Sunday, March 27, 2016

Lenovo ThinkPad X1 Tablet – AC adapter test procedure – Backup battery test procedure – how to check the internal battery – Resetting the tablet - Laptop repair and service

Category: Laptop Repair and Service 

Contents of this article 

  • How to test the AC adapter
  • How to test the backup battrey
  • How to reset the tablet 

Lenovo ThinkPad X1 Tablet

Power system checkout
To verify a symptom, do the following:
1. Turn off the tablet.
2. Connect the ac power adapter.
3. Turn on the tablet. If the tablet can be turned on, it means that either the battery or the ac power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the tablet. If the tablet is still powered on, it means that the ac power adapter is functional.
5. Turn off the tablet.
6. Disconnect the ac power adapter and turn on the tablet. If the tablet can be turned on, it means that the battery is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
# “Checking the built-in battery”
# “Checking the operational charging”
# “Checking the coin-cell battery”
# “Checking the ac power adapter”
Checking the built-in battery
This tablet 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 or a battery designed for another system is installed, the system will
not charge.
If the tablet cannot start, do the following to check whether the built-in battery is failed:
1. Ensure that the tablet failure is not caused by exhausted battery power.
2. Reset the tablet by inserting a straightened paper clip into the emergency reset hole. Then press the power button. If the tablet cannot be turned on, continue with the next step.
3. Clear Complementary Metal Oxide Semiconductor (CMOS) by disconnecting the ac power adapter, coin-cell battery, and built-in battery.
4. Connect the built-in battery and ac power adapter, and then press the power button.
# If the tablet can be turned on, disconnect the ac power adapter from the tablet. If the tablet turns off, it means that the built-in battery fails.
# If the tablet cannot be turned on, replace the built-in battery with another one. If the tablet can be turned on with the new battery installed, it means that the original battery fails.
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. Tap or 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 internal battery pack
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.
# If the voltage is not correct, replace the coin-cell battery.
# If the coin-cell battery discharges quickly after replacement, replace the system board.
Checking the ac power adapter
This tablet supports only the Lenovo USB-C 45W AC Adapter. When the adapter is connected to the tablet, the output voltage at the adapter plug rises from 0 V (when not connected) to 5 V. Then the power delivery communication starts. The ac power adapter outputs 20 V according to the tablet output voltage request. When you use the ac power adapter to charge the tablet but no power is charged, see the instructions in this topic to check the ac power adapter.
Note: Noise from the ac power adapter does not always indicate a defect.
To check the ac power adapter when the tablet does not charge, do the following:
1. Disconnect the ac power adapter from the tablet.
2. Connect a new ac power adapter to the tablet.
3. If the tablet charges, replace the ac power adapter
Resetting your tablet
If your tablet does not perform well, you might consider resetting your tablet. In the resetting process, you can choose to keep your files or remove them, and then reinstall the Windows operating system. To refresh your tablet, do the following:
Note: The graphical user interface (GUI) items of the operating system might change without notice.
1. Open the Start menu . Tap Settings > Update & security > Recovery.
Note: Settings might not be displayed in the Start menu. In this case, tap All apps to find Settings.
2. In the Reset this PC section, tap Get started.
3. Follow the instructions on the screen to refresh your tablet.