I'm very sorry to hear about this. If I had any tips, I would give them. Unfortunately, this sounds like it may need servicing. Here's the thread where you can get details on setting that up: http://forums.cnet.com/7723-13973_102-542437/service-issues-click-here-for-help/
We have a 32" 4 year old Samsung tv. Recently the sound would go in and out. We plugged in a headphone jack & wiggled it around and pulled it back out and the main sound would come back on. It was once in a while before. Now its all the time and much more difficult to get the sound to kick back in. Any tips? thanks!