Bypass the receiver and plug the devices directly into the TVI’ve been beating my head against a friends 65CX since last Monday and it’s been totally maddening. On TV apps look brilliant but all external devices look dog**** super dark. I finally broke down and brought my own Xbox 1 x and 4K Apple TV over and they are similarly dark.
We have tried every setting and using ISF dark, Game mode and cinema home. They look brilliant using built in apps but all unwatchable dark on other devices.
We set his Denon x3500 to enhanced HDMI so I’m sure it’s not that. He’s using mono price 8k 48gb/SEC HDMI cables.