That is a classic BAD CAPS symptom. As all this is well discussed I suggest you research BAD CAPS on google or other then inspect for same.
Bob
Well, I've received this TV as a gift from a family member recently and made a few repairs on it myself. I've replaced the lamp, the lamp ballast, did a short on the lamp door(to get rid of the pesky 3x red light), and it worked perfectly. Then, it started taking a while to start up. A week or two after that, it will start up quickly, but while watching, it will black out and the green light starts blinking. After a number of seconds, it will come back on, just to do the same thing again within 5 minutes. I've Google'd this problem to no avail and really want to know how to fix it. I'm on a shoe-string budget so sending it to the shop is out of the question. Somebody please help, this is the only HDTV I can afford right now while enduring such hard times...

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic