Power System Checkout; Checking The Built-In Battery - Lenovo ThinkPad X1 Hardware Maintenance Manual

2. Restart the tablet. When the logo screen is displayed, tap To interrupt normal startup, press Enter
or tap here on the screen.
Notes:
• If the tablet cannot be turned on, go to "Power system checkout" on page 26, and check the
power sources.
• If an error code is displayed, go to "Symptom-to-FRU index" on page 31 for error code descriptions
and troubleshooting hints.
3. Tap F12 on the screen and follow the instructions to start the tablet 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 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" on page 26
• "Checking the operational charging" on page 27
• "Checking the coin-cell battery" on page 27
• "Checking the ac power adapter" on page 27

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.
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 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. See "1030 Coin-cell battery" on page 58 and "1160 Built-in
battery" on page 74.
26
ThinkPad X1 Tablet Hardware Maintenance Manual