Samsung LA40A550P1FXXY Backlight Working but no Picture

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  • Begbie
    Member
    • Oct 2013
    • 16
    • Australia
    #1

    Samsung LA40A550P1FXXY Backlight Working but no Picture

    This one was working fine after a PS capacitor fix until now, it is booting up OK but no picture on screen. Sound is good and so is the backlight. Where should I be looking next?

    Oh and I know the pictures show the TCon unplugged but this is not the fault







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    • aaronwt6
      Badcaps Veteran
      • Apr 2013
      • 855
      • US
      #2
      Re: Samsung LA40A550P1FXXY Backlight Working but no Picture

      I'm betting T-con. I actually just replaced that exact T-con in a similar 40" Samsung with the same issue. Turned on, had sound, inputs and backlight worked, but no picture whatsoever.

      (Oh, and this was the 2nd of these that I've done with the same problem on that T-con)

        Comment

        • Dang
          Badcaps Veteran
          • Aug 2013
          • 440
          • UK
          #3
          Re: Samsung LA40A550P1FXXY Backlight Working but no Picture

          Get your DMM out and check the fuse on Tcon board, see if it shows open.

            Comment

            • Begbie
              Member
              • Oct 2013
              • 16
              • Australia
              #4
              Re: Samsung LA40A550P1FXXY Backlight Working but no Picture

              Wow talk about a long time between drinks. I ordered a new Tcon and replaced it, Same result. I tested the fuse on both old and new Tcons and found them both open. I dont know if the one on the new board was good before i installed it though.

              How hard is it to find and fit a replacement fuse?

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Samsung LA40A550P1FXXY Backlight Working but no Picture

                  It can be that you have shorted components on the panel that cause the new T-CON board to low the fuse.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • aaronwt6
                      Badcaps Veteran
                      • Apr 2013
                      • 855
                      • US
                      #6
                      Re: Samsung LA40A550P1FXXY Backlight Working but no Picture

                      I wouldn't be surprised if you received a faulty t-con for the replacement either. I've had plenty myself.

                        Comment

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