This is commonly known as a light tunnel failure. If you call 800-SAMSUNG, that can be serviced.
I have a Samsung DLP HL-S5087W 50". The left side of the screen has a one or two inch dark strip where you can still see the rest of the picture in color but without brightness. Its like the light shining on the screen is out of alignment. Is this common with DLPs? What might be the cause and solution to this? Thanks!