Replace A Cru; Keyboard - Lenovo ThinkPad L390 User Manual

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 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.

Keyboard

Prerequisite
Before you start, read Appendix A "Important safety information" on page 65 and print the following
instructions.
Replacement procedure
Note: You might be instructed to slide the keyboard frame forward or backward in some of the following
steps. In this case, ensure that you do not press or hold the keys while sliding the keyboard frame.
Otherwise, the keyboard frame cannot be moved.
1. Disable the built-in battery. See "Disable Fast Startup and the built-in battery" on page 43.
2. Turn off the computer and disconnect the computer from ac power and all connected cables.
3. Turn the computer over and open the display. Take the tool out of the new keyboard package. Insert the
tabs a and b into the slot between the TrackPoint buttons and the trackpad
downward 2 to release the left and right Trackpoint buttons. Then remove the two Trackpoint buttons
3 .
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L390, L390 Yoga, S2 4th Gen, and S2 Yoga 4th Gen User Guide
1 . Slightly pivot the tool