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Note: Depending on the model, your server might look slightly different from the illustrations in this topic.
The server is designed so that LEDs remain lit when the server is connected to an ac power source but is
not turned on, provided that the power supply is operating correctly. This helps you to isolate problems
when the server is not turned on. Many errors are rst indicated by a lit error LED on the diagnostic panel
of the server. If an LED is lit, one or more LEDs elsewhere in the server might also be lit to direct you to
the source of the error.
The following illustration shows the TMM status LED and system fan error LEDs on the system board.
Figure 34. System board LEDs
1 TMM status LED (also known as BMC status LED)
This LED indicates the status of the onboard ThinkServer Management Module (TMM, also known as BMC).
TMM status LED
Color
Description
On Green
The TMM is not ready.
Off
None
The TMM has no power or has failed.
Blinking
Green
The TMM is working.
2 - 7 System fan error LEDs
When a system fan error LED on the system board is lit, it indicates that the corresponding system fan is
operating slowly or has failed. To solve the problem, you might need to reinstall or replace the system fan.
See “Replacing a system fan” on page 148
. If it is a system board problem, contact the Lenovo Customer
Support Center.
50 ThinkServer User Guide