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I have a 2006 SXRD 50" TV. The same thing happened to me as the TV warmed I would get this yellowish tint that started to fill my entire screen. This is due to a bad optic block. Sony actually had a recall on this and was able to get a new one and have it installed. Here is a link explaining what it is. You might still be able to get a new optic block if your model number is affected.
I believe it is called the "light engine" is going bad. The Sony SXRD is NOTORIOUS for this going bad. So much so that there was a class action lawsuit that extended the warranty. My 50" SXRD went bad after 12 months. Because of the class action lawsuit, it was basically fixed for free.
My Sony KDS 50 A2000 is 17 months old. Its the 50 Inch SXRD projection model. About two weeks ago the screen developed a green tint with cannot be tuned out, then a few days later the message began to appear on the screen that the bulb was nearing the end of its life and must be replaced. Fortunately I have the Circuit City extended warranty. I called and within just a few days a serviceman came out and replaced the projection bulb. The Result: No change in the picture, the green tint remains on all channels, so I'm awating the next service call. Under the service warranty they have the option to repair or replace this set. If indeed this is the light engine (optical block) which I suspect and its going to cost $1,000 or more I may be looking at a new set. When it works this is a great TV, but I have had three Sonys now including two other standard CRT models and now this one joins them in the junk heap, the other two also bit the dust after just about two years. Is it time to give up on Sony? I know they have a class action suit on a similar model for this same problem. Caveat emptor
You have dust on the lcd image plate and about all you can do there is take it too the shop. Unless you have an expensive dust free enviroment and know how to dismantle the light engine...
It's not an expensive fix for a qualified shop - call around and explain what you have here in your post. A good shop will know what this is right away...