Cad bad caps make vertical lines on the screen?

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  • gilly1984
    Badcaps Veteran
    • Jun 2012
    • 751
    • UK
    #1

    Cad bad caps make vertical lines on the screen?

    Hi guys, long time no see. Hope you're all ok.

    Just bought a tv with vertical lines on it, i get no pic in the background so cannot change source or play with settings.

    The lines are on the left hand half of the screen.

    Checked the psu (vestel 17pw15-8) and it has a few bulged caps but all voltages seem to be checking out ok. Sound is also still working.

    Checked fuse on the Tcon board and its fine.

    So to my question, can the faulty caps cause vertical lines? even though the voltages seem ok.

    The tv is a "DUAL 32 inch lcd", Never heard of that make until today.

    Any help would be great guys. Thanks
    Last edited by gilly1984; 09-25-2012, 01:49 PM.
    Do NOT touch heatsinks when testing for voltages as they may be LIVE!
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: Cad bad caps make vertical lines on the screen?

      Yeah, they can - you'll probably find that although the voltages appear OK, the ripple is through the roof, and this screws with the rest of the TV. I have had a similar problem on a TV caused by bad caps.
      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

        • gilly1984
          Badcaps Veteran
          • Jun 2012
          • 751
          • UK
          #3
          Re: Cad bad caps make vertical lines on the screen?

          Originally posted by tom66
          Yeah, they can - you'll probably find that although the voltages appear OK, the ripple is through the roof, and this screws with the rest of the TV. I have had a similar problem on a TV caused by bad caps.
          Cheers Tom,

          Update;

          Left the tv switched on with the back off and its now working?

          So am i right in thinking it is deffo the caps now.
          Do NOT touch heatsinks when testing for voltages as they may be LIVE!

            Comment

            • Pentium4
              CapXon Be Gone
              • Sep 2011
              • 3741
              • USA
              #4
              Re: Cad bad caps make vertical lines on the screen?

              You should recap it. Pictures are always welcome

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: Cad bad caps make vertical lines on the screen?

                  Originally posted by gilly1984
                  Cheers Tom,

                  Update;

                  Left the tv switched on with the back off and its now working?

                  So am i right in thinking it is deffo the caps now.
                  Yes as caps warm up their ESR can fall and they can start working better. Thus the TV may start working. That's a pretty clear sign that the caps are the issue.
                  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

                    • gilly1984
                      Badcaps Veteran
                      • Jun 2012
                      • 751
                      • UK
                      #6
                      Re: Cad bad caps make vertical lines on the screen?

                      Originally posted by tom66
                      Yes as caps warm up their ESR can fall and they can start working better. Thus the TV may start working. That's a pretty clear sign that the caps are the issue.
                      If it does the same thing tomoz after being off over night i will stick some pics up, i will also get some caps ordered and show you the before pics of the power board.

                      Thanks again.
                      Do NOT touch heatsinks when testing for voltages as they may be LIVE!

                        Comment

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