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System-I/O-board LEDs

The following illustrations show the light-emitting diodes (LEDs) on the system I/O board, also known as Datacenter Secure Control Module (DC-SCM).

Figure 1. LEDs on the system I/O board
LEDs on the system I/O board

1 AP0 LED (green)

2 AP1 LED (green)

3 RoT fault LED (yellow)

4 System error LED (yellow)

5 System ID LED (blue)

6 XCC heartbeat LED (green)

7 SCM FPGA heartbeat LED (green)

Table 1. LEDs description
Scenario1 AP0 LED2 AP1 LED3 RoT fault LED7 SCM FPGA heartbeat LED6 XCC heartbeat LEDActions
RoT security module fatal firmware failureOffOffOnN/AN/AReplace the system I/O board.
BlinkN/AOnN/AN/AReplace the system I/O board.
BlinkN/AOnOnN/AReplace the system I/O board.
No system power (FPGA heartbeat LED off)OffOffOffOffOffIf the AC power is on, but the system board assembly does not have power, then:

  1. Check the power supply unit (PSU) or power interposer board (PIB) if any. If the PSU or PIB has any error, replace it.

  2. If the PSU or PIB is good, do the following:

    1. Replace the system I/O board.

    2. Replace the processor board.

XCC firmware recoverable errorBlinkN/AOffN/AN/AInformation only. No action is required.
XCC firmware is recovered from errorBlinkN/AOffN/AN/AInformation only. No action is required.
UEFI firmware authentication failureN/ABlinkOffN/AN/AInformation only. No action is required.
UEFI firmware is recovered from authentication failureN/AOnOffN/AN/AInformation only. No action is required.
System is OK (FPGA heartbeat LED is On)OnOnOffOnOnInformation only. No action is required.

4 System error LED (yellow)

DescriptionWhen this yellow LED is lit, another one or more LEDs in the server might also be lit to direct you to the error source.
ActionCheck system logs or internal error LEDs to identify the failed part. For more information, see Front-operator-panel LEDs and buttons.

5 System ID LED (blue)

DescriptionThe front system ID LED helps you locate the server.
ActionEach time you press the system ID button, the state of both system ID LEDs changes, and the state can be on, blinking, or off.

6 XCC heartbeat LED (green)

DescriptionThe 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.

Action

  • 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 is installed correctly. (Trained technicians only) Reinstall it if needed.

      3. (Trained technicians 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 is installed correctly. (Trained technicians only) Reinstall it if needed.

    3. (Trained technicians only) Replace the system I/O board.

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

    1. Re-plug the power cord.

    2. Check and ensure that the system I/O board is installed correctly. (Trained technicians only) Reinstall it if needed.

    3. If the problem remains, contact Lenovo Support.