Vizio gv47l fhdtv10a

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  • PotShotScott
    Member
    • Feb 2007
    • 40
    #1

    Vizio gv47l fhdtv10a

    I have a Vizio GV47L with the master/slave inverter boards. The TV powers on, audio works but no backlight/video. I have 24VDC, grounds and the 3.3 and 5V line present at the master inverter. Both inverters had bad 680uF 35V caps that I replaced. I've read the thread here -> https://www.badcaps.net/forum/showthread.php?t=37666

    The voltage regulators I've looked at all seem fine. Any ideas on why the inverters don't turn on? Looks like they should given the 3.3V and 5V present there.

    Any experts on this unit?
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Vizio gv47l fhdtv10a

      It needs the BL-ON (or INV-ON/OFF) command signal (<1VDC = OFF, >2VDC = ON from the main board for the inverter circuit to come on.
      Best to post good clear pictures of the inverter board and the whole backside of the TV showing all the boards.
      Last edited by budm; 12-06-2017, 10:57 PM.
      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

        • PotShotScott
          Member
          • Feb 2007
          • 40
          #3
          Re: Vizio gv47l fhdtv10a

          Thanks for the response. I am posting pics of my boards. The inverter has the power connection and a ribbon cable. I have not chased the ribbon cable back but it appears to be a low voltage/current data line to the slave inverter.
          Attached Files

            Comment

            • PotShotScott
              Member
              • Feb 2007
              • 40
              #4
              Re: Vizio gv47l fhdtv10a

              Wow - thanks for the additional motivation here. Not sure why I didn't figure this out earlier the 10 ampere surface mount fuse on the master inverter failed as well. Bypassed it with a simple clip and the backlights came right on. Appreciate the nudge to take photos. Feeling a little silly now.

                Comment

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