LG 42PC3D 1 lane severed on Y Buffer ribbon

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  • Videojoe
    Member
    • Sep 2013
    • 47
    • Us
    #1

    LG 42PC3D 1 lane severed on Y Buffer ribbon

    Picked this up for $30 and a box of extra boards because this kid gave up on fixing it (red flag right there). Anyway, sound with no picture, blah blah. I read on here a hundred times, Y main and buffers. I replaced those and yes it fired right up with 1079 beautiful lines of HD video. However, I insist on all 1080 lines so I reseat the buffer cables a few time and still have one dead line. i notice now that the ribbon cable on the bottom is severed across one of the traces just about where the missing line is. I'm hoping this cable can be replaced or is this a deal breaker? Also have one black vertical line as you can see by the pics. Any advice, Godfathers of TV repair?
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    • capkid
      Badcaps Legend
      • Oct 2010
      • 1339
      • United States
      #2
      Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

      Here's a successful repair to the Y-buffer ribbon, but it's an extreme long shot: https://www.badcaps.net/forum/showth...=Ribbon&page=2

      The vertical lines point to a panel issue.
      LG Plasma Mal-Discharge Correction Service

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

          Just a note: this is a 1024x768, 720p TV. Not 1080p.
          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

            • freakaftr8
              Badcaps Legend
              • Oct 2012
              • 3743
              • USA
              #4
              Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

              Someone was careless when removing the ribbons from the y and x drivers.. Have you taken a magnifying glass and lookek for cracks or a broken line in the cables? Creases in the cables or the sort? I have had luck repairing this fault before fut its not easy. However I have also made matters worse on another set I tried to repair this fault on as well and shorted out the whole x driver IC.. If you cannot find the fault in the ribbons, sometimes its just not worth it.
              Did I leave the soldering iron on?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

                  That intersecting fault to me looks like one bad pixel has damaged the connection to the others.
                  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

                    • Videojoe
                      Member
                      • Sep 2013
                      • 47
                      • Us
                      #6
                      Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

                      Finally got my buddy over here who is an expert soldered and he rigged up a microscope on the damaged ribbon, scraped the insulation off 3 or 4 lanes of the ribbon. Then he soldered little wire jumpers across the damaged lanes. First he did one side and rtv'd down and let it cure for a day, then soldered the other side down and coated that with rtv. It took care to the horizontal lines but I still have one vertical line on the right hand side, black and 1 pixel thick from top to bottom. Re seated the cables all over the place many times but can't get rid of it. Don't tell me it's the panel after all this surgery.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG 42PC3D 1 lane severed on Y Buffer ribbon

                          Sorry, those lines look like panel to me...
                          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

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