Red line across top/blue line across bottom of screen

Sound like your Y-Sustain board has one foot in the grave. The Y upper buffer and Y lower buffer boards go when the Y Sus Goes too...

Fix pink and blue line/band on Epson projector
https://sites.google.com/site/troyinphoenix/

turn down the picture level the blue line goes away

Your TV needs the Convergence Amp IC's replaced.Call a good TV Tech for an estimate. Should not cost over $325.

The Convergence Amp IC's are bad. You should call a good TV Tech for this repair.

this would need a optical block. there would be no other way to solve this issue

Sony USA are aware of this problem and have extended all warrantees on this model till 2010!
http://esupport.sony.com/US/perl/news-item.pl?mdl=KDF50E2000&news_id=293

bad optic unit block

Uh-Oh.. Sounds like the BGA RAM in the video circuit. (These units are Intel based and Core 2 duo if posted correct).. We can repair if you need help and its under warranty and sorry its not a home remedy situation..

ikenfixit.com

Inverter board is bad or video cable loose either behind LCD panel or near video adapter.