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First if the mirror which hangs at a angle facing the screens comes apart it can come forward and smash the inner screen.
The best way to proceed is remove the entire front screen frame:
remove speaker grill on front under the screen (if cloth it should pull out in one piece (a few are two piece).
With it removed look under the bottom front edge of the screen unit--left to right there are several identical screws and you have to remove those.
If the front controls (vary by cabinet style) are in the bottom front of the screen unit there will be wires from them hanging down--should be an inspection plate dead center behind where the grill was.
follow the wires from the front control board down with the inspection plate removed and locate the one or two inline plugs and disconnect them (they pull apart and are marked)
With the screws at bottom of screen frame removed and the keyboard free pull out the frame from bottom and slid up about 4-6 inches the entire frame with the screens still in it.
Do not when you do this twist the frame as you can pop the screens right out.
Set the frame and screens to one side making sure not against the screens and avoid touching the inside screen inside the frame.
You should now be able to see the mirror clearly, be careful if cracked as when you release the screws that hold it in it may come apart and use gloves---broken mirrors are very sharp.
Mirror should if you see the plastic and wood slots for it not be too hard to remove and replace. Vac out any small glass as light from the set inside can reflect onto the new mirror or even the inside of the inner screen and be seen in the picture.
You almost certainly are going to have to get the mirror from Mitsubishi---price it with shipping but since its a 55 inch mirror almost any mitsubishi mirror that size will work perfectly--some shops save them....hint.
Most of those mirrors were at or over 100 dollars and a few sites on the net sell replacements in case Mitsubishi is too high.
There is something I remember and it may be the model you have---Mitsubishi can tell you or you can look for yourself----a few models made at about the time this set was made had 2 mirrors----one a tiny one that faces up and reflects the picture into the large rear mirror.
Dumb idea--the little mirror gets coated with dust and brightness drops up to 70%---
The safe and correct way to know is to remove the entire front screen with its frame---both mirrors (if yours has 2) will be easy to see.
The large mirror hangs at a angle and down so it never gets dirty--don't even think of touching it or using glass cleaner on it--any mark on it will show in the picture.
let me know if you want to remove screen unit to see if one mirror or two---a call to mitsubishi would answer that.
All old DLP tvs have a common design flaw,any time this could happen during the tv existing life,the tv problems is call a convergence problems,it dead.Tv have colors lines R,G,B mis alignments,have colors shadows pictures or 3D pictures look alike?The tv convergence board is dead,the board have dead 2 STK convergence ICS and some or all of it resistors too.This parts on the tv convergence board,must me replaced,to solved the tv picture convergence problems.The shop,will cost u like $300-350 for parts and labors.
The Main issues with the Mitsubishi HDTVs that size are the projection bulbs in the rear. A large TV like the Mitsubishi can allow dust build up on the lamps and the mirror in the rear that projects the picture to the screen. An easy fix would be to clean off the dust off of the mirror and bulbs. You would need to go through a tough processto do this since the mirror can be quite heavy and is in an ackward place. The only other alternative would be the need to replace the projection lamps themselves which can cost any where fromm $150 - in some cases $300 a piece for the lamp itself. The Television is still a great set but can cost quite a bit right now to fix if the problem is with the Lamps. If you can afford the Lamp replacement if it is needed the set would last you another 10 years plus. If you wouldn't like to go through the hassle of repairing the set or finding a place to repair the set there are so many new sets out in the market that will give you an amazing picture and quality.
That unit is a two mirror set. Meaning the light engine lens shines down onto a small mirror and that is reflected onto a large mirror and then onto the screen. Gravity being what it is dust and other contaminants cover the lower mirror. Moving the set would only aggrevate dust settling on it. To fix the problem the screen must be removed and the mirror cleaned. You won't believe the difference. It will be like watching a new tv.
Mitsubishi's have been known to "burn in" when you have a stationary image on the screen for too long. Usually its not a problem but in some cases I've seen..if its hours and hours of game play..or even places like home shopping network that have phone numbers that never move during the broadcast...it can cause the image to burn the screen.
The projection tubes would not be burned...it would be the mirror viewing screen.
remove the top back panal screws (be carefull the mirror is connected to the panal! do not drop!) now wipe off and clean the three glass lenses inside..also wile your in there clean the inside of screen and the back panal mirror You will see a big improvment in picture!!
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Take the back bezel off. It should have many screws around it. then once open you should see the back of the mirror. Carefully take the screws out of the mirror, you may have to do some modifing with the new mirror if it does not come prefabed.