For months my 51pw9303 has had kind of a glowing haze. But over night the screen has developed green horizontal lines. You can hear the sound fine. you can see the directv commands fine when you change the directv channels.
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sounds like youre describing a convergence problem. Do the letters look like theyre 3D? If so you will need to replace both Convergence ICs STK392-120 you can get replacements at the following link and they include installation instructions with pictures plus gree tech support. heres the link. http://servicemanuals.vstore.ca/
Try adjusting your Red screen control down just a little. This is usually a sign of the red crt developing a short. Often just turning the Red drive down just a bit will make the retrace lines disappear if not you will eventually need a new CRT or repairs in the red drive circuitry. Hope this helps.
Your green CRT socket may have a solder crack, or it could be the CRT developing a short. You can switch the green CRT socket with the one from the red RT and see if it still flashes green. If it does then its your CRT, But if it now flashes Red, Its a problem in the green drive circuitry.Thts the quickest way to locate exactly where your trouble is. If you need anything further let me know.
The green dot in the center sounds like a burn mark on one or more of the picture tubes inside the set, and the curved lines are telling me that you have a problem in the convergence circuits. The blue haze around everything white tells me you either have a lot of dust build up on the lens over the CRTs, or your picture tube(s) are very weak. If this set is over about 12 years old, I would replace it. I doubt if you will be able to get the green dot out of the picture without changing the tubes which would be VERY expensive.