HP 826381-001 function board is a replacement part identified in HP’s service guide for the ProBook 440 G3. The guide also lists this part number as the function board for the ProBook 430 G3, making the intended notebook models clear.
The board mounts to the notebook’s top cover and is secured with a screw. HP documents disconnecting its cable during removal, which helps identify the component in the service procedure.
The function board cable is listed separately as 826399-001 in the 440 G3 guide; it is not identified there as part of this board.