I just replaced my Samsung TV with a new 4K Samsung Neo 90 Model TV and the HD sound will not work. Sometimes if I go to a SD channel where the sound does work and go back then the HD sound will work. that's not a consistent behavior though.
If I unplug and replug the cdmi cable from the Apple TV the sound will work but not consistently.
Very odd and Im stumped.
I have another Samsung TV 4k lower end Model and I noticed about a sec delay before the sound started.
thanks
_R