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Not sure but this may be one of the few models made that has a odd issue.
Most of these sets the picture is projected from the optical lens into a a large mirror in the rear of the set.
A few models had the not so bright idea of having the lens shine the picture down into a small mirror which faces up (bad idea) and projects the picture to the large rear mirror.
What happens is the small mirror if there gets coated with dust as near the air intakes at front of set---picture over time will become up to 70 percent darker than normal.
I have tried to compile a list of model numbers that have the 2 mirror setup but never could get them all.
Only two ways to know---call Mitsubishi to see if your model has 2 mirrors or not.--------If it has 2 the little mirror is your problem.
It will depend on if you are able to get at it---entire front screen with frame will have to be removed---set this size it will be a 2 person job.
If you find it has 2 mirrors either have a service call for it or I can give you instructions on how to safely remove front to do it yourself--
If it has the small mirror it will look like a new set when cleaned.
If it only has one mirror you may have a lamp reaching the end of its life---cleaning would of course be much less expensive in most cases.
Not the screen so much as the projection mirror which is located on the rear wall of the Set. If the mirror gets dull it can make the picture dim and dull looking. Cleaning the mirror will help. Some models have a small mirror which projects the image back onto the rear mirror. Dont use windex, just a damp cloth then dry good.
have you tried to take off the front screen and clean the lens and mirrors yet? if this is a philips 9or a magnavox you will most likily need to change the fluid inside the picure tubes
Normally when your picture starts to get darker or dimmer it usually means that the lamp is almost out, your are able to go to a page called discount-merchant.com they have good prices on tv lamps and tv parts also and they also help you with questions you may have.
Cleaning the mirrors will not increase the brightness much. I would double check the lamp setting in the Menu and also the setting of the picture and brightness settings. Many times these are adjustable independently for different inputs. Besides this, I would look at the Ballast and or the Power Supply to cause the problem. I would recommend a professional to look at it if it is not correctable from the Main Menu of the set.
Hope this helps,
Skyassoc
Yes you can take the back bottom of the tv off.You will see 3 bulbs 5or6" in diameter.take a very soft clean cloth spray cloth not bulbs.windex persoal cleaner for your glasses ect.wipe bulbs gently removing dust.Above thes lights are the mirror maybe 10"by12" clean that to spray cloth not mirror than wipe clean"Now get limber and try to reach the inside of the big screen and wipe completely.
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