Our fire station just got an LG 75UT8000. We have been doing surround sound through a Samsung tv prior. As of right now I can get surround through the LG when playing through the built in apps. But I only get PCM when playing through the HDMI output which plays from an Apple TV 4K. There were no issues through Apple TV on Samsung TV. I haven't changed settings on Apple TV. I've tried auto & pass through options on LG TV and still get PCM through the Apple TV. Currently connected optical output audio through a Sonos Playbar.
Thanks for any insight