How To Remove The Power-On Password - Lenovo ThinkPad L590 Hardware Maintenance Manual

You can enable the system management password to have the same authority as the supervisor password
to control security related features. To customize the authority of the system management password through
the UEFI BIOS menu:
1. Enter the UEFI BIOS menu.
Note: When you are prompted by the icon
password has been set, or enter the correct system management password if no supervisor password
has been set. Otherwise, you cannot change the configurations in the following steps.
2. Select Security ➙ Password ➙ System Management Password Access Control.
3. Follow the on-screen instructions.
If you have set both the supervisor password and the system management password, the supervisor
password overrides the system management password. If you have set both the system management
password and the power-on password, the system management password overrides the power-on
password.

How to remove the power-on password

To remove a power-on password, do the following:
If no supervisor password has been set, do the following to remove the power-on password:
1. Turn off the computer and disconnect the ac power.
2. Disable the built-in battery. See "Disabling the built-in battery" on page 66.
3. Remove the base cover assembly. See "1020 Base cover assembly" on page 70.
4. Remove the built-in battery. For instructions on how to remove the built-in battery, see "1120 Built-in
battery" on page 87.
5. Remove the coin-cell battery. For instructions on how to remove the coin-cell battery, see "1130 Coin-
cell battery" on page 89. Wait for a few seconds.
6. Reinstall the coin-cell battery. For instructions on how to install the coin-cell battery, see "1130 Coin-cell
battery" on page 89.
7. Reinstall the built-in battery. For instructions on how to install the built-in battery, see "1120 Built-in
battery" on page 87.
8. Turn on the computer and wait until the power-on self-test (POST) ends. After the POST ends, the
password prompt does not appear. The power-on password has been removed.
If a supervisor password or a system management password has been set and is known to the service
technician, do the following to remove the power-on password:
1. Turn on the computer.
2. When the logo screen comes up, immediately press F1.
3. Type the supervisor password to enter the ThinkPad Setup program.
4. Select Security.
5. Select Password.
6. Select Power-On Password.
7. Type the current supervisor password or the system management password in the Enter Current
Password field. then leave the Enter New Password field blank, and press Enter twice.
8. In the Changes have been saved window, press Enter.
9. Press F10 to save changes and exit the ThinkPad Setup program.
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L490 and L590 Hardware Maintenance Manual
, enter the correct supervisor password if a supervisor