Power Problems - IBM System x3350 Type 4192 Problem Determination And Service Manual

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 the parts listing in the Problem Determination and Service Guide on the IBM System x Documentation
CD 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 power-control button does
not work, and the reset button
does work (the server does not
start).
Note: The power-control button
will not function until 20
seconds after the server has
been connected to ac power.
142
IBM System x3350 Type 4192 and 4193: Problem Determination and Service Guide
Action
1. Make sure that the power-control button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the operator information panel
cable, and then repeat steps 1a and 1b.
d. (Trained service technician only) If the server starts, reseat the operator
information panel. If the problem remains, replace the operator information
panel.
2. Make sure that the reset button is working correctly:
a. Disconnect the server power cords.
b. Reconnect the power cords.
c. (Trained service technician only) Reseat the operator information panel
cable, and then repeat steps 2a and 2b.
v (Trained service technician only) If the server starts, replace the operator
information panel.
v If the server does not start, go to step 3.
3. Make sure that:
v The power cords are correctly connected to the server and to a working
electrical outlet.
v The type of memory that is installed is correct.
v The DIMMs are fully seated.
v The LEDs on the power supply do not indicate a problem.
v (Trained service technician only) The microprocessor is correctly installed.
4. If you just installed an optional device, remove it, and restart the server. If the
server now starts, you might have installed more devices than the power supply
supports.
5. Reseat the following components:
a. DIMMs
b. (Trained service technician only) Power backplane
6. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. DIMMs
b. Power supply
c. (Trained service technician only) Power backplane
d. (Trained service technician only) System board
7. See "Solving undetermined problems" on page 220.