Insignia NS-32L430A11 Backlight problems

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  • kevinm34232
    Badcaps Legend
    • May 2012
    • 1884
    • USA

    #1

    Insignia NS-32L430A11 Backlight problems

    backlight was shutting off after about 30 seconds of TV turning on. Found T401 was burned. Ordered a kit from shopjimmy, the transformer was slightly different part #, original 8TC00569. Replaced with 8TC00588.

    Then R721 and Q701/702 burned up. They were part of the kit, replaced them and they burned again.

    Is this transformer not compatible? All other parts are the same in the kit.
    Attached Files
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6642
    • Wales

    #2
    Re: Insignia NS-32L430A11 Backlight problems

    Have you checked that there is not a problem with the wiring from the transformer to the tube shorting to the case which may have been the cause of the original fault and also responsible for the second fault?
    Perhaps checking the CCFL connectors resistance.
    Have you checked the capacitors C40x
    Willing to help but I'm no expert.

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Insignia NS-32L430A11 Backlight problems

      It can be due to worn out lamps and drawing too much current from the transformer HV winding.
      Those little blue ballast caps are OK? No leakage resistance on them?
      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

        #4
        Re: Insignia NS-32L430A11 Backlight problems

        Is it weird that before, with the original transformer, it would stay on for 30+ secs, then shut off, never blowing any other components?

        Now it violently burns up the resistor smoke and flames!

        Comment

        • dick_barton
          Badcaps Legend
          • Aug 2015
          • 6642
          • Wales

          #5
          Re: Insignia NS-32L430A11 Backlight problems

          All I can think of is to compare the winding resistances and see if the replacement compares with a good transformer.
          Willing to help but I'm no expert.

          Comment

          • kevinm34232
            Badcaps Legend
            • May 2012
            • 1884
            • USA

            #6
            Re: Insignia NS-32L430A11 Backlight problems

            I got a new power/inverter board which works and now I can see a dark row where it looks like a bulb is out.. Bummer

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales

              #7
              Re: Insignia NS-32L430A11 Backlight problems

              That could be because the CCFL tube has slipped out of it's connectors.
              Willing to help but I'm no expert.

              Comment

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