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Vizio E421VA Need help

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    #1

    Vizio E421VA Need help

    I got this TV from a neighbor. It was manufactured in 2011. I have replaced the power supply. The original had 2 burnt resistors. It now has power at the 24 volt ,12 volt and 5 volt pins. The Vizio badge lights when I plug the power cord in. The badge goes to bright white when I turn on the power button. I am not getting anything on the screen or sound.
    I would like to know what route I need to take to diagnose this. I have a multimeter and have changed a few caps on another old vizio with success.
    Thanks
    In advance
    TJV
    Tags: None
    #2
    Re: Vizio E421VA Need help

    Vizio TVs are known for problems with the main board. I would start there

    Comment

      #3
      Re: Vizio E421VA Need help

      I have 2 main boards. I just plugged an hdmi cable in and got sound.
      I know the the tv was used on hdmi1 and I plugged in a cable off my laptop and got sound. I am not getting any backlighting.
      Any suggestions would be appreciated.
      TJV

      Comment

        #4
        Re: Vizio E421VA Need help

        While the tv is on with sound, take a flashlight and look closely at the screen to see if there is a faint picture. If so, you may have an inverter issue or a broken/bad ccfl. If not, check main board or replace it.

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          #5
          Re: Vizio E421VA Need help

          Thanks I'll try that tonight.
          TJV

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            #6
            Re: Vizio E421VA Need help

            Any good clear pictures of how all the boards are connected?
            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

              #7
              Re: Vizio E421VA Need help

              Here are some pics.
              I see the power supply is set up in tandom for inverters.
              When it was dark this morning I powered up the set and
              saw the right side back light try to fire for a half second.
              I then swapped the power feeds to see if the left would try to
              fire as well. It didn't. I swapped them back and right fired again.
              Wouldn't that mean the left ccfl was bad and shutting down the
              power supply?
              Thanks
              TJV





              http://s1278.photobucket.com/user/tjv2/library/

              Comment

                #8
                Re: Vizio E421VA Need help

                Originally posted by budm View Post
                Any good clear pictures of how all the boards are connected?
                That test with the florescent bulb is cool as it gets.

                The other will take me a few to digest.. lol
                Not giving up..
                Thanks TJV

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