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System-board-assembly LEDs

The following illustrations show the light-emitting diodes (LEDs) on the system board assembly.

Press the power button to light the LEDs on the system board assembly when the power source has been removed from the server.

Figure 1. System-board-assembly LEDs
System-board-assembly LEDs
Table 1. System-board-assembly LEDs
LEDDescriptionAction
1 System error LED (yellow)LED on: an error has been detected on the server. Causes might include one or more of the following errors:

  • The temperature of the server reached the non-critical temperature threshold.

  • The voltage of the server reached the non-critical voltage threshold.

  • A fan has been detected to be running at low speed.

  • The power supply has a critical error.

  • The power supply is not connected to the power.

Check system logs or internal error LEDs to identify the failed part.
2 System ID LED (blue)This LED helps you to visually locate the server.A system ID button with LED is also located on the front of the server. You can press the system ID button to turn on/off or blink the front and rear ID LEDs.
3 XCC heartbeat LED (green)The XCC heartbeat LED helps you identify the XCC status.

  • Blinking (about one flash per second) : XCC is working normally.

  • Blinking at other speeds or always on: XCC is at the initial phase or is working abnormally.

  • Off: XCC is not working.

  • If the XCC heartbeat LED is always off or always on, do the following:

    • If XCC cannot be accessed:

      1. Re-plug the power cord.

      2. Check and ensure that the system I/O board and the firmware and RoT security module are installed correctly. (Trained technician only) Reinstall them if needed.

      3. (Trained technician only) Replace the firmware and RoT security module.

      4. (Trained technician only) Replace the system I/O board.

    • If XCC can be accessed, replace the system I/O board.

  • If the XCC heartbeat LED is always blinking fast over 5 minutes, do the following:

    1. Re-plug the power cord.

    2. Check and ensure that the system I/O board and the firmware and RoT security module are installed correctly. (Trained technician only) Reinstall them if needed.

    3. (Trained technician only) Replace the firmware and RoT security module.

    4. (Trained technician only) Replace the system I/O board.

  • If the XCC heartbeat LED is always blinking slow for over 5 minutes, do the following:

    1. Re-plug the power cord.

    2. Check and ensure that the system I/O board and the firmware and RoT security module are installed correctly. (Trained technician only) Reinstall them if needed.

    3. If the problem remains, contact Lenovo Support.

4 PCH heartbeat LED (green)The PCH heartbeat LED helps you identify the PCH status.

  • Blinking (about one flash per second): system ME is working normally.

  • Off: system ME is not working.

If the PCH heartbeat LED is always off or always on, do the following:

  1. Check and ensure that the system I/O board and the firmware and RoT security module are installed correctly. (Trained technician only) Reinstall them if needed.

  2. Make sure the UEFI firmware has been flashed to the corresponding platform version.

  3. Update UEFI and XCC firmware to latest version.

  4. Check if there is ME error event triggered in system event log. If yes, and the above actions are done, replace the firmware and RoT security module.

  5. (Trained technician only) If it is still not working, replace the processor board.

5 FPGA heartbeat LED (green)The FPGA heartbeat LED helps you identify the FPGA status.

  • Blinking (about one flash per second): FPGA is working normally.

  • On or off: FPGA is not working.

If FPGA heartbeat LED is always off or always on, do the following:

  1. Replace the processor board.

  2. If the problem remains, contact Lenovo Support.

6 Processor 1 error LED (Amber)LED on: an error has occurred to the processor the LED represents.Replace the processor.
7 DIMM 1-32 error LEDs (Amber)LED on: an error has occurred to the DIMM the LED represents.

For more information, see Memory problems.

8 DIMM 33-64 error LEDs (Amber)LED on: an error has occurred to the DIMM the LED represents.

For more information, see Memory problems.

9 Processor 4 error LED (Amber)LED on: an error has occurred to the processor the LED represents.Replace the processor.
10 Fan 1-6 error LED (Amber)LED on: an error has occurred to the fan the LED represents.Replace the fan.
11 Processor 3 error LED (Amber)LED on: an error has occurred to the processor the LED represents.Replace the processor.
12 Processor 2 error LED (Amber)LED on: an error has occurred to the processor the LED represents.Replace the processor.