I bought this product recently having read some very good reviews, especially about the quality, sound and value for money. What they did not highlight was a huge gap in its USEABILITY. Amazingly there is no way to switch the functionality to play TV sound from the Audio Return Channel (ARC).
If you power the unit on via your TV (Simplink, or compatible interface such as Vierra-link) then it will switch automatically to play the TV sound through the ARC channel. However once you subsequently use another of the units many features (Bluetooth, Internet music, CD or DVD, playing music from NAS device, etc.) then there is no way to switch back to playing TV sound - either using the on screen menus or any of the remote control buttons). The only way to reconnect to ARC is to power both the TV and the home cinema on again! Madness!
I've had many communications with LG Technical Support who have suggested lots of things but none works - it's obvious there is a basic option that is missing from the menu system and the remote.
It's a shame as this spoils what would otherwise be a very nice home cinema unit.