I see the DMD has a limited life span and will wear out but that's a long discussion. Consumers often don't want to know that.
Read this next discussion and try the links there to try again.
You'll find out more about the DMD life span and the other way to ask for help. If they will cover the chip or labor (rarely they cover both) take it as it's the cheapest fix.
I have a Samsung 55" DLP tv. It developed the white / black spot problem and is now unusable. I've called service, and was told they would be happy to send a repair person ... and charge me ~$400 for the repair. This is a known manufacturing defect, I see the issue all over the place. I asked for review with a customer service manager, and was promised a call back the next business day. No call ... no communication. I called back, and was told again that the repair was my problem.
If this is how Samsung treats its customers, please tell me why I would ever purchase another Samsung product?