i am having a similar problem. i just got a usb tv tuner and want to hook it up with my tv2 but don't know how to do it. tried scanning for channels but always got 0 results. their are two modes of ATSC antenna and ATSC cable. tried both but still doesn't work. the coaxial cord works perfectly with the tv and is currently set up on channel 26 and over-air. their is no channels to et it on under 26. 26 through 73 are for over-air and 74 through 125 are cable setting. i have a kworld ub435-q tv tuner and the 622 receiver. wondering if anyone knows how to use tv tuner with tv2