USB Power Protector Chip Compatible For iPhone 6S / 6S Plus (Q4500: 04S0D268822F4: 3 Pins)
USB Power Protector Chip For iPhone 6S / 6S plus (Q4500, 04S0D268822F4, 3 Pins).
If your phone is not charging from USB/mains, then this the part you need.
This is not motherboard for your iPhone, it’s a small ic as soldered on motherboard.
You need skills in replacing small BGAs to install this part.