I have a QN65Q6FNA 65" smart tv. The tv I purchased 2-3 years ago. The screen stays black for sometimes on days end. I mirror the tv to my Samsung fridge and all pictures and features are operable, and all sounds work. I've reset the tv, unplugged all cables, unplugged it for hours at a time. For some reason the tv does this and is doing it at least every month now. What is the cause of this?
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