I was having issues with my TCL 75R617 and Apple TV 4K. Both were only a few weeks old and I had a lot of problems; including poor image quality (color issues, banding, incorrect HDR, sometimes no display in 4K), CEC issues, and UI lag when navigating with the Siri remote. I've tried everything I can think of to troubleshoot. Besides fiddling with all the settings on both the TV and the Apple TV, connecting the Apple TV to another TV to make sure it's working properly, I was desperately trying…