Are you sure the TV supports this feature? It's possible the firewire (IEEE 1394) ports are for A/V input only, and are not meant to route data to an external device. I what content are you trying to record? Content from an external device, routed to the TV via an A/V interface, or content from the TV's internal NTSC/ATSC?/QAM? tuner? If your TV is supposed to support this feature and it's not working, i would contact LG customer support.