Vizio 470va have backlight but no picture

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  • bvcrimson
    New Member
    • Jul 2014
    • 5
    • usa
    #1

    Vizio 470va have backlight but no picture

    Hi all!
    I originally found this site trying to help the maintenance guy at work fix the tv in our break room. The big wigs decided to buy a new tv and I was allowed to have the broken one.

    When I turn the tv on, I get a backlight and the white vizio logo and no picture. Sound is working.

    From what I've found on the internet it looks like the mainboard's go bad in these tv's pretty regularly. Does this sound like what I'm running into?

    Pictures to follow...
    Tags: None
    • bvcrimson
      New Member
      • Jul 2014
      • 5
      • usa
      #2
      Re: Vizio 470va have backlight but no picture

      Sorry if pics aren't that great. I only have a 5.5mp phone camera.
      The wife is out of town with the good camera.
      Attached Files

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: Vizio 470va have backlight but no picture

          You need to check the fuse (TV unplugged) and the DC voltage (TV on) at both ends of the fuse on the T-CON board (the board in the center bottom under the metal shield wit two flat cables to the LCD panel).
          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

            • bvcrimson
              New Member
              • Jul 2014
              • 5
              • usa
              #4
              Re: Vizio 470va have backlight but no picture

              Is this the fuse? If so, there is no power measured there.
              Attached Files
              Last edited by bvcrimson; 07-31-2014, 08:52 PM.

                Comment

                • bvcrimson
                  New Member
                  • Jul 2014
                  • 5
                  • usa
                  #5
                  Re: Vizio 470va have backlight but no picture

                  I checked again with a different tester and there is still no voltage at either side of the fuse.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #6
                      Re: Vizio 470va have backlight but no picture

                      FB is the Ferrite Bead, you will have to remove the shield to see what are under the shield.
                      I am not sure if the B+ is fed to that ferrite bead 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

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