* Color Depth, often default set to 10 bits or even 12 bits. Most TV’s do not support higher than 8 bpc. So set back the color depth to 8 bpc on your pc.
* Make sure to have the latest AMD Crisom driver installed.
* Make sure the HDMI port your using on the TV is HDMI 2.0 capable or 3840x2160p 60HZ capable. Often TV’s have like 4 HDMI ports, but only 1 is suited for “2.0” standard.
* Turn on “UHD Color” if possible in the settings of your TV for the HDMI port to which your pc is connected.