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How do I test a High Voltage Transformer on my Vizio VU42L-FHDTV10A?

I have a Vizio VU42L-FHDTV10A that won't power up by button or remote. I replaced the power supply board with no luck.No lights come on although I have power into the powerboard. How do I test the High Voltage Transformer? Or, could it be something else? If so, how can I test the other option as well?

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  • Dick
    Dick Nov 06, 2012

    Is it possible to tell me where I can locate the 5vdc on the mainboard and the "on" terminal on the power supply board? I've got a multi-tester and can do the test. I just don't know where these points are. If it helps, the mainboard # is 0171-2272-2364 (3642-0112-0150(4A). The powerboard # is DPS-283BP A. Thx.

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  • Vizio Master
  • 933 Answers

It could be the main board. The main board controls the standby light on the front of the set. Check and verify that your 5vdc standby voltage is working. Next, I would check the "on" or "ps on" input on the power supply board. When you turn the set on (either my side buttons or remote) the main board should send a 3.3vdc signal into the "on" terminal on the power supply. This "on" signal from the main board turns on the other half of the power supply thus turning on your set. If you are not getting this signal from the main board, I would suspect the main board. To test your power supply, you can simply put a jumper from 5vdc to the "on" terminal on the power supply. Your 12vdc, and 24vdc power supplies should then become active.

Posted on Nov 01, 2012

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  • 41 Answers

SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing

Yeah if you don't have any power at all, no lights or anything its the power supply.

Posted on Oct 08, 2008

  • 187 Answers

SOURCE: I want to know how much a Vizio VU42L FHDTV10A screen costs.

The price range is 500-800 depending where you will get it, try Ebay and look for a non-working one with a good panel (screen), it does not matter why is not working as long as the panel is in good condition.

Posted on May 27, 2009

eagle338
  • 4889 Answers

SOURCE: i have a vizio vu42l

There not need not be burn marks when components are shorted. And yes I do think its definitely a case of short in the power supply. I am 100% sure replacing it would resolve the problem.

Posted on Feb 16, 2011

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First of all, thank you for posting your question here at Fixya.

Based on the symptoms you've described, I don't believe that the backlights are already faulty. If backlights gone to malfunction, that are permanent, but in your case you've said that the TV power up fine for half an hour, this is an indication that the fault not came from the backlights but from the inverter boards. Inverter boards are the one giving high voltage to the backlight to light up, it has a built in protection circuit that will activate once there's a malfunction on the board to avoid further damaged because of high voltage output.
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Hope I helped you.
Have a nice day!
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i hope i help you..
please rate my help...

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