VIZIO E550VL No Backlight

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  • CraigR
    Badcaps Veteran
    • Dec 2013
    • 959
    • USA

    #1

    VIZIO E550VL No Backlight

    I have a old Vizio E550VL with no backlight. I do have a picture when I use a light up to the screen. The fuses on the inverter boards are ok and I have 24volts at those fuses when turned on. Not sure on the next step.
    Attached Files
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: VIZIO E550VL No Backlight

    Next step is to check and find out if you have 24VDC at both ends of the SMD fuse on the inverter boards with ref to the chassis GND or not.
    If you do, the you will need to find out if you have BL-ON signal to the inverter board or not.
    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

    • CraigR
      Badcaps Veteran
      • Dec 2013
      • 959
      • USA

      #3
      Re: VIZIO E550VL No Backlight

      I do have 24v. However not seeing anyplace marked bl_on or I'm blind. I did see one marked ON/OFF on inverter and that only has .5v

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: VIZIO E550VL No Backlight

        Originally posted by CraigR
        I do have 24v. However not seeing anyplace marked bl_on or I'm blind. I did see one marked ON/OFF on inverter and that only has .5v
        ON/OFF on the inverter board is the same as BL-ON or INVR-ON.
        IF all you get is 0.50VDC when the TV is turned on then the main board is not sending the ON/OFF (BL-ON) to turn on the Backlights circuit.
        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

        • CraigR
          Badcaps Veteran
          • Dec 2013
          • 959
          • USA

          #5
          Re: VIZIO E550VL No Backlight

          Well ordered and tried a kit from Shopjimmy. http://www.shopjimmy.com/vizio-3655-...for-e550vl.htm
          But did not help at all.

          Comment

          • dick_barton
            Badcaps Legend
            • Aug 2015
            • 6642
            • Wales

            #6
            Re: VIZIO E550VL No Backlight

            Originally posted by CraigR
            Well ordered and tried a kit from Shopjimmy. http://www.shopjimmy.com/vizio-3655-...for-e550vl.htm
            But did not help at all.
            But were you getting the backlight on voltage as Budm advised because as he said it is provided by the main board?
            Willing to help but I'm no expert.

            Comment

            • CraigR
              Badcaps Veteran
              • Dec 2013
              • 959
              • USA

              #7
              Re: VIZIO E550VL No Backlight

              Still only .5v after chips change.

              Comment

              • CraigR
                Badcaps Veteran
                • Dec 2013
                • 959
                • USA

                #8
                Re: VIZIO E550VL No Backlight

                Replaced the main board and is working again.

                Comment

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