I just had the lcd display replaced a couple of month. The samsung technician shop got the replacement from my one time warranty at samsung. Im gonna call that technician but I need to know from samsung community if ever anybody encounter same issue. Exactly same troubleshooting I discovered too. Unplug, turn it on if you're lucky, once is enough but if the problem is getting chronic. You' re not gonna make the QLED logo appear. Im gonna order a new one connect, if it solve the problem I'll let you know guys. The issue by the why I had display LCD replaced was, my friend notice a horizontal line like a tiny hair. ,then I called a certified samsung technician and that was the diagnosis,replaced the lcd display and if you dont have warranty. Better buy a new LG oled.
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