I think I've made a schoolboy error buying a soundbar. I have a Panasonic TXP46G20BA TV and bought the LG NB3520A soundbar. I can't get it to work with the TV, it connects with a digital oprical cable. From what I can see there is only one on the TV and that's marked up as AV3 with a headphone symbol. I've connected the cable to this but there's no sound. It's definitely not the unit as I've played music via the USB with a memory stick.
Do I have not have the correct connection on the TV or am I missing something obvious ?