Again, it's not the SIZE the matters, but the resolution... the Apple 30" display has a resolution of 2560 x 1600 (if memory serves), so as long as your TV's resolution is lower than that, there should be no problem using it. And your TV's resolution is probably something like 1366 x 768, so it should be fine.
Just realize that it's not going to look as sharp or finely-detailed as the 30" ACD... because it doesn't have the resolution.