Sony KP-51WS500 projection tv. Screen is green with curved lines

On some projection models of Sony TV sets, this code means that T8005 (flyback transformer), or the associative components in the high voltage circuits are defective on the D board.

do you find any patterrn or red or green lights blinking???

yes u will have to get a expert in but here is a guide to help your tv is going into protect mode if the screen is flashing green with white lines in it its likely that the green tube is faulty this is very expensive & u my want to purchase something else.

Tv detects a loss of (akb signal) from green crt and goes to shut down,you have a bad green crt.

crts are bad

had tv that did the same thing after three years but they were green cost me 300 bucks to get it fixed and the guy said every 3 to 5 expect it

Hi There!
This sounds like a typical problem related to a older CRT.
If you remove the front cover of the tv, you can then remove a wood panel. Behind this panel you will see a block (high voltage splitter) it will have 6 "knobs" on it, 3 will say focus, 3 will say screen.
They will also be labeled R - G - B  
Put the tv on a blank input so you can see the lines clearly on a black screen  - Find the knob for red, and SLIGHTLY turn it down until the red lines disappear. 

or a new lamp. you could first replace the lamp.
the screen might work fine for a couple of seconds, but then it fades away or deteriorates. This means the lamp is going bad.

hey dave..start with all 3 screens at min...and bring eac hone up till you see that color and stop..........

I hate to be the bearer of bad news, but you have a shorted red picture tube.It is not at all uncommon on sony rear projection. The gun shorts and the set identifies the problem and goes into shutdown. Usually there are diagonal lines in the picture before it shuts down. this is an unfortunate problem because this set delivers a great picture. The dealer cost of the tube is around $200. When the repair is complete your're probably looking at $400-$600. The only problem is that the green tube and the blue tube also have chance of having the same problem. It'a tough call . But from my experience , I have replaced the green tube and had the blue tube goe within a year. Scrivitron