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In order to clean the Picture Tube Lenses you will have to remove the front screen. As for cleaning the screen use only correct screen cleaning solution or just replace the front screen if it is streak to badly.
The entire screen unit can be removed but first remove rear cover and look at the lens--clean with a lens cloth etc----peek up inside and look at the mirror--if not dirty or smudged just clean the lens.
removing the screen with its frame can be tricky--easy to damage the screens etc. Removal usually requires front speaker grill to be removed first---most just pull off but a few are secured from rear by some screws.
With it off look to see if at bottom of screen there are a row of screws--if the entire front unit can be removed it will pull out at bottom and be snapped in place.
A better suggestion is look at rear of set above back cover--if the upper part is plastic--it with the back removed can also be removed--careful as mirror is bolted into it---that way you can clean the mirror and get at the lens for the tubes without trying to remove screen unit--some of the smaller sets this is the ONLY way to get at the mirror.
Yes a number of screws but if plastic upper rear comes out with mirror much easier and safer way.
If you really want to clean the lens then take the screws out from around the frame. The screens comes forward and the lens would be sitting in the middle. be extremely careful not to scratch the lens at the same time clean the back mirror and the inner screen. thats it.
Now, I hope that works for you because when a JVC HD-ILA starts blotching is because there is build up inside the lens and there is no way to clean that. to get rid of this problem is to replace the light engine which is super expensive.
it's fairly easy to remove the screws on the back bottom portion of any rear-projector television. when the bottom part is removed, you will see both the mirror and the 3 lens. isopropyl alcohol or windex should do an efficient job. a soft lens rag can be found at any camera store. i'd spray the lens rag instead of the actual lens or mirror when doing this job.
Did he think the programming stunk or something??? lol sorry. Sometimes the screens or lens is truely what they are are two piece type lens, depending on the make and the age of the set. On two piece screens (or lens) theres an outer type called a linticualar lens and the inside is like a light house lens as its called a freznal type lens. On Some makes and models these come apart BUT also in some makes and models they are a one piece design. as theres an inside ground lens and the other side is another ground lens. But im woundering if yours isent the two piece type that could be taken out and separated and cleaned as why would it suck up into the lens if it wasent??? I would call a specialist and ask them if its a two piece and could be cleaned or is it a one piece. Try calling toshiba first so you know what it is so you dont get ripped off so the repairperson wont pad the bill. Good luck Oh try calling this # first. 800-457-7777