HP 821667-001 touchpad board with NFC antenna is a replacement component for the touchpad assembly in the HP EliteBook 820 G4 and HP EliteBook 828 G4. HP’s service guide identifies this part number for the board with antenna, distinguishing it from the touchpad board without NFC antenna.
The board connects to the smart card reader board, while its NFC antenna connects to the computer’s NFC module. This makes the part relevant when replacing the specified touchpad board and antenna assembly. The service guide includes removal and reinstallation instructions for the component.