I have a HW JW7500 curved soundbar which has now been rendered useless. It is attached via the HDMI Arc and has functioned perfectly since I got it in 2016. Now the Samsung UE65MU6400 says there is no signal coming from it at all although it recognises a connection. It doesn’t turn on or off with the television. I cant even tell what firmware it has as I have nothing to read it on. Infuriating.
I found a workaround which let me turn the soundbar with my TV, also using the remote controller with an AppleTV for volume (as opposed to D-IN which made me use the soundbar remote controller for that).
Just connected the soundbar HDMI output to the SmartTV ARC HDMI port. Didn't use the soundbar input, no hdmi cable attached to this port. Then, select the Soundbar (HDMI) as sound source.
Automatically turns ON with my TV and it lets me use the TV Remote control with all available sources.