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Vizio SV420XVT1A issues.

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    Vizio SV420XVT1A issues.

    Hey all

    Been awhile since I have posted, TV repair has been on hold for me since other things have taken over.

    I am trying to finish up some back stock I have left.

    Anyway I have 2 of these panels, and both of them are doing the same exact thing.

    When powered on the panel functions perfectly fine and in (about 10-30 min later give or take) the display becomes corrupt, audio cuts out, starts squealing, pink noise ect and the buttons/remote become un responsive and the unit has to be unplugged.

    After I unplug it and plug it back in it will function 100% fine and the issue will not comeback unless the panel has been powered off for a while.


    I am guessing it is a bad mainboard/EEPROM but the mainboard version I have in both of these panels is the one that cannot be changed (talk about luck).

    So I assume I will need a new mainboard, but has anyone experienced similar issues with these series of Vizio panels? I would like to find out how to prevent this from happening again.

    I know vizio likes to encase their mainboards behind a stupid metal box/shield that traps heat like crazy, I am working if I drill some more vent holes in the top of that would help keep the heat off the main.

    Anyway, all the voltages are correct, nothing seems off about them, I did not get to a component level but the SMPS, CCFL inverter and standby and power voltages were all present.

    thanks!
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    #2
    Re: Vizio SV420XVT1A issues.

    Have you checked voltage regulations on mainboard?

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      #3
      Re: Vizio SV420XVT1A issues.

      Sounds heat related.

      1) try heating up the mainboard and tcon boards with a hair dryer to see if you can quicken the screen corruption.

      2) after screen corruption, are the power supply output voltages still good?
      Last edited by jetadm123; 09-25-2015, 05:56 PM.

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