Screen turns green and tv powers off.

you might have burned to LED screen out

GET A NEW TV

Green CRT is most likely the problem. That model is famous for weak CRTs.

Ur tv have a problem known as convergence problems.Ur tv convergence board must have it 2 STK convergence ICS and some or all it resistors to be replaced to solved convergencce problems.The shop will cost u $300-350 for parts and labors.

Convergence is dead.Must replaced 2 convergence ICS,and some or all it resistors.Can u do soldering electronics parts?Buy a convergence kit at websites Tv repair World.com,Tvrepairkits.com to repair it ur self.The shop will cost u $300 for parts and labors.

It is rear projection TV that use 3 picture tubes of red-green-blue to show color picture on tv front screen.
Do you see standby red light blinking when TV shuts off after showing blue image for a while?
If red standby light is blinking, please count it how many times it blinks, there would be 3 seconds pause between blinks so count pause to pause and post it here to find out possible solution.
Thanks.

Its the convergence output ICs or the solder connections beneath them.

michtech

If TV shuts off after turn on Blue Tube could be bad.

your convergence IC;s are out, they cost about $40, if you know how to solder, you can do it your self, if not , I would try to find somone that can, service centers charge about 4 or 5 hundred, after you get the new ones, there easy to find on the board in the back of the tv

blue crt shorting use crt restorer to lift short or replace picture tube /crt

sounds like bad convergance ic
http://www.techlore.com/forum/thread/18970/Sony-KP-46WT500-Convergence-Repair/