User Manual

Always On USB 3.1 connector Gen 1 board
Prerequisite
Before you start, read Appendix A “Important safety information” on page 85 and print the following
instructions.
Replacement procedure
1. Disable the built-in battery. See “Disable Fast Startup and the built-in battery” on page 51.
2. Turn off the computer and disconnect the computer from ac power and all connected cables. Then,
close the computer display.
3. Remove the base cover assembly. See “Base cover assembly (for T490 and P43s only)” on page 52 or
“Base cover assembly (for T590 and P53s only)” on page 54.
4. Detach the connector of the Always On USB 3.1 connector Gen 1 board (hereafter referred to as board).
5. Remove the screws that secure the bracket 1 , and then remove the bracket 2 . Then, remove the board
3 .
74 T490, T590, P43s, and P53s User Guide