Have a soundbar that is connected via ARC and was working fine with XH90. 

Suddenly no sound, and says (sometimes) something like “speakers not active” and hear nothing. Switching to TV speakers and can hear. 

I’ve tried restarting TV and soundbar, unplugging/plugging in HDMI, I then factory reset both TV and soundbar and still no sound. 

I tested the soundbar by connecting to BT and it played fine, so the actual speaker works. 

Anyone know what to try next please, or how to determine definitely if it’s TV or soundbar at fault