Question about Vizio M420sv 42 Inch Class Edge Lit Razor 1080p 120hz Led Lcd Hdtv
If the VIZIO on the front of the M420SV lights up white, then the set powers down after a few seconds without a picture or sound, there's a good possibility that the problem is the result of a bad/corrupt software update on that 'Smart' TV.
This can be fixed by calling Vizio, who will probably send a flash drive (0940-0000-4140R)containing a firmware update that should fix the problem.
To use that flash drive:
With the TV unplugged, insert the flash drive in one of the USB ports on the left side, then plug in the TV power and press-&-hold the power button on the TV. (Vizio can give you better instructions when you speak to them.)
It took 2 power on attempts before the update 'took' on the set I fixed, but it DID fix the problem!
I HAVE seen the same symptoms on a similar model, but that problem was caused by a bad wire-to-pin crimp on one of the board edge connectors.
Posted on Sep 24, 2014
Suspect number one is of course the power supply board in the set, if look there look at the filter caps for ones like these:
Posted on Dec 04, 2012
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Posted on Jan 02, 2017
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