OK I DID IT I WAS AFRAID TO OPEN IT , BUT IT IS SO EASY IF YOU DO IT LIKE I DID IT , FIRST UNPLUGGED EVERYTHING WITH THE TV , TRY IT IN OPEN SPACE AND WITH LIGHT , UNSCREW ALL THE SCREWS FROM THE BLACK COVER IN THE REAR OF THE SET ONE BY ONE THE USUALLY HAVE AN ARROW MARK POINTING TO THE HOLE, INCLUIDING IN THE BOTTON OF THE COVER , ALSO UNSCREW THE OTHER SCREWS FROM THE RECTANGULAR COVER TOO THE ONE THAT HAS THE HOLES FOR THE VENTILATION OF THE POWER SUPPLY, SO AFTER THA IT IS DONE , PULL OFF THE ONE WITH THE HOLES AND THEN THE BIG BLACK COVER PULL IT FROM THE MIDDLE AND BE CAREFUL WHEN YOU DO IT BECUSE IN THE INSIDE IT HAS A MIRROR ATTACH TO IT SO BE GENTLE WHEN YOU PUT IT DOWN , ONCE IS DOWN YOU CAN FLIP IT SO YOU CAN CLEAN IT . OK NOW YOU CAN SEE THE WHOLE BACK OF THE T.V. WITH A CLEAN PAPER TOWEL YOU CLEAN IT . THEN PUT IT BACK TOGETHER USE WATER ONLY , GOOD LUCK
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you need to take the top back off the tv. and mind the glass at the top of the rear part top it is very fragile, most of the projection tv have a side cover on each side so you can clean the rear of the screen, as you not said what type screen you have i cannot tell you further.
I had the exact same problem and the fix is easy to do. Unplug the TV first of all and wheel it out so you can easily get to all of the rear screws.
Remove the screws from the ventilated back panel (the piece of wood with a bunch of holes in it surrounding the AV connection panel.
Remove the wood panel you just unscrewed.
Remove all screws from the upper plastic case on the back.
Remove the back plastic case carefully. This is a little tricky due to two metal pins that it hangs on. Lift it upwards and you should be able to free it from these pins
At this point you should be able to see the entire workings of the TV, and consequently the massive amount of dust that has accumulated.
Carefully take a vacuum and remove all the cobwebs, taking care not to bump the mirror or the lenses.
First, I used some compressed air to clean off the lenses and then used a clean microfiber towel to remove all the dust from the lenses, the mirror, and the screen on the inside. Make sure the part you are wiping the mirror and lenses off with is free from any dust or dirt or you will risk scratching them.
Reverse the dissasembly process to put the case back together.
I went through the convergance settings at this point and found that they were all out of calibration and as such recalibrated them. Use the mulitpoint calibration for best results.
take the back cover off as the mirror is attached to it then you can clean the mirror and the inside screen and colour gun lens's (3off) there should be 8 to 10 screws around the outer edge of frame and about 6 to 8 holding the screen portion to the chassis
You'll need to have the frame of the tv either opened so you can reach in there or the top mirror block assy will need to be removed to get inside to the screens. You may want to have a Sony ASC do this type of repair. Call Sony for a referral.