• Scenario 2: both LEDs are on, access the drive information on XCC:
– If the information is accessible but the drive remains de-asserted, replace the drive or check RAID
chip log in FFDC file to see if any helpful information is available.
– If the information is not accessible, check RAID chip log in FFDC file, replace the interposer or
drive.
3. If the problem persists after replacing the interposer and drive, contact Lenovo Support.
LEDs on the rear M.2 backplane
Figure 26. Rear M.2 backplane LEDs
The normal status of the LEDs on the backplane is that both system heartbeat LED and PSoC heartbeat LED
blink.
LED
Status and description
1 System
heartbeat LED
(green)
Blinking: The M.2 backplane has power on.
2 PSoC
heartbeat LED
(green)
On: The PSoC firmware is not initialized or in a hung state.
Off: Power off or in a hung state.
Fast blinking (about one flash per second): Updating code (bootloader mode).
Slow blinking (about one flash every two seconds): Exiting initialization (application mode).
Rear M.2 drive backplane troubleshooting procedure
• Visually inspect the LEDs on the backplane, with system power on and top cover removed.
– If the PSoC heartbeat LED is always on or off, replace the backplane. If the problem persists after
replacing, collect FFDC file and contact Lenovo Support.
– If the system heartbeat LED is not blinking, it indicates that RAID chip problems occur. Replace the
backplane. If the problem persists after replacing, collect FFDC file and contact Lenovo Support.
• If XCC event log shows PCIe errors concerning the rear M.2 drive and removing the top cover is not
feasible.
– Replace the backplane. If the problem persists after replacing, collect FFDC file and contact Lenovo
Support.
– Check PSoC register in the PSoC folder to further identify if PSoC is working normally:
– If not, try to replace the backplane or update PSoC firmware. If they do not work, contact Lenovo
Support.
Chapter 2. Server components 47
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