Sunday, March 13, 2016

LENOVO LAPTOP – Lenovo ThinkPad X131e – Battery charger Test procedure – How to test the battery back – How to replace the BIOS battery – How reset the HDD password – Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • How to check the AC adapter 
  • How to check the battery pack
  • How to reset the HDD password 




Lenovo ThinkPad X131e

Power system checkout
To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
# “Checking the ac power adapter”
# “Checking operational charging”
# “Checking the battery pack”
# “Checking the backup battery”
How to Check the ac power adapter
You are here because the computer fails only when the ac power adapter is used.
# 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 adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the following figure

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 adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac adapter does not always indicate a defect.
How to Check operational charging
To check whether the battery charges correctly 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, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still 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 topic.
How to Check 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.
Note: If the battery pack become shot, 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:

# If the voltage is less than +11.0 V dc, the battery pack has been discharged.
Note: Recharging will take at least 3 hours, even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery.
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.
How to Check the backup battery
Do the following:
1. Power off the computer, and unplug the ac adapter from it.
2. Turn the computer upside down.
3. Remove the battery pack
4. Remove the backup battery
5. Measure the voltage of the backup battery. See the following figure:

# 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.
How to remove the hard – disk password
To remove a user hard disk password  that has been forgotten, when the supervisor password and the master hard disk password are known, do the following:
1. Turn on the computer.
2. When theThink Pad logo is displayed, immediately press F1 to enter the Think Pad Setupprogram.
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, where HDP stands for hard disk password.
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 F10 to save changes and exit the ThinkPad Setup program. The user hard disk password and the master hard disk password have been removed