Samsung LE40M87BD Panel gone ? Half screen weird colours

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  • noledud
    Badcaps Veteran
    • Dec 2013
    • 413
    • united kingdom

    #1

    Samsung LE40M87BD Panel gone ? Half screen weird colours

    Hi all

    just wanted to confirm the panel is bad

    no gamma chip on this tcon
    Attached Files
  • Andrew F. Ali
    Badcaps Legend
    • Jan 2014
    • 2450
    • Trinidad & Tobago

    #2
    Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

    Could be CCFLs with weak/burning ends??

    Comment

    • noledud
      Badcaps Veteran
      • Dec 2013
      • 413
      • united kingdom

      #3
      Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

      strange turned it off for a bit to write original post then when i went back to it got this

      im thinking its tab bonds as it seems to change with twisting
      Attached Files

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

        Bad panel, tab bonds.
        May or may not be fixable. Fix is rarely permanent.
        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

        • noledud
          Badcaps Veteran
          • Dec 2013
          • 413
          • united kingdom

          #5
          Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

          hum this is strange iv stripped it down and nothing changes when i press the tabs

          if it was a tab bond issue then surly i must notice a change when i prod them ?

          or is that just me and wishfull thinking

          Comment

          • noledud
            Badcaps Veteran
            • Dec 2013
            • 413
            • united kingdom

            #6
            Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

            and none of the tab are getting hot all excatly the same good side and bad side ?

            Comment

            • Shinju
              Badcaps Legend
              • Mar 2014
              • 1239
              • USA

              #7
              Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

              Apply gentle pressure to the IC on the tab, be very carful not to crack the IC in the ribbon.

              Also this might be separation from the ribbon to the TFT glass its self, you can gently apply pressure were it connects with a toothpick.

              Comment

              • SteveNielsen
                Retired Tech
                • Jun 2012
                • 2327
                • USA

                #8
                Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

                Check the ribbon cables?

                Comment

                • noledud
                  Badcaps Veteran
                  • Dec 2013
                  • 413
                  • united kingdom

                  #9
                  Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

                  checked cables and also swapped tried pressing tab ic's and all sorts at no point can i change the screen, it goes normal again for a time with just some ghosting on the very far edge then back to half the screen with wired colours

                  i really think its tabs but cant figure out why i cant effect the picture with pushing

                  also when i turn on the tv or change source the picture takes a while to spread to the edge of the screen, how do i upload a video to show you ?

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

                    This is a textbook case of a gate driver failure. (Panel.) The fading symptom is very common. If pressure does not change it (only light pressure should be necessary) I don't think it will be fixable.
                    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

                    • noledud
                      Badcaps Veteran
                      • Dec 2013
                      • 413
                      • united kingdom

                      #11
                      Re: Samsung LE40M87BD Panel gone ? Half screen weird colours

                      Hi iv copied a video of the strange screen charging

                      https://www.dropbox.com/s/ps0z3tpahq..._2332.MOV?dl=0

                      Comment

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