I can't get an image or 4K/HDR on my PS4 Pro system

This was one of my last options after much troubleshooting and it worked! Changing the resolution to 2160p - YUV420 was the fix. My television is an LG 43UH6100 and nothing else was working. I also had to make sure that Deep Colour Mode was turned on for the HDMI port, as it's default setting is to be off. Thanks a bunch for posting this!