Power system checkout
To verify if a battery and power adapter are functional, do the following:
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power adapter is functional.
4. Turn off the computer.
5. Disconnect the ac adapter and turn on the computer. If the computer can be turned on, it means the battery is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the ac power adapter”
“Checking the battery and operational charging”
“Checking the coin-cell battery”
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
If the system-status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration.
1. Turn off the computer.
2. Connect the ac power adapter.
3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac power adapter is functional.
4. Turn off the computer.
5. Disconnect the ac adapter and turn on the computer. If the computer can be turned on, it means the battery is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the ac power adapter”
“Checking the battery and operational charging”
“Checking the coin-cell battery”
Checking the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
If the system-status indicator does not blink three times when an ac power source is connected, check the power cord of the ac power adapter for correct continuity and installation.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable. See the following illustration.
Note: Output voltage of pin 2 of the ac power adapter might differ
from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a
defect.
Checking the battery and operational
charging
Checking the battery
For the 7 operating system: Double-click the battery gauge icon in the right side of the task bar to open the Power Manager program and then click the Battery tab.
For 8.1: Open the Lenovo Support program and click Battery Health, or open the Lenovo Settings program and click Power.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Perform operational charging. Click the battery status icon in the Windows notification area to display detailed battery information. If it indicates that the battery is not charging, replace the battery.
3. Check the battery status again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery.
2. Remove the coin-cell battery.
3. Measure the voltage of the coin-cell battery. See the following illustration.
If
the voltage is correct, replace the system board.Checking the battery
For the 7 operating system: Double-click the battery gauge icon in the right side of the task bar to open the Power Manager program and then click the Battery tab.
For 8.1: Open the Lenovo Support program and click Battery Health, or open the Lenovo Settings program and click Power.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
2. Perform operational charging. Click the battery status icon in the Windows notification area to display detailed battery information. If it indicates that the battery is not charging, replace the battery.
3. Check the battery status again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery.
2. Remove the coin-cell battery.
3. Measure the voltage of the coin-cell battery. See the following illustration.
If the voltage is not correct, replace the coin-cell battery.
If the coin-cell battery discharges quickly after replacement, replace the system board.
If the coin-cell battery discharges quickly after replacement, replace the system board.
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 ac power.
2. Disable the built-in battery.
3. Remove the bottom cover.
4. Remove the coin-cell battery and wait for a few seconds.
5. Reinstall the coin-call battery.
6. Reinstall the bottom cover.
7. Reconnect ac power.
8. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does not appear. The power-on password has been removed.
If a supervisor 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 ThinkPad logo is displayed, 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 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
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 ac power.
2. Disable the built-in battery.
3. Remove the bottom cover.
4. Remove the coin-cell battery and wait for a few seconds.
5. Reinstall the coin-call battery.
6. Reinstall the bottom cover.
7. Reconnect ac power.
8. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does not appear. The power-on password has been removed.
If a supervisor 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 ThinkPad logo is displayed, 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 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.
The power-on password has been removed.
How to remove the hard disk password
To remove a user hard disk password that has been forgotten, when the supervisor password and master hard disk password are known, do the following:
1. Turn on the computer.
2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program. When the power-on password icon is displayed on the screen, enter either the power-on password or the supervisor password.
3. When the user hard disk password icon is displayed on the screen, press F1. The master hard disk password icon is displayed.
4. Enter the master hard disk password to enter the ThinkPad Setup program.
5. Select Security.
6. Select Password.
7. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
8. Select Master hard disk password.
9. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice.
10. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the master hard disk password have been removed.
To remove a user hard disk password that has been forgotten, when the supervisor password and master hard disk password are known, do the following:
1. Turn on the computer.
2. When the ThinkPad logo comes up, immediately press F1 to enter the ThinkPad Setup program. When the power-on password icon is displayed on the screen, enter either the power-on password or the supervisor password.
3. When the user hard disk password icon is displayed on the screen, press F1. The master hard disk password icon is displayed.
4. Enter the master hard disk password to enter the ThinkPad Setup program.
5. Select Security.
6. Select Password.
7. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
8. Select Master hard disk password.
9. Type the current master hard disk password in the Enter Current Password field. Then leave the Enter New Password field blank, and press Enter twice.
10. Press F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the master hard disk password have been removed.
