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Re: Cleaning the mirror?
Usually near the controls there are some screws, remove, then lift aggressively without breaking. Use a eye glass cleaner from Wall mart or such. Need near lab grade alcohol. Can use DEP (home depot) glass cleaner. Be gentle use baby diaper and swab in one direction.
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Remove the cover around the front screen...this is the best way to get to the mirror. You may need a service manual if you can't figure it out how to get it off...but in most cases the trim will snap off.
First off the mirror in your Sony is not a standard mirror. It's called a "front or first surface" mirror meaning the reflective surface is on top of the clear glass as compared to normal mirror which has the reflective coating behind the glass.The wrong glass will throw the focus off and reduce the brightness...how much I really can't say.
Because of this cleaning the mirror is also very tricky...no alcohol or windex. Use an eyeglass lens type cleaning cloth with a light touch. As for the mirror size...try measuring the mirror mounting or "holding clips" area to determine the original size. Another trick may be to ask your local Sony repair center about the mirror size because they will most likely be your only source to order the correct replacement mirror.
The usual cause of the DLP's geeting dull is the front small projection mirror gets dusty and needs cleaning. The mirror is located dead center in the front after removing the screen assembly. Its a small mirror directly in front of the lens assembly of the light engine.
Some projection tvs have three picture tubes called CRT, this crt system requires a little manintenence every once in awhile, lens and mirror cleaning as well as projection screen cleaning, there are other procedures that have to be ran sometimes to return the picture to a regular viewable level. With the projector type of TV, there is usually the light box , mirror and screen maintenence, these procedures should be done at least once a year and only requires a minimum of materials and time, and there are other parts and procedures that can bring the picture to normal viewing levels.
Just a shot in the dark but the first thing i do when i get a blurry rptv in my shop is clean the mirror. Dust can accumulate and create a blurred image. You must be careful however as some of the mirrors are Front Surface mirrors and require special cleaning solutions/techniques. If thats the case using a damp cloth could ruin the mirror. I hope this was helpful.
You should re-consider having a tech do that for you. The access is by removing the screen assmbly which are somewhat fragile. If you want to give it a try, pull the speaker grill off, it comes off just from pulling it, there should be five screws across the bottom of the screen assy, remove those, there is also an access door on the front of the set with four screws, that has to be removed to unplug the cable that goes to the screen sensors. The screen assy has to be lifted straight up an inch or two and then you can pull it forward away from the set.
As far as cleaning the mirror and lenses, you can't get to the face of the tubes so it's the top of the lenses that you clean, just use a soft lint free cloth (cloth baby diaper) and wipe the dust off the lenses, you can slightly dampen the cloth with water if necessary, same type of cloth on the mirror and you can use a glass cleaner on it just don't press too hard on the mirror.
RPG TV's have two serviceable parts. For sharpness of picture etc. Not an expert but the top half is usually the reflector assembly consisting of a mirror / periscope type arrangement, suggest polishing with windex and a microfibre cloth, the bottom half is more a major as its the lcd / crt assembly that would require dusting/ cleaning. If in doubt the bottom half should be cleaned by a proffesional as high voltages can be present. But ISO propyl alcohol is usually a good bet. ;o)