This just happened to our TV (Samsung 40 smart tv)....turned it on this morning for my daughter and 45 mins later I came out after getting ready for work and the screen had lines in it. When I looked more closely, I noticed the bottom left corner seemed to be off. When I went to touch the screen to inspect it further, it nearly burned my hand. I noticed the casing had melted as well. Luckily my daughter didn't touch it and I've turned off the TV and unplugged it.
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