Thursday, April 07, 2016

Lenovo ThinkPad Twist S230u – How to test the AC adapter voltage – How to check the battery pack – How to check the backup battery – factory default setting – How to remove passwords – Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • How to test the battery pack 
  • How to test the AC adapter  
  • How to reset the passwords 

Lenovo ThinkPad Twist S230u

Power system checkout
To verify a symptom, do the following:
1. Connect the ac power adapter and turn on the computer.
2. Check that power is supplied when you turn on the computer.
3. Insert a straightened paper clip into the emergency reset hole to reset the computer. Confirm the
system is still powered on.
4. Turn off the computer and disconnect the ac power adapter.
5. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
“Checking the ac power adapter”
“Checking operational charging”
“Checking the battery pack”
“Checking the backup battery”
Checking the ac power adapter
If the computer fails only when the ac power adapter is used, do the following:
If the power-on indicator does not turn on, 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 across 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 operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.
Perform operational charging. If the battery status indicator or icon does not turn on, replace the battery pack.
If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section.
Checking the battery pack
The battery status icon in the Windows notification area displays the percentage of battery power remaining.
To check for detailed battery status information, do the following:
For 7: Open the Power Manager program and click the Battery tab.
For 8: Open the Lenovo Support program and click Battery Health, or open the Lenovo Settings program and click Power.
Checking the backup battery
To check the backup battery, do the following:
1. Disable the built-in battery. See “Disabling the built-in battery” on page 60.
2. Remove the backup battery).
3. Measure the voltage of the backup battery. See the following illustration
If the voltage is correct, replace the system board
If the voltage is not correct, replace the backup battery.
If the backup battery discharges quickly after replacement, replace the system board.
Refreshing your computer
If your computer does not perform well and the problem might be caused by a recently installed program, you can refresh your computer without losing your personal files or changing your settings.
Attention: If you refresh your computer, the programs that came with your computer and the programs that you installed from Windows Store will be reinstalled, but all other programs will be removed.
To refresh your computer, do the following:
1. Move your cursor to the top-right or bottom-right corner of the screen to display the charms. Click Settings > Change PC settings > General.
2. In the Refresh your PC without affecting your files section, click Get started.
3. Follow the instructions on the screen to refresh your computer.
Resetting your computer to the factory default settings
If you want to recycle your computer or just start over, you can reset your computer to the factory default settings. Resetting the computer will reinstall the operating system, reinstall all the programs that came with your computer, and reset all the settings to the factory default settings.
Attention: If you reset the computer to the factory default settings, all your personal files and settings will be deleted. To avoid data loss, make a backup copy of all the data that you want to keep. To reset your computer to the factory default settings, do the following:
1. Move your cursor to the top-right or bottom-right corner of the screen to display the charms. Click Settings >  Change PC settings >  General.
2. In the Remove everything and reinstall Windows section, click Get started. Then click Next to confirm the operation.
3. Depending on your needs, do one of the following:
To perform a quick format, click Just remove my files to start the process. The process will take several minutes.
To perform a complete format, click Fully clean the drive to start the process. The process will take several hours.
4. Follow the instructions on the screen to reset your computer to the factory default settings.
How to remove the power-on password
If no supervisor password has been set, do the following to remove the power-on password:
1. Disable the built-in battery.
2. Remove the backup battery.
3. Connect the ac power adapter and turn on the computer. Wait until the POST ends. After the POST ends, the password prompt does not appear. The power-on password has been removed.
4. Disable the built-in battery, and then reinstall the backup battery.
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 Fn+F10 to save changes and exit the ThinkPad Setup program.
How to remove the hard disk password
To remove a user hard disk password that has been forgotten, when the 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 ThinkPad Setup.
3. Select Security.
4. Select Password.
5. Select Hard-disk x password, where x is the letter of the hard disk drive. A pop-up window opens.
6. Select Master HDP.
7. 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.
8. Press Fn+F10 to save changes and exit the ThinkPad Setup program.
9. Select Yes in the Setup Notice window. Both the user hard disk password and master hard disk password will be removed.