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Panel should be suspected. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
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It sounds like a panel fault has been started. http://electronicshelponline.blogspot.com/ Check this link, and pull up older posts there. Illustrations of screen shots to LCD panel faults have been described in detail. Compare them with to your TV, and try to find out the faulty component.
Usually, the white dots (they should look more like small squares) indicates that the DLP chip is failing and needs to be replaced. It's located on the DMD board and is very expensive to replace. If you have an extended warranty, call and get them out to check.
If your Mitsubishi TV has white spots in the picture , you can call Mitsubishi @ 1-800-332-2119 and request a free DLP Chip to fix the problem. They will send the New DLP Chip at no charge to a TV Tech in your area to install it for $200 flat rate. That is about a $250 savings if you had to pay for the chip . Call them with your TV's Model number and serial number and let them know when and where you bought the TV. It saved me some hard earned money and now my TV is like New !
You will most likely need to replace the panel. You will have to contact Sony and they will send a Factory Trained Technician to your home to replace it. Since you are not on Factory Warranty this repair will cost you. You may find it cheaper just to replace the television.
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