I'm trying to get audio out of my LG tv (LG 39LN5400) to a soundbar (AUVIO 4000457) using the supplied red/white cables, but it seems the tv doesn't have an obvious audio out connection, just ports marked audio IN. The soundbar hasa Bluetooth functionality but I can't seem to find any Bluetooth on the tv. I've looked at the TV's audio menu and cannot find an option on this tv to change the sound output..... any ideas on how to make this set up work?