Our TV picture works fine then blacks out with audio continuing to work ok.Now after some time picture works ok for about 20 seconds the blacks out with audio continuing on OK.While we bought this in 2008 the TV does not have high usage since we are gone 6 months a year.We are on Comcast cable.

I think you chose a Westinghouse Lemon, go this site and read all of the negative reviews of this model;

http://reviews.cnet.com/flat-panel-tvs/westinghouse-sk-32h240s/4852-6482_7-32429419-2.html?tag=userReviews;page

Here's just one of the reviews;"best chunk of aluminum i ever had the fortune to buy"by stevecox25 on June 11, 2009-->
"Horrible customer service on a worse television" by westinghousecrap on March 20, 2009 Pros: Good picture once it is properly adjusted.
Cons: Low quality audio, had the TV for 10.5 months and the picture went out, sent the TV at MY expense to TX, and I've been waiting for 2 months, and customer service can only say that there is a "delay". And they don't send a new TV, it's a rebuild.
Summary: Please don't waste your money on this TV, spend a little more on a different brand and save yourself the headaches I've had. I'll never purchase a Westinghouse product again. Customer service has been no help, and their answers are vague at best. Learn from my nightmare, NCAA march madness on a old 19" TV because my Westinghouse quit working 2 months ago and they still haven't replaced it.