samsung ln40a500t1f, tv turns on, inverter shuts off

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  • mattstolte
    Badcaps Veteran
    • Dec 2013
    • 612
    • usa

    #1

    samsung ln40a500t1f, tv turns on, inverter shuts off

    so I got this tv in, and soon as I power on the tv lights up 1 sec then lights turn off but tv stays on, so I did the flashlight test and I still see the picture when I press menu, so I bought a used inverter off ebay and still same thing, so what could it be?
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: samsung ln40a500t1f, tv turns on, inverter shuts off

    Pictures, pictures, pictures.
    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

    • mattstolte
      Badcaps Veteran
      • Dec 2013
      • 612
      • usa

      #3
      Re: samsung ln40a500t1f, tv turns on, inverter shuts off

      Attached Files

      Comment

      • R_J
        Badcaps Legend
        • Jun 2012
        • 9515
        • Canada

        #4
        Re: samsung ln40a500t1f, tv turns on, inverter shuts off

        You could have one bad ccfl, it only takes one to be bad to not work. I would check each one, unplug all of them and try each one on its own and see if it lights.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: samsung ln40a500t1f, tv turns on, inverter shuts off

          OK, this TV use balancer board to drive the lamps. There is small connector on toward the top of the board, there should be some labels like FB, LD, etc. We need the voltage reading on the LD pin. There are some more things to check on the balancer board also, it can be bad lamp.
          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

          • mattstolte
            Badcaps Veteran
            • Dec 2013
            • 612
            • usa

            #6
            Re: samsung ln40a500t1f, tv turns on, inverter shuts off

            Originally posted by budm
            OK, this TV use balancer board to drive the lamps. There is small connector on toward the top of the board, there should be some labels like FB, LD, etc. We need the voltage reading on the LD pin. There are some more things to check on the balancer board also, it can be bad lamp.
            Is it possible its a bad main? The dim pin goes up once powered up then after inverter goes off then dim voltage goes all the way back down, plus there is no samsung melody noise when powered on or off like all samsungs have right?

            Comment

            • Alastair E
              Chief Womble
              • Mar 2013
              • 1963
              • U.K.

              #7
              Re: samsung ln40a500t1f, tv turns on, inverter shuts off

              More likely a CCFL tube gone than a mainboard issue. Did you know--You can turn that Annoying 'melody' off in the menus!
              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

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: samsung ln40a500t1f, tv turns on, inverter shuts off

                What is the P/N of that power supply/inverte board combo? BN44-XXXXX?
                How about the post 5 I ask for the voltage readings?
                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

                • audiofreak19
                  Badcaps Veteran
                  • Apr 2013
                  • 556
                  • usa

                  #9
                  Re: samsung ln40a500t1f, tv turns on, inverter shuts off

                  It's a ccfl bulb I had a samsung just like this one and did the same thing. If you take the screen out and turn the tv on you will see the back light turn on and you will see which ccfl bulb is bad.

                  Comment

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