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Please make sure the content you are trying to watch is 4K or 1080p and also to change the HDMI mode try this : Long press the home button, go to Picture > Advanced Settings > HDMI Mode and select 2.0.
Sorry, there was a problem. Please try again later.I had a similar issue. The answer was that the computer was outputting at a lower resolution than the screen was expecting. Make sure your computer is set for the correct resolution.
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