Question about Vizio 42 in. LCD TV

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Vizio 42" powers up and vizio turns white, back light on but no on screen displays and no sound or picture from any input. only way to turn off is to unplug power. Tech support narrows it to the main board OR logic board. Any guesses as to which one??? Also has anyone ever had 110VAC on heat sink of power board???

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  • mjflips_2 Nov 16, 2009

    No problems with power board. Model #VU42LFHDTV10A testing shows logic board is for HD functions and main board handles processing, inputs and on screen displays, but nothing showing signs of anything bad visually. Main Board 3642-0122-0150(4A) is the OEM replacement 3642-0122-395R?? Also just a question, service port for this is a RJ45, is it possible to terminal into this and run service diag. with PC as dumb terminal??

  • mjflips_2 Nov 16, 2009

    just to clarify logic board not main board???

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Hi

Thanks for using FixYa. This is happening due to the power board or the X-sus board. However, this usually happens due to the Power board. You'll need to disassemble the TV to be sure where exactly the issue is. If its the power board, then you'll be able to see swollen/bulged capacitors on the board.
However, if its a X-sus (logic board) then you'll need to check the connector cables connected to it and also the components connected on the board. You'll need a multimeter to check these things out.

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee

Posted on Nov 15, 2009

  • Rylee Smith
    Rylee Smith Nov 16, 2009

    Hi




    If its not the power board then definetly the issue is with the X-sus board (logic/video display board). And you can't judge a bad board or component by just looking at it. You'll need a multimeter to check all the boards and components.


    You'll need service diagnostic kit to attach it with the RJ45 connector and also the know-how of the kit.


    Please do accept the solution if the issue is resolved or else revert for further assistance.

    Thanks
    Rylee

  • Rylee Smith
    Rylee Smith Nov 16, 2009

    Yes, I mean X-SUS Board/Video Board.


    Please do accept the solution if the issue is resolved or else revert for further assistance.

    Thanks


    Rylee

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