missing u7190 from MLB

Am working on a late 2015 macbook air, board number is 820-00165, have a few donor boards laying around and ALL of them, even the one I am working on (no green light on charger) are missing U7190 (among other ones) which seems to output more power signals. Basically my question is if different configurations of macbook airs from the same year would have this precise chip missing, or it is a DEFINITELY needed chip. I do not have a lot of experience (obviously)

so I would not know this. The schematic states that is needed so I am assuming it is, I am just wondering if I am wrong?