I have a Sony HT-G700 soundbar. Apple TV 4K (previous model with touch remote) and an older Sony Bravia (1080p) TV.
I have the Apple TV plugged into the soundbar and the soundbar into the TV (via HDMI eARC/ARC). I have HDMI Standby Through enabled, which should allow the sound and picture of the device (apple TV) to pass-through to the TV without turning on the system.
When the soundbar is on, the Apple TV plays as it should. Picture on TV, audio on soundbar
But when I turn off the soundbar, the Apple TV signal gets distorted colorful pix-elated 'snow' type screen. It flickers for a while, I assume trying to find the right screen mode, before it stops sending the signal all-together.
It does not like the pass-through. If I power up the soundbar again, it all comes alive and works.
I tried to replicate the error by plugging my PS4, WDTV into the sound bar, passthrough works fine.
I spend hours trying all sorts of settings on the soundbar but nothing fixes it. Oddly enough, I did get it working for a few days (?) when I changed the HDMI cable. Now nothing works.
The work around is I plug the Apple TV directly to the TV, then it can use the TV speakers or the Sound Bar via the TV output. Downside with that is, it doen't have atmos support.
Does it work with the soundbar off at first, and turning on the ATV?