Sony KDL-37L4000

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  • kevinm34232
    Badcaps Legend
    • May 2012
    • 1884
    • USA

    #1

    Sony KDL-37L4000

    Hi someone called me with this TV, picture looks like contrast is turned way up similar to a Toshiba I had with wrong main board. Nothing has been worked on with this TV as of yet. Just curious if anyone has any experience with Sony's and this problem?
    Attached Files
  • kevinm34232
    Badcaps Legend
    • May 2012
    • 1884
    • USA

    #2
    Re: Sony KDL-37L4000

    I reflowed the main board in the oven, cleaned the LVDS connections, and there was no change. Im thinking it is a bad main board, can a t-con cause this issue though?
    Last edited by kevinm34232; 03-03-2013, 11:16 AM.

    Comment

    • drpj23
      Badcaps Veteran
      • May 2012
      • 528
      • USA

      #3
      Re: Sony KDL-37L4000

      What does the OSD look like? I have a M4000 with pic issues (image just has whites/yellows/reds/ and black), I am thinking this is a main too.

      Comment

      • kevinm34232
        Badcaps Legend
        • May 2012
        • 1884
        • USA

        #4
        Re: Sony KDL-37L4000

        OSD looks OK but still not right, it's just not as noticeable. The color is off. I tried a factory reset and got into the factory menu but nothing has helped.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: Sony KDL-37L4000

          I'm thinking T-con personally though I wouldn't rule out the main board.
          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

          • kevinm34232
            Badcaps Legend
            • May 2012
            • 1884
            • USA

            #6
            Re: Sony KDL-37L4000

            Hmm Tom remember the Toshiba I got hat had the wrong main board put in for a different model panel? This is very similar to what it looks like, that's why I was thinking main board.. The parts are expensive and pretty rare I guess Ill try to see if I can find both and try each one..

            Comment

            • kevinm34232
              Badcaps Legend
              • May 2012
              • 1884
              • USA

              #7
              Re: Sony KDL-37L4000

              Well I got new main board today but same problem. So I put old main board in and started looking at t-con (AUO 5537T03C02).
              I froze the t-con board and plugged it in, and although most of the IC's defrosted pretty quickly, the one that went first was the one labeled AS15-U which closest datasheet I found was
              https://cdn.badcaps-static.com/pdfs/...61ea6520a5.pdf

              Tom I know you thought T-Con originally, I swear everytime I had an issue like this it turned out NOT to be T-Con and this time I decided to go with the main board, figures..

              Should this chip heat up normally, or could this be the culprit, description being:

              The EC5575 is a 14+1 channel voltage
              buffers that buffers reference voltage for
              gamma correction in a thin film transistor
              liquid crystal display (TFT LCD). This
              device incorporating a Vcom amplifier
              circuits, four rail to rail buffer amplifier
              circuits (the highest two stage and lowest
              two stage) and 10 buffer amplifiers circuits.
              The EC5575 is available in a space saving
              48-pin TQFP package, and the operating
              temperature is from –20°C to +85°C.

              T-con is expensive and hard to locate..
              Attached Files

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Sony KDL-37L4000

                That is common failure on T-CON board with AS15 IC.
                https://www.badcaps.net/forum/showth...mma#post304275

                https://www.badcaps.net/forum/showth...099#post304099
                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

                • kevinm34232
                  Badcaps Legend
                  • May 2012
                  • 1884
                  • USA

                  #9
                  Re: Sony KDL-37L4000

                  I saw that after searching that part # on here, thanks Bud. I ordered the part I will post back results..

                  Comment

                  • kevinm34232
                    Badcaps Legend
                    • May 2012
                    • 1884
                    • USA

                    #10
                    Re: Sony KDL-37L4000

                    Replaced the AS15-U IC today and that WAS the problem, TV is working with good color. Thanks!

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Sony KDL-37L4000

                      Great!, thanks for posting the repair feedback update.
                      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

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