Lenovo x3550 M4, Installation And Service Manual

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Table 14. Light path diagnostics panel LEDs (continued)
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(trained technician only)," that step must be performed only by a trained
technician.
LED Description Action
When only the CPU LED is lit, a
microprocessor has failed. If the CONFIG LED is not lit, a microprocessor failure occurs,
complete the following steps:
1. (Trained technician only) Make sure that the failing
microprocessor and its heat sink, which are indicated by a
lit LED on the system board, are installed correctly. See
“Replacing a microprocessor and heat sink” on page 290
for information about installation and requirements.
2. (Trained technician only) Replace the failing microprocessor
(see “Removing a microprocessor and heat sink” on page
285 and “Replacing a microprocessor and heat sink” on
page 290).
3. For more information, go to
http://www.ibm.com/support/entry/portal/docdisplay?
lndocid=SERV-CALL.
CPU
CPU + CONFIG When both
the CPU LED and the CONFIG
LED are lit, the microprocessor
configuration is invalid. If the CONFIG LED and the CPU LED are lit, the system issues
an invalid microprocessor configuration error. Complete the
following steps to correct the problem:
1. Check the microprocessors that were just installed to
make sure that they are compatible with each other (see
“Replacing a microprocessor and heat sink” on page
290 for additional information about microprocessor
requirements).
2. (Trained technician only) Replace the incompatible
microprocessor.
3. Check the system-error logs for information about the
error. Replace any component that is identified in the error
log.
When only the MEM LED is lit, a
memory error has occurred. Note: Each time you install or remove a DIMM, you must
disconnect the server from the power source; then, wait 10
seconds before restarting the server.
If the CONFIG LED is not lit, the system might detect a memory
error. Complete the following steps to correct the problem:
1. Update the server firmware to the latest level (see
“Updating the firmware” on page 93).
2. Reseat or swap the DIMMs with lit LED.
3. Check the system-event log in the Setup utility or IMM
error messages. Follow steps indicated in Appendix
B “UEFI/POST diagnostic codes” on page 791 and
Appendix A “Integrated management module II (IMM2)
error messages” on page 309.
4. Replace the failing DIMM (see “Removing a memory
module” on page 213 and “Installing a memory module”
on page 45).
MEM
MEM + CONFIG When both the
MEM and CONFIG LEDs are If the MEM LED and the CONFIG LED are lit, check the
system-event log in the Setup utility or IMM2 error messages.
Chapter 4
.
Troubleshooting
127