Alright, I'm high-jacking my thread back. Sorry PoP. \n\nI'm having a set up issue that I believe I have isolated to my Denon AVR X3300W. \n\nIf you've read the thread you know I was trying to pass all inputs through my AVR other than the xbox. The problem I am having is that when connected through the AVR I cannot have 4k and HDR enabled (for which the Ultra HD Deep Color setting on the LG has to be set to on) without getting white snow like pixel flashing and the screen going intermittently blank for a few seconds at a time. When I toggle the Ultra HD Deep Color off and then back on the issues go away but it automatically adjusts the resolution outputting from the source (e.g. fire tv box) to 1080p. If I readjust the source back to 4k the snow and intermittent black screens come back.\n\nNow, when I connect the sources directly to the TV HDMI inputs, bypassing the AVR, everything works fine -- 4K HDR with no snow or intermittent blackouts. So that's why I think the problem is with the AVR. The problem is that I have more sources than inputs on the TV so I'd really like to solve the issues and pass all signals (other than the xbox) through the AVR. I think I have the Video Output settings correct on the Denon:\n\nVideo Mode: Auto\nVideo Conversion: On\ni\/p Scaler: HDMI\nResolution (HDMI): 4k\nProgressive Mode: Auto\nAspect Ratio 16:9\n\nAny thoughts?\n\nAssuming your AVR can pass 4k, and Ultra HD Deep Color, I would then as silly as it sounds, check the specs of ylour hdmi cable. And for the record, I checked out the cx line, and those are mind blowing.