I've had the same issue happen to my 50in 6300 model. Bottom right corner overheated suddenly and melted the plastic framing around the screen. I still have sound but picture is black except for a white spot located at that corner . This seems like this could be a fire hazard issue. This TV was only 2 years old and wasn't used daily, there was no warning or indicator that there was an issue. I like Samsung so this is quite concerning, hopefully its just a single model issue since I own other Samsung products.
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