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Hi, much easier to access the front screens (there are 2 sandwiched together) by removing the top back cover, be prepared for lots of screws and when you get down to the last 2-3 screws get some help, on the inside of the back cover is a large mirror, some are made of mylar, do NOT clean or even touch a mylar mirror, the others are made of real glass and the back will be much heavier than you think (and very expensive if you break it)once the back is removed you should have access to the bug, good luck, video-tek
first thing i would look at is it is probabily dust on the lences and miror, you need to take the screws out all the way arount the screen from the back, then lean the screen out tward you from the front, do this while the tv is on, you will be able to see the dust alot better, take a soft cloth and glass cleaner and clean little miror, and lences
I fixed it!!!! If you can open one of the sides (on the JVC there is a little door with a screw), then you can clean the projector lense in the middle on the bottom. It kind of looks like a big light bulb. It seems there is just dust on the glass that is projected onto the screen. We had a big gray spot and cleaned it with a damp glass cloth and Ouila! It disappeared. I scored MAJOR brownie points with my husband for this one! He wanted to replace the TV!
You'll have to pull the front of the unit off to clean the inside. This includes taking out the screw that are open normally and there should be about 4 screws that are behind the bottom-back panel.
When you open the unit just be sure you get it clean the first time and don't leave any stray fingerprints on the glass. And don't touch the projection lens at all. Use compressed air to blow it off but I wouldn't recommend cleaning it unless it is just filthy and the canned air doesn't work for you.