned in.

                      So swapped it out and ended up with a 7 blink but getting a change meant i had the right chip, so replacing it again with a scavanged part off a board it then came good. post 101 on, https://www.badcaps.net/forum/showth...t=26322&page=6

                      IC16561(IC561) was the culprit for me, but I reckon could also be on a similar IC on the A where it leaves the board at A20.

                      C0JBAU000088, C0JBAU000043 are the same and Panasonic numbers, marked C541 (SC,SS & C boards have them)Unfortunately the size is fairly unique and direct from Panasonic at about $2-3 each.

                      On the A board, IC9400,IC9401,IC9402 C0JBAZ002692 $2-3 ea could be suspects too. they are the next size up should be obtainable as VHCT541A but available in several sizes which you'd have to check.

                      I was using my TV as a test mule so I knew the A was good, something you don't but you could hook it up and see if any video was coming from AVout by either attaching the antenna assuming it's tuned in. If you got AV out I'd feel comfortable there was hope salvaging it.

                      With mine i proved a bad octal buffer IC could incorrectly trigger a SOS7 and also have the Tv run fine with no display because the data lines go through those too.

                      I replaced it and it came good.



                      depends if you want to gamble and persevere or not with it but it will be hard to sell either the A or SC for parts as these 2 are would be on the suspect list.

                      Or, park it until another one or similar model came along like


                      TC-P50S2,TC-P50U2,TX-P50S20B,TX-P50U20B

                      Not every TV is a winner, sometimes the learning experience is worth something and breaking even or keeping it for youself is also very satisfying.

                      There is a guy on this forum who has been in search of a TNPA5105AB for a 50S2 for ages so he may be a candidate for taking a punt on your SC as is.
                      Last edited by tw2005; 03-31-2014, 03:16 AM.

                      Comment

                      • mattstolte
                        Badcaps Veteran
                        • Dec 2013
                        • 612
                        • usa

                        #12
                        Re: please help me troubleshoot a panasonic plasma

                        Originally posted by tw2005
                        Yep, that's what i was hoping/suspecting. The only info i can share is of a particular situation I created rebuilding a SC board.

                        It could be Main or SC. If you're into component repair you could take a gamble and try replacing the 20 pin octal buffer ICs but at which end is the question.

                        Whilst working on a SC, it was a battle the whole way but I ended up a TV which reacted exactly as you described, on,running, etc, faint glow, sound because the TV was hooked up and tuned in.

                        So swapped it out and ended up with a 7 blink but getting a change meant i had the right chip, so replacing it again with a scavanged part off a board it then came good. post 101 on, https://www.badcaps.net/forum/showth...t=26322&page=6

                        IC16561(IC561) was the culprit for me, but I reckon could also be on a similar IC on the A where it leaves the board at A20.

                        C0JBAU000088, C0JBAU000043 are the same and Panasonic numbers, marked C541 (SC,SS & C boards have them)Unfortunately the size is fairly unique and direct from Panasonic at about $2-3 each.

                        On the A board, IC9400,IC9401,IC9402 C0JBAZ002692 $2-3 ea could be suspects too. they are the next size up should be obtainable as VHCT541A but available in several sizes which you'd have to check.

                        I was using my TV as a test mule so I knew the A was good, something you don't but you could hook it up and see if any video was coming from AVout by either attaching the antenna assuming it's tuned in. If you got AV out I'd feel comfortable there was hope salvaging it.

                        With mine i proved a bad octal buffer IC could incorrectly trigger a SOS7 and also have the Tv run fine with no display because the data lines go through those too.

                        I replaced it and it came good.



                        depends if you want to gamble and persevere or not with it but it will be hard to sell either the A or SC for parts as these 2 are would be on the suspect list.

                        Or, park it until another one or similar model came along like


                        TC-P50S2,TC-P50U2,TX-P50S20B,TX-P50U20B

                        Not every TV is a winner, sometimes the learning experience is worth something and breaking even or keeping it for youself is also very satisfying.

                        There is a guy on this forum who has been in search of a TNPA5105AB for a 50S2 for ages so he may be a candidate for taking a punt on your SC as is.

                        You are very smart so how can I check these parts on a meter on a board?

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #13
                          Re: please help me troubleshoot a panasonic plasma

                          Originally posted by mattstolte
                          You are very smart so how can I check these parts on a meter on a board?
                          I'm not that smart, absolutely no idea. For me it was a process of elimination, bit of guesswork and thinking how could you end up with the screen primed and no picture. i also knew the A board was good. The drive signals only enter via SC20, route through those ICs. Had it not changed to a SOS blink I could very well moved away from that IC to the other and maybe never worked it out.

                          but the beauty of perseverance, sometimes you get a nice surprise and 2 things were discovered. that one IC caused both those conditions.

                          So whilst you may have a different cause at least it's confirmed that it could be as simple as replacing those or the ones on the A board.

                          An oscilloscope though would be the way togo for tracing the signals to see what's missing but I've never gone to that level and at home I have very little other than a Fluke and soldering gear.

                          Soldering those smaller ICs though, very challenging, had to use a magnifier and plenty of flux to get it done. very close pitch on thos legs.

                          Comment

                          • amules
                            Member
                            • Apr 2014
                            • 12
                            • USA

                            #14
                            Re: please help me troubleshoot a panasonic plasma

                            I have the same issue with my TC-P50S2.. No sound though, so I believe it is the A board.. I'd love to fix this but I bought the set for $20 and looking to profit. So I'll probably sit on it until I come across one that need a SC board or broken screen... I have a TC-P50G25 that has the same buffer boards but not the A board..anyone out there need any parts and want to trade?

                            Comment

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