Microprocessor Problems - IBM X3950 X5 Problem Determination And Service Manual

Microprocessor problems

This topic explores a list of possible solutions for problems with the primary
microprocessor on the server.
About this task
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.
Symptom
The server does not function
after replacing the primary
microprocessor or the primary
microprocessor error LED is lit.
Action
1. Correct any errors that are indicated by the light path diagnostics LEDs (see
"Light path diagnostics" on page 57).
2. Make sure that the server supports all the microprocessors and that the
microprocessors match in speed and cache size.
3. Reseat the following components:
a. Microprocessor 1 (see "Removing a microprocessor and heat sink" on page
161)
b. (Trained service technician only) Microprocessor board (see "Removing the
microprocessor-board assembly" on page 171 and "Replacing the
microprocessor-board assembly" on page 173)
4. (Trained service technician only) If there is no indication of which
microprocessor has failed, isolate the error by testing with one microprocessor
at a time.
5. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. (Trained service technician only) Microprocessor 1
b. (Trained service technician only) Microprocessor board
6. (Trained service technician only) If multiple error codes or light path
diagnostics LEDs indicate a microprocessor error, reverse the locations of two
microprocessors to determine whether the error is associated with a
microprocessor or with a microprocessor socket.
v (Trained service technician only) If the error is associated with a
microprocessor, replace the microprocessor.
v (Trained service technician only) If the error is associated with a
microprocessor socket, replace the microprocessor board.
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Chapter 3. Diagnostics