Dead Vizio VO320E

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  • islandguy5
    New Member
    • Nov 2021
    • 4
    • US
    #1

    Dead Vizio VO320E

    Good morning techs. Need some help. I have been in electronics for over 50 years but as you know it changes fast and left me behind.
    I have a Visio VO320E that is completely dead. I know it is old but if possible I would like to repair it to component level. I have located a few components that are bad and have ordered them from somewhere on the planet.
    I have circled the components that are bad. Two FETS and one Thermal resistor.
    I assume this has something to do with the display in some way. Any help would be great.
    Attached Files
    Last edited by SMDFlea; 11-15-2021, 09:12 PM. Reason: VO320E
    Tags: None
    • lotas
      Badcaps Legend
      • Jan 2016
      • 4457
      • Russia
      #2
      Re: Dead Vizio

      They are in the backlight inverter.

        Comment

        • islandguy5
          New Member
          • Nov 2021
          • 4
          • US
          #3
          Re: Dead Vizio

          Originally posted by lotas
          They are in the backlight inverter.
          An inverter takes DC and makes AC. So you need AC to run the back light is that correct? These FETs are gated by the AC?

            Comment

            • lotas
              Badcaps Legend
              • Jan 2016
              • 4457
              • Russia
              #4
              Re: Dead Vizio

              They power high voltage transformers
              Attached Files

                Comment

                • islandguy5
                  New Member
                  • Nov 2021
                  • 4
                  • US
                  #5
                  Re: Dead Vizio

                  Originally posted by lotas
                  They power high voltage transformers
                  Thanks for your response. Are they the two larger flat transformers on the power board? If so might one be defective, causing the fets to go? Where might I get some information on this circuit.

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa
                      #6
                      Re: Dead Vizio VO320E

                      Your backlights are fluorescent tubes. You will probably have to compare resistance between each of the transformers.
                      I assume no responsibility for any stupid suggestions I might post.

                        Comment

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