I have a samsung projection tv. about 3 weeks ago two spots appeared. now there are over 30 spots. conveniently, they started appearing just weeks after the warranty expired. I went to the store where I purchased the tv. they told me it could be the lamp was going out or the mirrors (of which there are thousands of them) are going out. don't quite understand how a mirror can "go out" but was told if that was the case, it would be cheaper to just buy another tv.
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There seems to be an issue with your DMD board, which is the on in charge of the pixelation. What you can do to confirm if it's indeed the DMD board, is the following:
GO to the menu on the TV and if the dots show in the menu, it's your DMD board, but if they don't the issue might be with one of your Video Boards.
It seems you have an issue with your DMD board, so pretty much you will need to replace it, those boards are running around 180 dlls, it's worth to try, but eventually you will need to give maintenance to the Tv
Mine is having the same problem. It started around Memorial Day and is only getting worse. One white dot is now a dozen. I called Samsung several times and was given the brush off. They clearly know this is a problem and are failing to respond to the problem in hopes that people will deal with it on their own. It does not matter if your warranty is expired. This is a latent product defect. They are still liable and obligated to fix the problem. I have filed a complaint with the better business bureau. If the company does not respond, I'm taking this to small claims court to get reimbursed for any cost to fix my tv.
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 !
same problem for me ... check out this thread on AVSforums about it.
I have the same exact tv as you and had the same problem. I took it to a repair shop who told me I needed a new DMD chip and that it would be 850 to fix. I used the information in thread above to get the part number and bought the chip on ebay for under 200. Here is a link to the listing CHIP
People have had good success. I will be replacing mine tomorrow.