Samsung PN50A450 Horizontal Lines - Photo!

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  • Imago
    New Member
    • Jan 2016
    • 5
    • Canada
    #1

    Samsung PN50A450 Horizontal Lines - Photo!

    Happy New Year to all!

    My first post here...

    I inherited a big old Samsung 50" plasma tv with a number of black horizontal lines across the top of the screen as you can see in the attached photo. I've cleaned and re-connected the cables, and there are no obvious blown capacitors. The problem remains the same.

    The Y-buffer board is HUGE, running the entire way down the left side of the TV. Part number LJ41-05986A Rev 1.0, which I think MIGHT be the culprit.

    I'm pretty handy with a voltage meter... any thoughts on how to proceed with diagnostics?

    Like most, I realize it's an old 720p TV that I don't want to drop a lot of coin into, but it seems a shame to haul it to the recycler just yet!
    Attached Files
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    • Alastair E
      Chief Womble
      • Mar 2013
      • 1963
      • U.K.
      #2
      Re: Samsung PN50A450 Horizontal Lines - Photo!

      Could be the buffers--More likely the panel/tabs
      TELEFIX

      How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
      http://www.irf.com/technical-info/appnotes/an-1088.pdf
      PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain
          #3
          Re: Samsung PN50A450 Horizontal Lines - Photo!

          I say Panel common issue on these.
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

            Comment

            • paulstef
              Badcaps Veteran
              • Dec 2013
              • 724
              • Canada
              #4
              Re: Samsung PN50A450 Horizontal Lines - Photo!

              Try to slightly bend the screen with both hands, one on each upper corner, does it change ? Also may try this:https://www.youtube.com/watch?v=51SZsfH60EY

                Comment

                • Imago
                  New Member
                  • Jan 2016
                  • 5
                  • Canada
                  #5
                  Re: Samsung PN50A450 Horizontal Lines - Photo!

                  Originally posted by paulstef
                  Try to slightly bend the screen with both hands, one on each upper corner, does it change ? Also may try this:https://www.youtube.com/watch?v=51SZsfH60EY
                  No change when I twist the screen.

                  I also checked for a ground to pins short as in the video you provided, and there don't seem to be any. I think I was doing it correctly, however the pins on the right side of the y-buffer board are much smaller than in the video. I've attached a photo of my board. The red arrow is where I placed the negative probe, (in the centre of the pins) and the yellow arrows are the pins I checked, (dragged the positive probe down both sides). No shorts.

                  Unless anyone can think of something else, I think the lines are caused by a bad panel.

                  Thoughts? Anything left to try?
                  Attached Files

                    Comment

                    • Imago
                      New Member
                      • Jan 2016
                      • 5
                      • Canada
                      #6
                      Re: Samsung PN50A450 Horizontal Lines - Photo!

                      Originally posted by Imago
                      No change when I twist the screen.

                      I also checked for a ground to pins short as in the video you provided, and there don't seem to be any. I think I was doing it correctly, however the pins on the right side of the y-buffer board are much smaller than in the video. I've attached a photo of my board. The red arrow is where I placed the negative probe, (in the centre of the pins) and the yellow arrows are the pins I checked, (dragged the positive probe down both sides). No shorts.

                      Unless anyone can think of something else, I think the lines are caused by a bad panel.

                      Thoughts? Anything left to try?
                      Bump.

                        Comment

                        • rccrasher65
                          Badcaps Veteran
                          • Mar 2014
                          • 625
                          • United States
                          #7
                          Re: Samsung PN50A450 Horizontal Lines - Photo!

                          Bad plasma panel.

                            Comment

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