Google BRUISED LCD PANELS to find pictures of failures like that. You could head to www.samsungparts.com and see how much a LCD is but it's usually more than a new set.
Interesting problem when replacement parts are more than the set.
I turned on my Samsung LN52A650, which I have had for a few years now, and the left side had three to four grey circles down the left side of it. I turned off the tv and after awhile I turned it back on and now the circles are black. There are also black lines down the left side of the tv. What could have caused this and can this be repaired?