Power System Checkout; Checking The Ac Power Adapter - Lenovo K14 Gen 1 Hardware Maintenance Manual

1. Go to
https://www.lenovo.com/diags
2. Click Lenovo Bootable Diagnostics.
3. Follow the instructions on the Web site to create a bootable diagnostic medium on a USB device or disc.
To use the diagnostic medium you have created, do one of the following:
• If you have created the bootable diagnostic medium on a USB device, do the following:
1. Attach the USB device to the computer.
2. Turn on the computer. If the computer 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. When the logo screen is displayed, repeatedly press and release the F12 key. When the Boot Menu
window opens, release the F12 key.
4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program launches.
5. Follow the instructions on the screen to use the diagnostic program.
• If you have created the bootable diagnostic medium using a disc, do the following:
1. Turn on the computer. If the computer 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.
2. Insert the disc into the optical drive.
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
launches.
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. Remove the built-in battery.
3. Connect the ac power adapter. If the computer can be turned on, it means the ac power adapter is
functional.
4. Turn off the computer.
5. Disconnect the ac power adapter and install the charged built-in battery.
6. Turn on the computer. If the computer can be turned on, it means that the built-in 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 26
• "Checking the built-in battery and operational charging" on page 27
• "Checking the coin-cell battery" on page 27

Checking the ac power adapter

If the computer fails only when the ac power adapter is used:
• If the power problem occurs only when the docking station or the port replicator is used, replace the
docking station or the port replicator.
• If the system status indicator does not blink three times when an ac power source is connected, check the
power cord of the ac power adapter for correct continuity and installation.
• If the computer does not charge during operation, go to "Checking the built-in battery and operational
charging" on page 27.
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