This is actually a common problem on your model, what is happening is the DLP chip is failing causing these spots. In order to fix it you will need to have the DLP chip replaced, this can run $500-$600 for repairs. However if you call Samsung and complain, I have been told that they are now covering this as a warranty repair where they will fix it for free no matter how old your set is or how far out of warranty it is. So the first thing I would recommend is to try calling them to see if your model qualify for the free repair.

If you would like any additional information or have more questions please don’t hesitate to ask!

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Thank you,
Tim Nolan