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change the coolant in the CRTs. Its avery common problem with that model. The color gets dim hard to focus and often you will see halos around objects. You can get the Phillips CRT coolant replacement kit at the following link which contains the coolant and step by step instructions on CD that shows how to do the replacement. Heres the link. http://servicemanuals.vstore.ca/
You need to clean the projector lens on the optical engine using a soft cotton or, better yet, a chamois cloth. Also clean the mirror mounted inside the rear cabinet and also the front and rear of the screen itself. If picture is still blurred then your the optical engine is most probably defective.
Sounds like you need Coolant fluid change, this is the fluid under the Lenses. If you have not done this before I suggest that you get some one who is qualified. Because if the coolant leaks and get to the circuit board, there goes your tv. You need new fluid in the 3 CRT's. If you look down with the back off and looking in the lense, you would see contamination in the fluid, this needs to be taken out and cleaned and replaced with new fluid. The fluid can come from places like MCM electronics corp.
The are controls on the inside of the tv above the circuit boards for focus and to turn up intensity of the projector lamps (red, green, and blu). If you turn it up too far all three projector lamps kick off. If this happens, power off the set and turn down the lamp that you turned up. Power it back on and slowly turn the projector lamp up until the picture looks OK. You have to take off the panel on back of set to get to the controls.
It sounds like the 3 "GUNS" are not aligned.
One the controls at the bottom, left hand side You will see an arrow pointing to the first 2 on the left.
That will allow you to scroll down the list of options until you see....CONVERGANCE!
make the red gun center by using the up/down arrows on right. Then add the next 2 until you see a white X or cross.