I've just bought a UE43AU8000, and I'm having an issue with the audio setup. It's connected to a Sony DAV-DZ260 DVD Home Theater System via HDMI (on the ARC port) and Optical.
The main issue is that when you switch the audio output on the TV from 'TV Speakers' to 'Receiver (HDMI)', it will switch back to 'TV Speakers' in a few seconds. In the few seconds it is outputting to 'Receiver (HDMI)' everything is working perfectly, audio is being outputted over the optical cable, and volume control is going over HDMI. Switching it to 'Optical' output does stick, but obviously I lose volume control.
Now I realise that the receiver is pretty old now, and doesn't support ARC or eARC, but the TV is capable of doing exactly what I want, it just won't stay there.
Does anyone know how to fix this, and get it to stay on the 'Receiver (HDMI)' output setting?
I've just bought a new QE43Q60AA and am experiencing the same issue. One workaround I've established is to move your HDMI cable to one of the normal sockets on the TV - a non-eARC/ARC socket, after using the TV remote to turn the TV speaker volume down to 0. For some reason this configuration plays sound through both the TV speakers and back through the AV receiver, so turning the TV volume down to 0 reduces output to just the receiver. Now switch the audio output to your liking.
I should point out that I use a universal remote to control the AV receiver volume, inputs and a few other devices so I don't reply on the TV remote to change the volume on the receiver. The TV remote won't control the AV receiver in this configuration but the problem you're describing appears to be a well-known and well-complained about issue.