SOURCE: power supply
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SOURCE: vizio 47" lcd no picture no sound has power
this could be one of two problem. first, check if you have back light. If you do then the problem is with the M/B. Second, if you don't have back light then the inverter is bad and needs to be replace.
SOURCE: hello our vizio 47 led
Sounds like you have some bad electrolytic capacitors.
If you are
tech savvy, open up the unit and look for capacitors that have bulging
tops or leaking electrolyte / bulging at the bottom and replace any/all
that look like this.
In most cases, this will fix you right up quick.
The capacitors will be near the power input and the inverter stages of the circuitry.
SOURCE: How do I test a High Voltage Transformer on my Vizio VU42L-FHDTV10A?
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.
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