Tuesday, April 12, 2016

Lenovo Thinkpad x240 – How to reset the laptop to factory default setting – How to check the battery pack voltage – How to check the battery charging adapter – Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • How to refresh and restore 
  • How to check the battery pack
  • How to check the backup battery 

Lenovo Thinkpad x240

Refreshing the 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.
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 the 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
Power system checkout
To verify if the battery packs and the 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 pack or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it means that the battery pack is functional.
If you suspect that the power problem is caused by a specific power device, refer to the appropriate
checkout item in the following list:
“Checking the ac power adapter”
“Checking 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 (the indicator in the ThinkPad logo or the indicator in the center of the power button) 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
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 operational charging
To check whether the batteries charge properly during operation, do the following:
1. Discharge the batteries until the remaining battery power is less than 50%.
2. Connect the computer to ac power to charge the batteries. If the battery status icon in the Windows notification area indicates that the batteries are not charging, remove the batteries and let them return to room temperature.
3. Reinstall the batteries. If the batteries are still not charging, replace the batteries.
4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the external battery pack
This system supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized builder. The system does not support unauthorized batteries or batteries designed for other systems. If an unauthorized battery pack or a battery pack designed for another system is installed, the system will not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use. 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 operating system: Open the Power Manager program and click the Battery tab.
For 8 operating system:
Open the Lenovo Settings program and click Power.
Open the Lenovo Support program and click Battery Health.
Note: If the battery pack becomes hot, it may not be able to charge. Remove it from the computer and leave
it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the
following figure:
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
If the voltage is still less than +11.0 V dc after recharging, replace the battery pack.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7.
The resistance must be 4 to 30 K Ω. If the resistance is not correct, replace the battery pack. If the
resistance is correct, 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.
If the voltage is correct, replace the system board.
If the voltage is not correct, replace the coin-cell battery.
If the coin-cell battery discharges quickly after replacement, replace the system board.