Vizio E421VA Need help

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  • TJV
    New Member
    • May 2013
    • 5
    • USA
    #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
    • mcross
      Badcaps Veteran
      • Sep 2011
      • 201
      • USA
      #2
      Re: Vizio E421VA Need help

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

        Comment

        • TJV
          New Member
          • May 2013
          • 5
          • USA
          #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

            • 1beertap
              Badcaps Veteran
              • Mar 2009
              • 219
              • USA
              #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.

                Comment

                • TJV
                  New Member
                  • May 2013
                  • 5
                  • USA
                  #5
                  Re: Vizio E421VA Need help

                  Thanks I'll try that tonight.
                  TJV

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA
                      #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

                        • TJV
                          New Member
                          • May 2013
                          • 5
                          • USA
                          #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

                            • TJV
                              New Member
                              • May 2013
                              • 5
                              • USA
                              #8
                              Re: Vizio E421VA Need help

                              Originally posted by budm
                              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

                                Comment

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