The solution is to replace the screen. It cannot be repaired, but it can be replaced. A few years ago, I had a Samsung screen replaced under warranty. A guy came to my house, and replaced the screen. I would recommend calling a Samsung authorized repair company and get a price for a new screen, but I suspect that you will not like the price. I will bet you a dollar that the problem has nothing to do with the HDMI cable. You have a defective screen that cannot be repaired.
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