Power System Checkout; Checking The Ac Power Adapter; Checking The Removable Battery And The Operational Charging - Lenovo ThinkPad T470 Hardware Maintenance Manual

3. Restart the computer.
4. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu
window opens, release the F12 key.
5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program
will be launched automatically.
6. Follow the instructions on the screen to use the diagnostic program.

Power system checkout

To verify if a battery or an ac power adapter is functional, 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 ac power adapter" on page 27
• "Checking the removable battery and the operational charging" on page 27
• "Checking the coin-cell battery" on page 28

Checking the ac power adapter

Ensure that you use the ac power adapter that is shipped with the computer to provide enough power
to the computer.
Note: Noise from the ac power adapter does not always indicate a defect.
To check the ac power adapter, do the following:
1. Connect the computer to a power outlet and turn on the computer.
2. Check the adapter status from the following Lenovo programs:
• For Windows 10: Open the Lenovo Settings program and click Power.
• For Windows 7: Open the Power Manager program and click Battery.
If the ac power adapter is working well, adapter information will be displayed on the screen. If a
message is displayed warning that the power supply is not enough, replace the adapter with a proper
one that is supported by the computer. If you do not see any information about the adapter, replace
the adapter with a new one.
If the ac power adapter is working but the computer does not charge during operation, go to "Checking the
removable battery and the operational charging" on page 27.

Checking the removable battery and the operational charging

Checking the removable battery
This system 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.
.
Chapter 3 General checkout
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