HP ProBook 4430s, 4431s, 4330s and 4331s Notebook PCs - Maintenance and Service Guide

5. Lift the board straight up out of the computer (4)
Reverse this procedure to install the USB board.
System board
NOTE: All system board spare part kits include replacement thermal material.
Description Spare part number
For use in UMA models with USB 3.0 and WWAN 646325-001
For use in UMA models with USB 3.0 and without WWAN 646326-001
For use in discrete models with USB 3.0 and 512-MB graphics memory 646327-001
For use in discrete models with USB 3.0 and 1-GB graphics memory 646328-001
For use in discrete models with USB 2.0 and 512-MB graphics memory 658334-001
For use in discrete models with USB 2.0 and 1-GB graphics memory 658335-001
Before removing the system board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
Component replacement procedures 93