Hi there, Have you tried turning on HDMI UHD colour option under external devices? Just to follow up on my earlier post I have the UE55MU6400 and I managed to find HDMI UHD Colour under the external devices rather than Picture settings. This obviously solved the issue for me, but took a bit of playing around as the option was greyed out until I removed the PS4's HDMI and restarted the TV. After that it has worked fine! Thanks all for your help!
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