Start by taking off the front bottom cover, usually they have screws way at the bottom one on each corner, then uncrew the screen usually there is 3 screws at bottom of screen pull up and out on the screen the screen has small screws in the inside all the way around take them off once you reached screen take it out and split it in half clean it with dry rag then put everything back together exactly the way u took it off before you screw the screen back clean the projectors with dry rag and the mirror with windex or any glass cleaning product.
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I have a rear projection TV that I thought had a scratch as well. Upon closer examination and several attempts to clean, I discovered that there was a spider web behind the screan in front of the color projectors. I carefully removed the screen and gently cleaned the spider web from the screen. Presto no more scratches.
There are two ways to do this---the hard way which is to remove the entire front screen OR
What I do is (with the set unplugged) remove the back cover of the set; you should see the three large black lens.
Most of these sets there will be enough room to get a swiffer duster up inside to gently catch and remove all the spider webs. If there is not enough room let me know and I will tell you how to remove the front screen.
Also---if you can see those large black lens---clean the dust off of them with a lens cloth or paper towel with glass cleaner sprayed on the towel.
If you can reach the webs from the back do not exert pressure when you wipe the inside of the screens---easy to scratch them.
If you have questions let me know BEFORE you attempt this.
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sometimes on sony TV's on the sides you will have a door, that you can open with a screwdriver. if yours have it you might be able to dlean all that web from both sides, if not its a little bit more complex.
Unplug tv first Usually you can pop the front screen off the set. There may be two hidden catches depending on the model. You may want to use two people for this. Once the screen is off removed the spider web and clean the back mirror with some windex, don't clean the inside of screen with any cleaner. Replace carefully the screen making sure it clicks back correctly
I know my response is a while after you asked, but to clean the inside of the tv case is pretty simple.
Remove the bottom speaker cover...on this model you just pull it off. There is no clips or screws.
Once the speaker cover is off you will see the bottom of the screen, there is 4-5 screws on the bottom on each side....I think 4 in the gray plastic and 1 in a black metal strap. With all of those screws out pull out SLIGHTLY on the screen and push up. The top is held in with a down force clamp and you are just popping it out of that....It will pop back in once you are done.
Now clean the back side of the screen, the mirror and CAREFULLY dust off the lenses. I myself did not want to use any cleaners (to avoid streaking) so I used a new microfiber dusting cloth. My picture became brighter and the "crack" that I thought I had was just a dust web....
The front screen with the frame does remove from the cabinet giving you access to the mirror and CRT lens. Remove the speaker grill,remove the four screws on the bottom of the frame, then working underneath a corner proceed to pop the rivets holding the frame to the cabinet. It will seem impossible at first because you have to use a lot of force to pop each one out.When reinstalling,a rubber mallet may help popping each rivet back in (I am not kidding when I say they are tight)
Yes, I have seen this many times. Usually the best way is to remove the upper back cover and clean out the spider webs with a soft, dry cloth, but be careful because the mirror is mounted to the inside of the cover.
I have a panasonic 53 inch and have had the same problem on numerous occasions. I removed the backing of the television, stuck my vaccuum cleaner hose inside the tv and sucked out the spider and the web.