That's pretty much how flat-screen TVs work, isn't it? No scanning lines, just pixels, so there's nothing to scan. I don't think flat TVs have sync problems, either, as there doesn't seem to be anything to go out of sync if there are no scan lines. Or are there actually such things as sync problems with flat panels?
If it is possible for a flat screen to lose synchronization (e. g. if the signal is too weak), there is no way to adjust the sync frequencies as there was with CRT TVs. Considering digital TV's all-or-nothing nature, however, I would think the picture wouldn't even show on the screen if there were a sync problem caused by a weak signal -- let alone synchronize properly.