Vizio L30 Power on off. I've seen a couple of other threads that are similar but with no real

Question

I've seen a couple of other threads that are similar but with no real solutions. I have a 2005 Vizio L30. When it sits for awhile you can turn it on, it will stay on with picture for about 20 seconds, then it shuts off. The blue led at the bottom turns to purple. The purple led then continues to cycle on and off. If you try to turn the tv on again it will not work at all. If you let it sit again for a half our or so you can turn it back on for about 20 seconds. Anyone have any advice?