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If you have not tried it: unplug the set and if using a cable or sat box unplug that as well---wait for a while and plug both back to see if a reboot of either cures the problem or not.
I had a similar problem after having a Vizio for 2 and a half years. I
left the room for a minute, i came back and the screen went black. I didnt hear an arcing sound though.
There was still power to the unit and you could see that the back light
was working, just no picture, no sound, and you couldn't use any of the
buttons. The only way to turn it off was to unplug it. It would then
start up, with the Vizio logo going from orange to white, and then do
the same thing all over, no pic or sound. I would check the ceramic fuse first on the board that gets power from the plug.
HOW I FIXED MINE: I ordered a new "main PCB" from tigerdirectparts.com
(you can also use searspartsdirect.com). This is the circuit board with
all of the inputs on it (hdmi, cable, etc.) I opened it up,
disconnected the old one, put in a new one and now it works fine.I used
both serial numbers on the board to search for it online. It cost me
$144 to do it, but that's better than $450 for a new TV. My tv is the
vx32l hdtv10a. I hope that helps.
i used to work on the warantee's for relysis from memory that was a deffo dead un we used to swap out on that fault im pretty certain its a dead processing board . . . sadly relysis uk went bust . . . .
I have a 42" LG LCD TV and just experienced this today. Watching cable,
then the screen went to black, but audio continued. I pressed the guide
button on my remote and pic came on with my guide menu. But then went
to black again 10sec later and has remained that way for nearly an
hour. Tried switching off both cable box and TV, disconnecting and
reconnecting cables, but no luck. Finally unplugged mains, waited a
minute, then turned back on. Everything seems normal now after the
reboot. Phew.
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