IBM LS20 - BladeCenter - 8850, Service Manual

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Power problems
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 8850,” on page 53 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 Action
Power switch does not work
and reset button, if supported,
does work.
1. Reseat the control-panel connector.
2. Replace the bezel assembly.
3. (Trained service technician only) Replace the system board assembly.
The blade server does not turn
on.
1. Make sure that:
a. The power LED on the front of the BladeCenter unit is on.
b. The LEDs on all the BladeCenter power modules are on.
c. If the blade server is in blade bay 7 through 14 (in a BladeCenter unit) or in
blade bay 5 through 8 (in a BladeCenter T unit), power modules must be
present in all four power-module bays.
d. The power-on LED on the blade server control panel is blinking slowly.
v
If the power LED is flashing rapidly and continues to do so, the blade
server is not communicating with the management module; reseat the
blade server and go to step 3
v
If the power LED is off, the blade bay is not receiving power, the blade
server is defective, or the LED information panel is loose or defective.
e. Local power control for the blade server is enabled (use the BladeCenter
management module Web interface to verify), or the blade server was
instructed through the management module (Web interface or IBM Director)
to start.
2. If you just installed a device in the blade server, remove it, and restart the
blade server. If the blade server now starts, you might have installed more
devices than the power to that blade bay supports.
3. Try another blade server in the blade bay; if it works, replace the faulty blade
server.
4. See “Solving undetermined problems” on page 50.
The blade server does not start
and the following conditions are
present:
v The amber system-error LED
on the BladeCenter unit
system LED panel is lit.
v The amber blade error LED
on the blade server control
panel is lit.
v The management-module
event log contains the
message
Processor speed
mismatch .
Make sure that microprocessors 1 and 2 are identical (number of cores, cache size
and type, clock speed, internal and external clock frequencies).
(Trained service technician only) If microprocessors are not identical, remove the
microprocessor with the incorrect specifications and replace with a microprocessor
that has the correct specifications.
The blade server turns off for no
apparent reason
1. Make sure that each blade bay has a blade server, expansion unit, or filler
blade correctly installed. If these components are missing or incorrectly
installed, an over-temperature condition might result in shutdown.
2. (Trained service technician only) If the microprocessor error LED is lit, replace
the microprocessor.
Chapter 2. Diagnostics
37