2x lg 50pg3000 no picture just white line and funny image

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  • wreksta
    Badcaps Veteran
    • Aug 2013
    • 508
    • england

    #1

    2x lg 50pg3000 no picture just white line and funny image

    hello al got this one in yesterday then the same today all displaying same fault

    check here
    http://www.youtube.com/watch?v=OIDqrQGmngU

    as I cant find picture nor do I have the camera its at the mothers

    I have 2x these sets all fuses voltages etc on y main and z sus all check out as do vy vsc vzb I tried to jump auto exe gen but still same picture

    any ideas
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: 2x lg 50pg3000 no picture just white line and funny image

    Check -Vy, Vsc. Likely buffer boards, again.
    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

    • wreksta
      Badcaps Veteran
      • Aug 2013
      • 508
      • england

      #3
      Re: 2x lg 50pg3000 no picture just white line and funny image

      there must be a way to check to see if defo blown mate the buffers I mean can you assist

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: 2x lg 50pg3000 no picture just white line and funny image

        Does it have two buffer boards in it?
        You can check for sure, but you need a good oscilloscope.
        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

        • wreksta
          Badcaps Veteran
          • Aug 2013
          • 508
          • england

          #5
          Re: 2x lg 50pg3000 no picture just white line and funny image

          yes 2 buffers in each one of the top y buffers defo broke as no screen will show if it connected

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: 2x lg 50pg3000 no picture just white line and funny image

            Do you get anything with just bottom buffer installed? Same image?
            Do you have an oscilloscope? If you plan to repair plasmas without board-swapping lots, you will need to invest in one.
            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

            • wreksta
              Badcaps Veteran
              • Aug 2013
              • 508
              • england

              #7
              Re: 2x lg 50pg3000 no picture just white line and funny image

              no I get same image black with a load of colours all over no image though and a white line that jumps about screen I think that's the no signal box moving about the screen

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: 2x lg 50pg3000 no picture just white line and funny image

                Sounds like your bottom buffer is bad and your top is maybe OK, but it's not getting a signal (buffer boards chain signals on most 720p sets like this.)
                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

                • wreksta
                  Badcaps Veteran
                  • Aug 2013
                  • 508
                  • england

                  #9
                  Re: 2x lg 50pg3000 no picture just white line and funny image

                  is there anything I can do to try an dget an image

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: 2x lg 50pg3000 no picture just white line and funny image

                    Unless you have one set with opposite failure (top bad, bottom good) I can't see that being possible. As I said previously, if you don't want to just board swap you really need a scope to do the tests.
                    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

                    • wreksta
                      Badcaps Veteran
                      • Aug 2013
                      • 508
                      • england

                      #11
                      Re: 2x lg 50pg3000 no picture just white line and funny image

                      so that image its displaying defo bad buffers al of them

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: 2x lg 50pg3000 no picture just white line and funny image

                        Are you looking for a guaranteed answer? A defective Y-sustain could also cause this issue (with the poor colours; Vset-dn/Vset-up ramp poor), but you would have at the very least a defective buffer.

                        You can get a basic analog oscilloscope for around £80, which will suffice for most checks. You look like you repair a lot of TVs so it's worth considering buying one to save money on replacing parts.
                        Last edited by tom66; 11-21-2013, 05:25 PM.
                        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

                        • wreksta
                          Badcaps Veteran
                          • Aug 2013
                          • 508
                          • england

                          #13
                          Re: 2x lg 50pg3000 no picture just white line and funny image

                          yes tom I think you are right mat going to have to invest lol

                          Comment

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