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:

vPower supply

vTop power board

AC

DC

Front

Power good

 

 

 

 

good

good

power on

indicators

 

 

 

 

LED

LED

light

(midplane)

Description

FRU/action

 

 

 

 

 

 

 

 

Off

Off

Off

Off

No power to system

1.

Check ac power to system.

 

 

 

 

or ac problem.

 

 

 

 

2.

Power supply.

 

 

 

 

 

 

 

 

 

 

3.

Top power board.

 

 

 

 

 

 

On

Off

Off

Off

DC source power

Unplug the three power connectors to the

 

 

 

 

problem

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

1.

Disconnect the following items from the

 

 

 

 

problem

 

 

 

 

 

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

1.

Check indicators for a failing VRM; replace

 

 

 

 

POWER GOOD

 

 

 

 

 

any failing VRMs.

 

 

 

 

problem

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

180IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide

Page 190
Image 190
IBM 8688 manual Power supply LED errors, Front Power good Good Power on Indicators, Light Midplane Description FRU/action