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Vizio VS42L -- Pop and no video

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    #1

    Vizio VS42L -- Pop and no video

    I have a 2008 vintage Vizio VS42L television. Last night while watching, it emitted a *pop* and the screen went dark. No sound, no video.

    When I plug the unit in, I hear a relay click, and the logo LED comes on. When I press the "power" button, I hear another click, but no display/sound.

    I pulled the power supply and the main board. No defects were apparent on the main board. On the power supply, I found this chip. Image attached.

    This doesn't look normal...

    With everything installed and the tv on, I get the 5V standby, but none of the other voltages from the power supply are on. No 24V to the inverters, etc.

    Guidance from the hive mind? Get a replacement power supply?

    Thanks!
    Attached Files
    Last edited by HarvesterOfBeer; 06-09-2013, 11:47 AM.
    Tags: None
    #2
    Re: Vizio VS42L -- Pop and no video

    If you could please post a photo of the entire power supply and it's part number, then maybe someone can ID that chip.

    Comment

      #3
      Re: Vizio VS42L -- Pop and no video

      The power supply is part DPS-283BP. Here's a link to the part from ShopJimmy:

      http://www.shopjimmy.com/vizio-0500-...wer-supply.htm

      I'm suspecting that the chip itself was ok, and that something else caused too much juice to flow through there...

      Comment

        #4
        Re: Vizio VS42L -- Pop and no video

        That IC is the SMPS IC for the 12v/24v power supply section, more likely that you also have two shorted out power MOSFET's which are driven by the IC. When the MOSFET shorted out, it dumped close to 400VDC into the Gate drive output pins of the IC, resistors/diode at the Gate drive of the MOSFET''s are likely to be damaged. You will be better off to get new power supply.
        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

          #5
          Re: Vizio VS42L -- Pop and no video

          Ok, thanks! I'll go track one down. Looks like ShopJimmy is out of stock, unfortunately...

          Comment

            #6
            Re: Vizio VS42L -- Pop and no video

            Found a few on eBay...

            Link to search I did...

            http://www.ebay.com/sch/i.html?_odkw...-0331&_sacat=0


            And a few results....


            Vizio 0500-0507-0331 Power Supply for VU42LFHDTV10A


            http://www.ebay.com/itm/Vizio-0500-0...item3a8136a7da

            http://www.ebay.com/itm/Vizio-0500-0...item4ac56f347a
            Pamela

            Comment

              #7
              Re: Vizio VS42L -- Pop and no video

              @HarvesterOfBeer

              Let me know how you make out with any of the links I gave you for the power supply.
              Pamela

              Comment

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