I purchased the unit in 1998. Over the past year the picutre has become dull.
Some people have warned me not to try and clean the guns and mirror myslef.
One "expert" told me that there was NO mirror in my particular model.
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The tv have a problem known as a convergence problems,it dead.The tv convergence board require changing 2 STK convergence ICS and some or all it resistors to solved the convergence problems.The shop will cost u $300-350 for parts and labors.
You can safely clean the mirror and lenses, it can greatly increase your picture if its dirty. If you unplug your tv you can safely remove the back and gain access to the lenses. All it takes is a philips screwdriver. After you remove the back, you can remove the light barrier between the upper and lower half to free up some room. Take a dry scratch-free cloth and wipe the dust from the lenses. If they're grimy, use a little lens cleaner (liquids used sparingly here, electronics don't like liquids, be careful) You can look up into the top and see if the mirror is dirty. A flashlight shined on it will illuminate the dust/dirt if its there. If you don't smoke you likely won't need to clean the mirror, but it may need it. Use windex or similar for tough grime.. I can usually reach up to get the whole mirror but I've heard of using a swiffer mop to reach the top. Removing the screen is difficult but possible if needed to get inside. Don't touch the back of the screen but lightly with a rag to get cobwebs, etc.
the first thing I would do is to clean the lenses of the CRTs they may be coated with dust that will dim the picture. other than that the CRTs may be failing since the phospher of CRTs fade in brightness over time and the only solution is to replace all three CRTs. the CRTs I have discovered are no longer availible.