Sony Rear Projection TV problem

[Firestrider]

Basically my Dad has a problem with his TV in that there are green lines every 4 inches down the screen that converge downwards on the edges. The model is KP-51HW40.

Is this a fixable problem?

[Blackstar]

Basically my Dad has a problem with his TV in that there are green lines every 4 inches down the screen that converge downwards on the edges. The model is KP-51HW40.

Is this a fixable problem?

One possible solution I saw was this:

Yes. You have bad green and red crt's but with an adjustment you can still use it. Remove the front panel and you'll see the focus pack (it's a black piece with 6 rotating knobs on it. Adjust counter-clock wise the red and green screen (the bottom line knobs) till the lines has gone. The best way to check it is to adjust in video input with no signal, just black screen.

Other than that, you made need to have a service guy take a look or have it replaced because it's on it's way out. Unfortunately that particular model has a very bad reputation:
http://www.audioreview.com/mfr/sony/big-screen-tvs/kp-51hw40/PRD_126537_2726crx.aspx

- Blackstar