Power-Supply Led Errors - IBM 8670M1X User Manual

Note: See "System" on page 116 to determine which components a field service technician should replace.
Universal Serial Bus (USB) port problems
Symptom
A USB device does not work.

Power-supply LED errors

Use the information in this section to solve power-supply problems.
Note: The minimum configuration required for the dc good light to be lit is:
v Power supply
v Power cage assembly.
v System board (set switch 3 of SW2 to bypass the power switch; see
Note: See "System" on page 116 to determine which components a field service technician should replace.
AC good LED DC good LED
Off Off
On Off
On On
FRU/action
Verify that:
v You are not trying to use a USB device during POST if you have a standard
(non-USB) keyboard attached to the keyboard port.
Note: If a standard (non-USB) keyboard is attached to the keyboard port, the
USB is disabled and no USB device will work during POST.
v The correct USB device driver is installed.
v The operating system supports USB devices.
"System-board switches and jumpers" on page 46).
Description
No power to system or ac
problem.
Standby mode or dc
problem.
Power is working properly.
FRU/action
1. Check ac power to the system.
2. Disconnect the ribbon cable from connector
J25 on the system board. If the ac power
LED comes on, see "Undetermined
problems" on page 112.
3. Power supply.
1. Check system board cable connectors
J4 and J10. Move switch 3 of SW 1 to
bypass power control. If the dc good LED
is lit, press Ctrl+Alt+Delete. Watch the
screen for any POST errors. Check the
system-error log for any listed problems. If
the system starts with no errors:
a. Power switch assembly
b. System board
2. Remove the adapters, and disconnect the
cables and power connectors to all internal
and external devices. Turn on the system.
If the dc good LED is lit, replace the
adapters and devices one at a time until
you isolate the problem.
3. Power supply.
4. Power cage assembly.
5. System board.
N/A
Chapter 6. Symptom-to-FRU index
101