IBM xSeries 440 8687, Hardware Maintenance Manual

Page: 192 / 258

Power supply LED errors
Use the power supply LED information on the following page to troubleshoot power
supply problems.
Note: The minimum configuration required for the DC Good light to come on is:
v
Power supply
v
Top power board
v
AC power box
v
Centerplane
v
I/O board
v Power reset switch
v Power cord and cables
AC
good
LED
DC
good
LED
Front
power on
light
Power good
indicators
(center plane) Description FRU/action
Off Off Off Off No power to system
or ac problem.
1. Check ac power to system.
2. Isolate by removing one power supply at a
time.
3. Unplug the three power connectors to
center plane (J11, J19, J23).
a. Inspect cables.
b. Top power board.
On Off Off Off DC source power
problem
1. View service processor error logs
through serial connection of remote
supervisor adapter.
2. Isolate with single SMP Expansion Module.
3. Unplug the three power connectors to the
center plane (J11, J19, J23):
a. If dc LED lights, go to step 4.
b. If dc LED does not light:
1) Power supply.
2) Top power board.
4. Reconnect the three power connectors to
the center plane; then, isolate the failing
FRU by disconnecting:
v Center plane light path cable and SCSI
power cable (J8, J9)
v PCI adapters
v Fans 1 and 2
v I/O board cable attachments (J1, J2, J3,
J8) (see “I/O board internal connectors”
on page 132)
5. If no LEDs are lit after step 4, replace the
following:
a. Center plane VRM
b. Center plane
c. PCI-X board and VRM
d. I/O board and VRM
e. Remote Supervisor Adapter
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xSeries 440 Type 8687: Hardware Maintenance Manual