Prerequisite
Before you start, read Generic Safety and Compliance Notices and print the following instructions.
Note: Do not remove
the base cover assembly in the following situations. Otherwise, there
might be a risk of short circuits.
When your computer has the removable battery installed
When your computer is connected to ac power
For access, do the following:
Disable the built-in battery. See Disable Fast Startup and the built-in battery.
Turn off the computer and disconnect the computer from ac power and all connected cables.
Close the computer display.
Remove the nano-SIM-card tray if your computer comes with one. See Connect to a cellular network (for selected models).
Turn the computer over.
Removal procedure
Installation procedure
Troubleshooting
If the computer does not start up after you reinstall the base cover assembly, disconnect the ac power adapter and then reconnect it to the computer.