Power System Checkout; Checking The Built-In Battery - Lenovo THINKPAD X1 Tablet Gen 3 Hardware Maintenance Manual

Notes:
• If the computer cannot be turned on, go to "Power system checkout" on page 28, and check the
power sources.
• If an error code is displayed, go to "Symptom-to-FRU index" on page 33 for error code descriptions
and troubleshooting hints.
3. Press F12 and follow the instructions to start the computer from the bootable diagnostic medium.
4. Follow the instructions on the screen to use the diagnostic program.

Power system checkout

To verify a symptom, 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 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 is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
• "Checking the built-in battery" on page 28
• "Checking the operational charging" on page 29
• "Checking the coin-cell battery" on page 29
• "Checking the ac power adapter" on page 29

Checking the built-in battery

This computer 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.
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.
Tap or click the battery-status icon in the Windows notification area to check the battery status. The battery-
status icon displays the percentage of battery power remaining and how long you can use your computer
before you must charge the battery.
If the computer cannot start, do the following to check whether the built-in battery is failed:
1. Ensure that the computer failure is not caused by exhausted battery power.
2. Reset the computer by inserting a straightened paper clip into the emergency reset hole. Then press the
power button. If the computer 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. See "1110 Coin-cell battery" on page 71 and "1030 Built-in
battery" on page 63.
4. Connect the built-in battery and ac power adapter, and then press the power button.
• If the computer can be turned on, disconnect the ac power adapter from the computer. If the
computer turns off, it means that the built-in battery fails.
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X1 Tablet Gen 3 Hardware Maintenance Manual