We have the same issue and they refuse to do anything about it. We have extended warranty and they are claiming we did the damage to the TV ourselves (which of course we did not). I would be very interested to know if this got resolved. Ours has giant spots down the left and right of the screen. We woke up one morning and they were there.
We purchased a Samsung 50", 1080p LCD TV about 2 years ago. Yesterday when I turned the TV on I noticed a perfect black half circle along the bottom of the screen, in the middle just above the Samsung logo. When I turned my TV on today I saw two more, along the left-hand side of the screen, and one more beginning to form in the bottom left corner. I also noticed that the one that formed yesterday was beginning to grow bigger. I left the TV on for a bit and it appears that the ones along the left-hand side are already starting to expand. Has anyone had this problem? What could it be?