HP 831761-601 is a system board for the EliteBook 820 G3, identified for configurations with an Intel Core i3-6100U processor and UMA graphics. It is the Windows version of this board number, distinguishing it from the related non-Windows part-number version.
The board provides the laptop’s main system-board assembly for a corresponding repair or replacement. HP’s service documentation associates this processor configuration with UMA graphics memory and notes that system-board spare-part kits include replacement thermal material. The listing identifies the specific 831761-601 part as the i3-6100U UMA board for the EliteBook 820 G3.