Toshiba TP55860 proj TV turns off after 2 minutes

I am hoping this is a common problem with 6 year old big screen TV's. The TV shuts down after a few minutes. There is a blinking power button light afterwards. After I reset it (unplug), it does the same thing (turns off after a few minutes). This sounds like a simple part replaced on the board will do the trick. Anyone know what the part can be? thx