LN46A650 problem

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  • truep
    Badcaps Veteran
    • Aug 2010
    • 373
    • USA

    #1

    LN46A650 problem

    The problem is as follows:
    ran for 8 hours with the back off. All caps look fine but I have ordered replacements for the power supply. All voltages are stable.

    Today I put the back on. It ran for 3 hours then the screen went black. Backlights are on and sound is fine. I turned it off and imediately turned it on again and it came up fine.

    Sound like a tcon heat problem?
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: LN46A650 problem

    Get a can of freeze spray or a can of air duster using it up side down to cool the T-CON board, at the same time monitor the voltage on the SMD fuse on the T-CON to see if the voltage goes away.
    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

    • truep
      Badcaps Veteran
      • Aug 2010
      • 373
      • USA

      #3
      Re: LN46A650 problem

      The problem will be the shield around the TCON. It's used as a heat sink so I don't want to run it with the shield off. I'll try it tomorrow with the sheield on. The tcon does get very hot. I'll try heating the main board too just in case.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: LN46A650 problem

        You could rip heatsinks off old motherboards and leave the shield off. They will work better anyway.
        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

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: LN46A650 problem

          Does the shield actually make contact with the ICs, or has any heat transfer pads?
          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

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: LN46A650 problem

            I have worked on the LE40A656 twice which is the same TV, but UK version, and the frame is used as a heatsink. I have had once case of overheating chip on the T-con.
            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

            • truep
              Badcaps Veteran
              • Aug 2010
              • 373
              • USA

              #7
              Re: LN46A650 problem

              There is a heat transfer pad. The set runs fine with the back off (10 hours) so it's a heat problem.
              The only thing on the set that gets hotter than warm is the TCON.

              Comment

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