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Oh, LCD burn-in is totally possible. It's just that it usually happens to sets that are on the exact same screen for 8+ hours per day, for several years. Commercial environments.
In this case, with the black burn spots, I've seen it before on TVs used for store advertising that were in a window in direct sunlight for years and years. There's a shoe store that has about 4 of them, still in use with similar burn spots. It would be interesting to do an autopsy and see if those spots correspond to, say, resistors on the motherboard. Maybe each spot is an overheated spot.
Blunt force trauma usually looks more like cracked glass and the display goes wacky in the area.
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