Question about Vizio Televison & Video
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?
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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Posted on Jan 02, 2017
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
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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