Question about Vizio M420sv 42 Inch Class Edge Lit Razor 1080p 120hz Led Lcd Hdtv

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My Vizio 42 M420SV Powers on the back off. - Vizio M420sv 42 Inch Class Edge Lit Razor 1080p 120hz Led Lcd Hdtv

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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!

NOTE:
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

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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:


My Vizio 42 M420SV Powers on the back off. - 12_4_2012_2_58_24_am.jpg12_4_2012_2_58_44_am.jpg

Posted on Dec 04, 2012

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SOURCE: Vizio won't turn off

This could be a mainboard problem. Sometimes one of the fuses may be bad and may freeze up causing the TV to not be able to power off.

Posted on May 23, 2009

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