HP 917894-001 NFC board is a replacement part for the NFC assembly in a compatible HP laptop. The service guide identifies it specifically as an NFC board, so it is intended for restoring that board component during repair.
The board sits on the keyboard/top cover and is secured with double-sided adhesive. Its cable connects to both the board and the card reader board through ZIF connectors, allowing the cable to be released during service.
The board is supplied without its cable. The guide lists the NFC board cable in Cable Kit 917893-001, which is a separate part.