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The lamp shines into a OPTICAL LIGHT ENGINE, which has a series of lens and baffles---blue is the first part of the engine to get that light and heat---in your case the blue area is damaged from the heat----minus blue equals yellow.
The entire engine would have to be replaced--not a cheap part--Google the model number with "light engine" to get an idea of cost.
This problems is the causes by the tv Light Projection Engine.This repair is an expensive repair.The whole Light Engine must be replaced to solved this problems.Talk to Mitsubishi tv corp.might have some help with the cost of the repair.There is a design flaw on these tv the Light Egine the IC chip controller to the projection light causes problems over again and again.
It will cost you probably in the area of $700.00 to replace the Light Engine. I don't think it would be a good idea to repair it. DLP sets have been out of production a few years now due to high failure rates of the light engines for all makes and models and the consumer cost for the lamp.
I have the same tv with the same problem and have found it to be the dmd chip which controls the mirrors. Once the chip begins to go it just gets worse and eventually will have to be replaced. Unfortunately you can't just go out and buy one and replace it yourself. It is mounted on the light engine circuit board and I got an estimate on the light engine from an authorized service representative and the cost for the part alone is about $900.00. The white spots are when the mirrors get stuck in the on position and if they get stuck in the off position they display a black dot, which I also have some of them. In a month's time my tv has gone from no dots to over 100 now. I have been searching to see if there is anyone who repairs the light engines instead of buying a new one, as this would surely be cheaper and I found a company that does this, but they will not do business with consumers only repair services. They are Hong Video Technologies, so if anyone out there knows how to get these engines refurbished and what it would cost, we both would be very appreciative.
The Optical Block is where the Video and Light from the Lamp is processed then projected to the screen. It is one of the most expensive parts of the set. It cost probably 800.00 to 900.00 maybe more by it's self. You will not be able to find it on line because Mitsubishi keeps a very tight hand on them. Why did he con-dim the Optical Block? I would call Mitsubishi and see if they could help with the repair cost. Their phone number is 1800-332-2119.
I hope this helps,
More then likely your 2005 MODEL has a bad "LIGHT ENGINE". Call an Authorized Service Center and have them give you an estimate, then call MIT's and try to get them to give you a "CONCESSION". It's costly. Good Luck, big IRISH.