IBM System x3950, Problem Determination And Service Manual

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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See Chapter 3, “Parts listing, Type 8878 and 8879,” on page 109 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED with
the system-error or
system-information
LED also lit Description Action
CPU A microprocessor has failed, is
missing, or has been improperly
installed.
Note: Make sure that the
microprocessors are installed in the
correct sequence; see “Removing
and installing a microprocessor” on
page 141.
1. Check the BMC log or the system-error log to
determine the reason for the lit LED.
2. Find the failing, missing, or mismatched
microprocessor by checking the LEDs on the
microprocessor tray.
3. Reseat the following components:
a. (Trained service technician only) Failing
microprocessor
b. Microprocessor tray
4. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. (Trained service technician only) Failing
microprocessor
b. (Trained service technician only)
Microprocessor tray
VRM A dc-dc regulator has failed or is
missing.
1. Check the BMC log or the system-error log to
determine the reason for the lit LED (for a VRM).
2. Find the failing or missing VRM by checking the
LEDs on the microprocessor tray.
3. Install any missing VRMs.
4. Reseat the following components:
a. Failing VRM
b. (Trained service technician only)
Microprocessor associated with the VRM
c. Microprocessor tray
5. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. Failing VRM
b. (Trained service technician only)
Microprocessor associated with the VRM
c. (Trained service technician only)
Microprocessor tray
LOG Information is present in the BMC
log and system-error log. One or
both logs might be full or almost full.
1. Save the log if necessary and clear it (see Error
Logs at “Configuration/Setup Utility menu choices”
on page 153).
2. Check the log for possible errors (see “Error logs”
on page 19).
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IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide