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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.
The DMD chip is failing. The little mirrors on it are sticking in the on position therefore always reflecting the white light from the lamp. The part number you will need is 4719-001981 and is available from the Samsung parts website. I have included a link to directly purchase the part from them. Please take a moment to rate my answer. Thanks...
Bad news, The Light engine has gone bad.The cost of the light engine is usually over $800.
Do Not Repair. Cut your loses. Always buy an extended warranty on any new electronic gadget, especially a TV. It will pay for itself.
Are they spots or dots? If they are spots then the optics are contaminates. If they are dots either white or black then you have a bad DMD chip. The cost of repair depends on who you hire to repair the set or if you do it yourself it depands who you purcahse the part from.
Are the spots fixed or do they move with the image? Verify that all venting is clean of dust. If the spots are fixed and upon close examination are a square shape, The device is overheating of failing. If the spots are moving with image it's a front end problem, and can be overheating as well.
If these spots are small, they are likely the visual effect of a failing DLP chip. When some of the tiny mirrored surfaces on the chip stop moving, this is the result. This is not something you can fix yourself. A Samsung authorized service center will charge $400-$500 to replace it for you.
Worked a charm on my 50" Samsung DLP. Read thread carefully as there are 2 different version of the DMD chip you will need to replace. I ended up fixing mine for less than $165!
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