The G550 came with a cable adapter that attaches to the HD15 jack and brings out the analog video signals, both RCA and SVideo. Last night I was using a standard monitor attached to the HD15 jack as the secondary display. So tonight I tried this cable adapter and attached it to a TV. (Actually, a tv-to-VGA converter box connected to the same monitor.)
Still works, although the picture seems washed out and the aspect ratio doesn't look quite right. I need to experiment some more, but this might be a good way to make analog tapes directly from hi-quality DV AVI files; i.e. no additional compression necessary.
While you're researching, keep in mind there are different flavors of the G550. The one I have has both a DVI and an HD15 connector. If you get the version with only the DVI connector, I was told you'd have to purchase an expensive TV-out adapter separately.