I Have a LG 55UB820V tv and a HW- J365 Samsung soundbar. I have connected it with an optical cable, from optical out in the tv. and optical in, in the soundbar. I have chosen sound output as external speakers (optical/hdmi/usb) in my tv. But no sound comes out of the soundbar. I have tried to connect the soundbar to my playstation 4 with the optical cable and that works. So the cable and soundbar are ok, but the sound bar and the tv don't seem to be communicating.