I have used my ancient iPod w/video (using the cable I purchased from UA) on both PMUA and PMCO 767's with businessfirst (and PS 757's) and as recently as this past Friday on a PMCO 767*.
*got quite a few chuckles from the F/a's looking at my screen showing The Three Stooges and confused looks from pax looking at my screen and trying to figure out where The Stooges were located on their IFE