It could be tunnel collapse, but I have no way of verifying that. Your best chance of success would be contacting the Samsung customer service center directly.
I had this Rear Projection LED TV for approx. 3 years. About a month ago, I noticed there was a 2 inch faded black/Dark Gray bar that runs up and down on the left side of the screen. It is always there.
Can someone tell me is this a misalignment or something else?