Table 34. System-board-assembly LEDs (continued)
LED
Description
Action
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 access:
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 access, 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 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.
472 ThinkSystem SR650 V3 User Guide
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