I don't think the 767 is any worse than the 757 (or the 737 for that matter) when it comes to the functionality of the satellite TV. The main issue I have with the 767 is the reading lights, which are controlled through the PTV. Often times, they will randomly go on and off throughout the flight.
Originally Posted by
nystateofmind
It is possible you were on one of the four ETOPS Domestic 767-300's which do not have LiveTV because they fly Hawaii routes where for a large portion there is no signal
The ETOPS 767-300s do have live TV, since they fly ATL-LAX/SLC frequently. I have used the satellite TV on the ETOPS 767-300 and it has worked.