User Manual

1. Go to Control Panel and view by Large icons or Small icons.

2. Click Power Options, and then click Choose what the power buttons do on the left pane.

3. Click Change settings that are currently unavailable at the top.

4. If prompted by User Account Control (UAC), click Yes.

5. Clear the Turn on fast startup check box, and then click Save changes.

To disable the built-in battery:

1. Restart your computer. When the logo screen is displayed, immediately press F1 to enter the UEFI BIOS

menu.

2. Select Config ➙ Power. The Power submenu is displayed.

3. Select Disable Built-in Battery and press Enter.

4. Select Yes in the Setup Confirmation window. The built-in battery is disabled and the computer turns off

automatically. Wait three to five minutes to let the computer cool.

Replace a CRU

Follow the replacement procedure to replace a CRU.

Base cover assembly (for T490 and P43s only)

Prerequisite

Before you start, read Appendix A “Important safety information” on page 85 and print the following

instructions.

Note:

Do not remove the base cover assembly when your computer is connected to ac power. Otherwise, there

might be a risk of short circuits.

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 nano-SIM-card tray if your computer comes with one. See “Connect to a cellular network”

on page 13.

4. Turn the computer over.

T490, T590, P43s, and P53s User Guide