Vizio E421VA flickering backlight when powered on

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  • Lazarus65
    New Member
    • Jul 2017
    • 5
    • USA
    #1

    Vizio E421VA flickering backlight when powered on

    When I power on the TV it flickers rapidly for several seconds then the screen goes blank. The lights are still on but there is nothing on the screen. No menu or information. I have checked all the boards and the only thing that appears to be faulty is a thermistor. I have tested the power board and all the correct voltages are there. From the other threads on here it appears to be the main board voltage regulators. Nobody on those threads have confirmed that fixed the problem. How do I test these?
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    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: Vizio E421VA flickering backlight when powered on

      Some good pictures would be helpful
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • Lazarus65
          New Member
          • Jul 2017
          • 5
          • USA
          #3
          Re: Vizio E421VA flickering backlight when powered on

          Originally posted by dskall
          Some good pictures would be helpful
          I have added a picture of the mainboard. The thermistor just had a bit of old gunky flux that was easily scraped off. Research from other posts suggests the mainboard to be faulty. ShopJimmy appears to be sold out of this model mainboard and the mainboard kits don't show my same model number.
          Attached Files

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            • Lazarus65
              New Member
              • Jul 2017
              • 5
              • USA
              #4
              Re: Vizio E421VA flickering backlight when powered on

              Any ideas on where to find parts for this main board? Here is the model and board number: CBPFTXACB5K008 (TXACB5K00808)

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