The Samsung supporting 240p makes sense, I have a 19" LCD one that does, though it has some issues with SNES 240p (waviness). I haven't tried a TurboDuo signal on it though. But yeah, I noticed Samsung continues to support 240p. The 26" Sanyo LCD that is my desktop monitor demands 480i minimum however, so 240p fails... It's too bad cause this TV has every connection ever made, right up to HDMI: RF, Composite, S-Video, Component, VGA, and 2 HDMI, etc.
My father in law has two tv's, one plasma and one lcd. I have an lcd as well. All three support 240p, It must be common as my father in laws tv's are brand new.
I wouldn't say that it's common. The standard is to demand 480i minimum on the green Luma/Y jack when it comes to a Component signal, while 240p is still acceptable via Composite/S-Video. The last Black Friday sale, I bought 2 19" LCD TVs because I wanted one for mod testing (with 240p), but none worked, so I returned them. I think one was a Dynex, but I can't remember. I should've made a note of them.
Anyway, this mod for the TurboExpress is great for other reasons too: I'd like to do it also because you'd be able to walk into the store with it, quickly hook up the Luma jack to a display model of a TV you might like, and boom, check right there if 240p is supported! I bought one, opened it, tested it, no good, took it back, bought another, repeat, etc. Don't wanna have to resort to that when I go for a big screen plasma after my current CRT TV (for my entertainment center) breaks down.
P.S. - Oh, so you don't wanna mention how much you spent in total for modding ??