On 02/02/2010 21:19, whit3rd wrote:
On Feb 1, 7:47 pm, David wrote:

But every so often the program I'm watching blinks. Every few seconds
the picture blinks black. No corresponding breaks in the audio.

Bad reception is NOT indicated; that would cause the audio to
drop out, and the screen would freeze, not go black.

Two possibilities: your picture circuitry (possibly a video driver
power
supply) has a loose connection, or the TV station is having 'video
difficulties'.

Another: The TV set concerned is correcting for different aspect ratio
(widescreen / normal) between program material and that shown during the
advert breaks?

--
Adrian C