Alright, my home theater system doesn't support progressive scan, so all it can output is a 480i signal. I've purchased 2 sets of component cables from Best Buy, one being their cheapest which came with a TV I bought from them, and another being a higher quality, ~$30 cable- I would assume they are YPbPr since that's what nearly every consumer device here in the US is, but they don't explicitly state that on the packaging (typical). The problem is, with any 480i source the picture doesn't show any blue- unplugging the blue portion of the cable from either the TV or DVD player makes no difference whatsoever. I brought both cables to a friend's house who has a progressive scan DVD player with a little hardware switch in the back to change between progressive and interlaced. When his player is set to interlaced mode it has the same issue, no blue. The cables both worked fine with progressive scan enabled.
So, is this a common or at least heard of problem, a color missing in interlaced mode? Are they just really crappy cables and I shouldn't go to Best Buy ever again? My best guess is manufacturers are just trying to cut costs assuming people don't use 480i (oh woe is the decline of the CRT), and are somehow removing 480i support from their cables. I don't want to have to buy a whole new home theater system just to get the quality component has to offer, and I'd prefer not to use composite for obvious reasons. I was considering purchasing cables from monoprice.com (where I usually buy my cables) but I want to get some sort of guarantee they would work; their live support wasn't very helpful in that regard. Does anyone have a recommendation?