Vizio TVs are prone to develop power failures for one of two reasons: 1) the power board has blown some electrolytic caps, and they need to be replaced, or 2) the main board has blown one or more of six low-voltage DC regulators (AMC1117). The parts are cheap, and if you’re comfortable with disassembling the set and performing some PCB repair work, you can do it at home.
Unfortunately, schematics are impossible to find and the debug information Vizio gives out is minimal. I had to make a couple of passes on my VX32L main board to find the bad regulator. With a datasheet for the AMC1117 you can figure out which one is dead, using just a voltmeter. Have a high-wattage soldering iron ready to deal with the tin solder, and a good magnifier.
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