IBM 86884RX Maintenance Manual - Page 190

Power, supply, errors

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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 LED to come on is: v Power supply v Top power board AC good LED Off On On On On DC good LED Off Off On On On Front Power good power on indicators light (midplane) Off Off Off Off Blinking Off On Off On On Description FRU/action No power to system or ac problem. 1. Check ac power to system. 2. Power supply. 3. Top power board. DC source power problem Unplug the three power connectors to the midplane board. If the DC Good LED does not come on: 1. Inspect and replace any damaged power cables. 2. Check ac power to system. 3. Power supply. 4. Top power board. Standby power problem 1. Disconnect the following items from the midplane board to isolate the failing FRU: a. Light Path cable and SCSI power cable b. Memory-board assembly c. Processor-board assembly d. PCI or PCI-X adapters e. PCI-X board f. Remote Supervisor Adapter (watch for lit or flashing LEDs on I/O board) g. I/O board cable attachments 2. If LEDs are on after removal, replace the offending device. 3. If no LEDs are lit after step 1, replace the following: a. I/O board b. Midplane board Failure to power up POWER GOOD problem 1. Check indicators for a failing VRM; replace any failing VRMs. 2. Remove the adapters and disconnect cables and power connectors to all internal and external devices. Turn on the server. 3. If the Power Good LED comes on, replace the adapters and devices one at a time until you isolate the problem. 4. Power supply. 5. Top power board. 6. Midplane board. Power is OK. N/A 180 IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide

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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
LED
to
come
on
is:
v
Power
supply
v
Top
power
board
AC
good
LED
DC
good
LED
Front
power
on
light
Power
good
indicators
(midplane)
Description
FRU/action
Off
Off
Off
Off
No
power
to
system
or
ac
problem.
1.
Check
ac
power
to
system.
2.
Power
supply.
3.
Top
power
board.
On
Off
Off
Off
DC
source
power
problem
Unplug
the
three
power
connectors
to
the
midplane
board.
If
the
DC
Good
LED
does
not
come
on:
1.
Inspect
and
replace
any
damaged
power
cables.
2.
Check
ac
power
to
system.
3.
Power
supply.
4.
Top
power
board.
On
On
Blinking
Off
Standby
power
problem
1.
Disconnect
the
following
items
from
the
midplane
board
to
isolate
the
failing
FRU:
a.
Light
Path
cable
and
SCSI
power
cable
b.
Memory-board
assembly
c.
Processor-board
assembly
d.
PCI
or
PCI-X
adapters
e.
PCI-X
board
f.
Remote
Supervisor
Adapter
(watch
for
lit
or
flashing
LEDs
on
I/O
board)
g.
I/O
board
cable
attachments
2.
If
LEDs
are
on
after
removal,
replace
the
offending
device.
3.
If
no
LEDs
are
lit
after
step
1,
replace
the
following:
a.
I/O
board
b.
Midplane
board
On
On
On
Off
Failure
to
power
up
POWER
GOOD
problem
1.
Check
indicators
for
a
failing
VRM;
replace
any
failing
VRMs.
2.
Remove
the
adapters
and
disconnect
cables
and
power
connectors
to
all
internal
and
external
devices.
Turn
on
the
server.
3.
If
the
Power
Good
LED
comes
on,
replace
the
adapters
and
devices
one
at
a
time
until
you
isolate
the
problem.
4.
Power
supply.
5.
Top
power
board.
6.
Midplane
board.
On
On
On
On
Power
is
OK.
N/A
180
IBM
xSeries
450
Type
8688:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide