Sony KDL-46EX400 startup issue

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  • tech2014
    Badcaps Veteran
    • Aug 2014
    • 807
    • Canada
    #1

    Sony KDL-46EX400 startup issue

    I have a Sony KDL-46EX400 that is acting strange. When you power it up, the backlight will come on for a second, along with a loud buzzing sound. It tries to turn on 3 times, then goes into standby. The LED flashes 6 times.In the service manual it indicates a backlight problem, and the possible cause it says LCD panel.

    When I remove the connections going from the power supply to the inverter board, the tv doesn't buzz anymore when trying to power up. It just tries turning on and chirps each time(rather then buzz), then goes into standby. Would this be a bad panel or inverter board? See pics below.





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    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: Sony KDL-46EX400 startup issue

      Bad panel how ? Also checked the secondary resistance of the little buffer transformers and the main one on the Psu for the backlights ?
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • tech2014
          Badcaps Veteran
          • Aug 2014
          • 807
          • Canada
          #3
          Re: Sony KDL-46EX400 startup issue

          It says possible cause for 6 led flashes is LCD panel in the service manual. I forgot to mention that there was a lightening strike and it took out a few of this guys appliances and other electronics.

          I will check the transformers and let you know what I find.
          Last edited by tech2014; 07-12-2016, 03:32 PM.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Sony KDL-46EX400 startup issue

              Please read the Training manual.
              6X Blink - Backlight System Failure (46” Models)
              The 46” models have both a 4X and 6X blink protection mode. The 4X blink will, in most cases, be caused by a defective lamp.
              Because all the Backlight HV Inverter circuits are located on the GD2-Board, a 6X blink protection mode will be fixed, in most cases, by replacing the GD2-Board. If the GD2-Board does not repair the problem replace the A-Board. The BL-ON and Dimmer signals come from the microprocessor on the A-Board. A shorted or open BL-ON signal will cause this 3X condition. Also a shorted Dimmer will cause this 3X condition.
              Attached Files
              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

                • tech2014
                  Badcaps Veteran
                  • Aug 2014
                  • 807
                  • Canada
                  #5
                  Re: Sony KDL-46EX400 startup issue

                  thanks budm.

                    Comment

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