TV works for 5 min then shuts off and power light blinks green

1) test the power supply: a) line cord, b) fuse c) c.breaker d) rectifier e) filter,f) switch,
2) measure the horizontal output +125Vdc
3) all other circuit +12Vdc-
4) vertical output +80Vdc

This is very possibly a power surge, can you tell me how many times the light blinks, you probably have a bad power board now if you had a power surge.

The tv main logic board known as a tv Tuner signal board it is the causes and the problems.The tv main logic board,the tv Tuner signal board it is shorted and not taking in and sustance power from the tv power supply board anymore that why tv Power and OPC LED lights indication are flashing together.This main logic tv Tuner signal board that the board where that take in the tv incomming broadcasting signal wire plug into it.U must replaced the main logic tv Tuner signal bard to fixed this problems.If U have some mechanicals skills like take things aparts and putting it back together again?Yes,tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish main logic tv Tuner signal board for the replacement.Tries tv unplug,replug it back about an hour later.Tv might work again for awhile though,but to fixed this problems for good the main logic tv Tuner signal board must have to be replace.

You may have dying power supply module, that will be the first place to check.
Please see my basic troubleshooting guide:
http://s807.photobucket.com/home/budm/allalbums

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://en.wikipedia.org/wiki/Capacitor_plague
Parts: try www.shopjimmy.com or Ebay

the problem in the main power supply it depends of the kind of faillure but normaly to repair it not very expensive
good luck

Sounds like the green CRT has a short.If you unplug the socket from the green CRT tube (the one in the middle) and power up the TV and it stays on then it will verify that you need a new green CRT.

I have the same problem. Just Monday it started, Green light blinks but nothing comes on. Any suggestions?

Ok you got you a Rca ITC222 I See ALOT of these things. To start the troubleshooting.. UNPLUG the set for a min of 30 min the plug back up. ( I have never seen this work) If the set stil fails to come on then you have a processor lockup. The first thing you can conclude if the light flashes is it is NOT a FUSE. THe sets processor has determined that a safety condition has occured and shuts it down to prevent further damage and fire. THe top cause of this include Horizontal output trasistor, flyback transformer and high voltage splitter. but There is about 25 different failures that can drive it into shut down. technicains have interface equipment that can read errors codes much like a car.
typical repairs on this set run 150 to 350... if you have to replace tubes...250 per tube +labor which runs 250 ... these set new cost 800 so unless under warrenty.. you got to determine if it is worth it.

try cleaning The air filter in your set. It may be a thermal problem due to a clogged air filter.

weak power supply