My Mitsubishi 52" has a back reflector that is on a hinge, so you simply remove the fixing screws and it swings inward. It gives access to the 3 lenses and you can clean the mirror and remove any pesky cobwebs too. If your projection TV is similar in design, you might want to check that out before you start trying to get at stuff from the speaker grille area (pretty dangerous in my case, exposed electronics!).

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