Checking The Operational Charging; Checking The Coin-Cell Battery; Checking The Ac Power Adapter - Lenovo THINKPAD X1 Tablet Gen 3 Hardware Maintenance Manual

• If the computer cannot be turned on, replace the built-in battery with another one. If the computer 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. See "Disabling the built-in battery" on page 54.
2. Remove the coin-cell battery. See "1110 Coin-cell battery" on page 71.
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

ThinkPad X1 Tablet Gen 3 supports the Lenovo USB-C 45W or 65W AC Adapter and Power Cord. When the
adapter is connected to the computer, 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 computer output voltage request.
When you use the ac power adapter to charge the computer 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 USB-C type ac power adapter, do the following:
1. Connect the computer to a power outlet and turn on the computer.
2. Start the Lenovo Companion program, and then click Hardware Settings ➙ Power. The ac power
adapter information is displayed.
Ensure that you use the USB-C type ac power adapter that is shipped with the computer to provide enough
power to the computer. Otherwise, a message will be displayed, prompting you that the computer will not be
charged or will be charged slowly.
For information about which ac power adapter to order, go to
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black
Ground
https://support.lenovo.com/partslookup
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