Sony Bravia KDL-40EX403

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  • finntricky
    Badcaps Veteran
    • Jan 2014
    • 449
    • uk

    #1

    Sony Bravia KDL-40EX403

    Ok guys, got this tv in with stand by light flashing 7 times and then repeating, done a bit of reading and found out that main board was faulty,
    replaced the board with another and now get solid stand by, but when i turn it on, the green and amber lights flash together non stop,
    i did read somewhere on here about the problem and it was 2 mosfets and a fuse-able resistor that was replaced and solved the problem, so i checked this out and mine are fine.
    im also getting 24v at the inverter as well, but back light are not turning on,
    i need some help on where to go now, as power board volts all seem ok ?
    ill get some pics up ASAP.
  • finntricky
    Badcaps Veteran
    • Jan 2014
    • 449
    • uk

    #2
    Re: Sony Bravia KDL-40EX403

    quick update, rechecked volts and jumped the standby and power on, now got back lights,
    it would seem that i have been sold another faulty main board,
    or have i ?, i have no volts for the T=CON on, from power supply

    Comment

    • finntricky
      Badcaps Veteran
      • Jan 2014
      • 449
      • uk

      #3
      Re: Sony Bravia KDL-40EX403

      some pics
      Attached Files

      Comment

      • CapLeaker
        Leaking Member
        • Dec 2014
        • 7976
        • Canada

        #4
        Re: Sony Bravia KDL-40EX403

        We need the voltages with the corresponding pin outs. Maybe one with everything attached to the PSU, the other only the PSU by itself forced on. There is a Tcon on pin and a TCon power. So in order to get Tcon power, you have to turn it on, like PSon and BLon.
        Last edited by CapLeaker; 09-20-2016, 07:07 AM.

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: Sony Bravia KDL-40EX403

          May also be worth checking those orange looking resistors which I believe are fuses.
          Willing to help but I'm no expert.

          Comment

          • finntricky
            Badcaps Veteran
            • Jan 2014
            • 449
            • uk

            #6
            Re: Sony Bravia KDL-40EX403

            hope you can understand these,
            pic 1 is in stand by., pic 2 is turned on with flashing green and amber lights,,
            pic 3 is power supply jumped on, pic 4 is pic 1 and 2 together.

            as you can see, im already getting the power on signal from the main board while in stand by.
            Attached Files
            Last edited by finntricky; 09-21-2016, 06:14 AM.

            Comment

            • flocko
              Badcaps Legend
              • Nov 2012
              • 1121
              • uk

              #7
              Re: Sony Bravia KDL-40EX403

              The main boards on these Sony set are awash with SMD fuses on the front and rear , I would carefully check these first,and use a marker to mark the ones as you go

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Sony Bravia KDL-40EX403

                Originally posted by flocko
                The main boards on these Sony set are awash with SMD fuses on the front and rear , I would carefully check these first,and use a marker to mark the ones as you go
                And they are VERY SMALL and hard to see.
                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

                • finntricky
                  Badcaps Veteran
                  • Jan 2014
                  • 449
                  • uk

                  #9
                  Re: Sony Bravia KDL-40EX403

                  UPDATE,
                  got a full refund on the main board i got from EBAY, have'nt even got to send it back, RESULT, and have ordered another one, just have to wait and see,

                  Comment

                  • Davi.p
                    Badcaps Legend
                    • Sep 2009
                    • 4265
                    • Italy - Milan

                    #10
                    Re: Sony Bravia KDL-40EX403

                    Why don't you try to repair the original one in the meantime? Wich research have you got on it? Only manuals&internet searches?

                    Comment

                    • finntricky
                      Badcaps Veteran
                      • Jan 2014
                      • 449
                      • uk

                      #11
                      Re: Sony Bravia KDL-40EX403

                      when it comes to main boards, i lose interest and give up, so trying to repair is not for me.

                      Comment

                      • CapLeaker
                        Leaking Member
                        • Dec 2014
                        • 7976
                        • Canada

                        #12
                        Re: Sony Bravia KDL-40EX403

                        Originally posted by finntricky
                        hope you can understand these,
                        pic 1 is in stand by., pic 2 is turned on with flashing green and amber lights,,
                        pic 3 is power supply jumped on, pic 4 is pic 1 and 2 together.

                        as you can see, im already getting the power on signal from the main board while in stand by.
                        Mainboard isn't sending BLon.

                        Comment

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