LE37R87BD T.Con gamma fault ?

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  • flocko
    Badcaps Legend
    • Nov 2012
    • 1121
    • uk

    #1

    LE37R87BD T.Con gamma fault ?

    I have this set with very dark screen fault, full bright colour as if the backlight was turned down,it runs the T370XW02.V5.CB T.Con with the AS15 gamma chip have tested the gammer test points 1-20 and voltages ramp down Ok but they dont look to be high enough starting on T.P 1 at 7.79v and ending on T.P 20 at 1.69v,have seen other test on these boards show a lot higher voltages? it is showing 12.5v at the 12.0v test point. before i try a new board has anyone any suggestions thanks Flocko
  • flocko
    Badcaps Legend
    • Nov 2012
    • 1121
    • uk

    #2
    Re: LE37R87BD T.Con gamma fault ?

    I put a new AS15-F Gamma chip on the T.con and the set is now running fine, so even with a good voltage ramp down on the gamma test points, low starting voltage on t.p 1 was 7.79v and is now show at 15.04v and ramps down to 1.89 v on T.P 22with the new chip.
    Flocko

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: LE37R87BD T.Con gamma fault ?

      Thanks for info on your observation about the voltage readings? Where did you get the IC from? I have some problem when I buy 5 at a time, they're not all good, looking for reliable sources. Thanks.
      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

      • flocko
        Badcaps Legend
        • Nov 2012
        • 1121
        • uk

        #4
        Re: LE37R87BD T.Con gamma fault ?

        Hi Budm I got it off a guy on ebay sells a lot of them but he is in Uk and I think with postage came out at under £2.50, would think he gets them from China.I see you can get ten for £11.00 with free post from there, thinking of getting some from there as this one was the second one this month I have had to changed Flocko

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: LE37R87BD T.Con gamma fault ?

          I buy 5 (afraid to buy 10) at a time from Ebay (Chinese sellers) and get 4 out of 5 or 3 out off 5 that are good. So let me know if you run into any bad one from the same seller in the future repair.
          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

          • flocko
            Badcaps Legend
            • Nov 2012
            • 1121
            • uk

            #6
            Re: LE37R87BD T.Con gamma fault ?

            just ordered ten 15-f from China £11, bets are on that I will need 15-G or U when they get here, be my luck Flocko

            Comment

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