Question about Vizio L32 32 in. LCD HDTV

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42" Vizio Power supply board output voltage?

Hi,
I am trying to repair a Vizio 42" LCD HDTV, There is power going into the power supply board, but only 5 vdc coming out of one of the connectors. There are 12vdc and or 24 vdc coming off the power supply board.

The TV will be in stand by mode, but can not be turned on by either the power button or remote.

Ordered a refurb power supply and installed it with the same results.

Any Guru's out there have any other suggestions?
Even with all connectors out of the power supply board (Except the A/C), only have the 5 vdc coming out of the board.

From other post, someone suggested the Main board, but if the power supply voltages aren't there, then why would you consider a main board problem.

Thanks in advance.
Mac

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  • Mac Gyver Jul 30, 2009

    Correction to the above post. I am NOT getting any 12vdc or 24 vdc coming off the power supply board.

  • Mac Gyver Jul 30, 2009

    Correction to the above post. There are NO 12vdc or 24vdc coming off the power supply board. Only the 5vdc is coming off the board.


    Does anyone know if the main board switches the 12 and 24 volts off of the power supply board?

    Tried the unplug solution.. same thing, Unplugged all the connectors from the main board and reseated all connectors.



    Thanks again

  • Mac Gyver Aug 05, 2009

    dsacco86,
    Thanks for the reply. We reordered another power supply board because the company said it is possible that they might have sent out a bad board.
    Do you know off hand if the power supply board needs a trigger volt to produce the 12vdc, or 24vdc output?

    I have been trying to test the power supply voltage, with just the AC volt going in, and trying to test for the DC Output off the board. The only thing that I have been able to get is the 5 vdc output. no 12 vdc, or 24 vdc.
    Just wondering if the power supply board needs a trigger volt to have it kick out the 12, and 24 vdc.
    Any help would be appreciated.
    Thanks in advance.
    Have a good day.
    Mac =)

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Macgyver do you have an email address i have the same issue with only 5vdc coming out of power supply no 12vdc or 24vdc. any help would be appreciated my email is mhgfuf21@hotmail.com

Posted on Dec 30, 2010

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The next thing I would check out is the power supply for the screen. Most manufactures call it a Backlight Inverter Board. If a part does go bad on this board, it would also cause the stand by mode or protection mode.

Posted on Jul 31, 2009

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  • Devon Sacco
    Devon Sacco Aug 05, 2009

    I'm sure there is a trigger. Sadly, I don't have the schematic for your TV to be sure which pins on the board to jump.


    If the samething happens with the new ordered part, time to rule out the power supply and look at the Backlight Inverter Board.



    With a main board detecting another bad board in the system, it will not throw the trigger. Therefore, staying in Protection Mode.

  • Tony Jazdziejewski Feb 15, 2014

    I have a vizio sv420xvt i already replaced the Power supply & Back light inverter & still it won't turn on. So i'm going for the T-con board & the main board. Something has to work????

  • Tony Jazdziejewski Feb 15, 2014

    Yes i have tested All Caps & did find 3 bad ones on the Back inverter. so i'm going with tthe t con board & yes the main board!

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