A Vizio D65u-D2 flat HD LED 65" TV has worked nicely since we bought it new, about four years ago.
Now, the screen sometimes goes black, and the sound remains on.
We can turn the TV off, then on again, and the picture comes back on.
It might work nicely for several hours, or the picture might go out after just five minutes.
Any clues as to the problem (and maybe even a solution?), people?