Are you using a cable or satellite box on the set?
I have had my LCD TV for two years three months. While watching a movie, with no indication of a problem, the screen goes black and I could hear the sound. I called Best Buy and the Geek Squad showed up at my house. They said the panel is bad, and charged me $175 for the 20 min visit. I have been researching online for a week hoping that someone has a different answer. I tried the flashlight and can see the picture and messed with the menu options. I tried turning the TV on and off and all I can get is the picture to flash on for a second then its black again. I really think that there is an issue with the power source to the panel.
I would like to know what powers the panel?