Sony KDL-75W850C Issues

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  • blake.s
    Senior Member
    • Jan 2018
    • 123
    • United States
    #1

    Sony KDL-75W850C Issues

    I have a Sony KDL-75W850C that when powered on it blinks the backlights and then turns off. After a couple seconds it will then go into the led blink mode and will blink 6 times. I took off the back and the power board clicks on when powered on and then clicks off after a couple of minutes. I have seen where this could be backlights but is there a possibility that the powerboard or main board could be bad?

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    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales
      #2
      Re: Sony KDL-75W850C Issues

      Check your led voltages at the led connecter at switch on and see if they peak then drop before the power supply switches off.
      Willing to help but I'm no expert.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Sony KDL-75W850C Issues

          Originally posted by dick_barton
          Check your led voltages at the led connecter at switch on and see if they peak then drop before the power supply switches off.
          +1
          You need to put all connectors back in place, then keep black probe on the chassis and then Red probe on each pins of the LED connector, since you have 4 LED strings, then you will have to preform the test 8 times when turning on the TV on while watching the meter.
          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

            • chrismurphy
              Badcaps Veteran
              • May 2014
              • 251
              • australia
              #4
              Re: Sony KDL-75W850C Issues

              Had a few of these, sorry your Backlights have failed
              Have two a present ,one with a cracked screen but good backlights and one with good screen with faulty backlights
              but haven't got around to fixing as i dont know if its worth it
              Anyone here removed a screen form one of these
              Done heaps of 50 and 60 inch but not 75

                Comment

                • brucetv
                  Badcaps Veteran
                  • May 2015
                  • 281
                  • united states
                  #5
                  Re: Sony KDL-75W850C Issues

                  This model is notorious for bad backlights. The panel has white two way adhesive tape holding it down into the panel trim so you have to break that panel away from the bezel before you pull it or you will damage it. The new strip kits are hard to find but the rest of the exchange is pretty easy.

                    Comment

                    • Davi.p
                      Hobbist Tech
                      • Sep 2009
                      • 4326
                      • Italy - Milan
                      #6
                      Re: Sony KDL-75W850C Issues

                      If fix goes well place a varistor to protect leds output, not tried but worth a try..

                        Comment

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