Power System Checkout; Checking The Built-In Battery And Operational Charging - Lenovo ThinkPad Helix 20CG Hardware Maintenance Manual

• 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 33 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 and operational charging" on page 26
• "Checking the coin-cell battery" on page 27
• "Checking the ac power adapter" on page 27

Checking the built-in battery and operational charging

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 systems 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.
The battery status icon in the Windows
power.
To check for detailed battery status information, open the Lenovo Settings program and tap Power.
To check whether the battery charges properly during operation, do the following:
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 inserting a straightened paper clip into
the emergency reset hole and tapping the Windows Start-screen control at the same time.
4. Press the power button. If the tablet cannot be turned on, continue with the next step.
5. Connect the ac power adapter and press the power button.
• If the tablet is turned on, disconnect the ac power adapter from the tablet. If the tablet turns off, it
means that the built-in battery fails.
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ThinkPad Helix Hardware Maintenance Manual
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notification area displays the percentage of the remaining battery