This is the charging IC for the iPhone 8, 8+, and X. Usually, this is the chip that goes bad when the phone doesn’t power on. My experience is that the logic board passes the tristar tester fine. Usually, you’ll get 0.6A back to 0A on the usb ammeter…sometimes it’ll just show 0A the whole time with maybe a quick flash to 0.1A. The only way know if this chip is bad or not is to just replace it. There’s really no other way to test it.