IBM X3950 X5 Problem Determination And Service Manual page 80

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 4, "Parts listing, Types 7145, 7146, 7143, and 7191," on page 81 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.
Light path
diagnostics LED Description
LINK There is a fault in a QPI port or the
QPI scalability cables.
Note:
1. This LED remains lit until the
2. If a fault occurs, the SMP
PS A power supply has failed or has
been removed.
Note: In a redundant power
configuration, the dc power LED on
one power supply might be off.
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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
problem is solved and the server
is turned off and restarted.
Expansion Port link LED on the
failed port is off.
Action
1. If the CNFG LED is also lit, make sure that your
QPI wrap cards or QPI scalability cables are
installed and in the proper sequence.
2. If a memory expansion module is attached to the
server, check to determine whether the front LINK
error LED is lit on the memory expansion module
or the server. The LED that is lit determines which
device you should troubleshoot.
3. Check the QPI port link LEDs to find the failing
port or cable. (The rear LED on the failing port or
cable is off.)
4. Reseat the QPI wrap cards or the QPI scalability
cables (if installed).
Attention: Do not disconnect or connect any of
the cables when the server or memory expansion
module is connected to power.
5. Replace the QPI wrap cards or the QPI scalability
cables (if installed).
Attention: Do not disconnect or connect any of
the cables when the server or memory expansion
module is connected to power.
6. (Trained service technician only) Replace the I/O
board (see "Removing the I/O-board shuttle" on
page 143 and "Replacing the I/O-board shuttle" on
page 144).
1. If a memory expansion module is attached to the
server, check to determine whether the front PS
error LED is lit on the memory expansion module
or the server. The LED that is lit determines which
device you should troubleshoot.
2. Reinstall the removed power supply (see
"Replacing the hot-swap power supply" on page
127).
3. Check the individual power-supply LEDs to find
the failing power supply (see "Rear view LEDs" on
page 17).
4. Reseat the failing power supply (see "Removing a
hot-swap power supply" on page 123 and
"Replacing the hot-swap power supply" on page
127).
5. Make sure that the power cord is fully seated in
the power-supply inlet and the ac power source.
6. Replace the power supply.