Lenovo 21BX001LGE, Hardware Maintenance Manual

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UEFI diagnostic program
A UEFI diagnostic program is preinstalled on the computer. This program enables you to view system
information and test some hardware devices in your computer, such as memory, storage devices, the LCD,
and system board buses.
To run the UEFI diagnostic program, do the following:
1. Turn on the computer. If the computer cannot be turned on, go to “Power system checkout” on page 25,
and check the power sources. If an error code is displayed, go to “Symptom-to-FRU index” on page 30
for error code descriptions and troubleshooting hints.
2. When the logo screen is displayed, repeatedly press and release the F10 key. The main screen of the
UEFI diagnostic program is displayed.
3. Follow the instructions on the screen to use the program.
The following table displays the main items of the UEFI diagnostic program. Depending on the model, the
items might differ slightly.
Table 1. Items on the main screen of the UEFI diagnostic program
Tests Tools
• Storage
• Memory
• CPU
• Motherboard
• PCI Express • System information
• Bad Block recovery
• Smart information
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 25
• “Checking the built-in battery and operational charging” on page 26
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 26.
Notes:
Chapter 3
.
General checkout
25