well my un75mu8000 has the same banding barn door effect as everyone else here. Panel was replaced once already under warranty Since then the problem returned with even more vigor. I started to investigate a little and found that owners of the k series tvs had similar issues. One owner, i feel, made a significant discovery. After their panel replacement seems to habe been a short term fix the issue reurned. The owner disassembled their tv and found that it wasnt the display panel itself causing the issue but the reflector panel seems to show either scorch or dust marks which can apparently be cleaned off. While i am tempted to experiment on my 75" i am trying to find more information to confirm this theory.
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