Lenovo 5457 Installation And Service Manual page 129

IMM heartbeat LED
RTMM heartbeat LED
Power error LED
PCI slot 4 error LED
PCI slot 3 error LED
PCI slot 2 error LED
PCI slot 1 error LED
Battery error LED
Fan 2 connector
error LED
Figure 70. LED location on system board
The server is designed so that LEDs remain lit when the server is connected to an ac power source but is not
turned on, provided that the power supply is operating correctly. This feature helps you to isolate the
problem when the operating system is shut down.
Note: When you disconnect the power source from the server, you lose the ability to view the LEDs because
the LEDs are not lit when the power source is removed. Before you disconnect the power source, make a
note of which LEDs are lit, including the LEDs that are lit on the operation information panel and LEDs inside
the server on the system board.
Many errors are first indicated by a lit system-error LED on the control-panel assembly of the server. If this
LED is lit, one or more LEDs elsewhere in the server might also be lit and can direct you to the source of the
error.
Before you work inside the server to view the LEDs, read the
sensitive devices" on page
If an error occurs, view the server LEDs in the following order:
1. Check the control-panel assembly on the front of the server. If the system-error LED is lit, it indicates
that an error has occurred.
2. Check the front and rear of the server to determine whether any component LEDs are lit.
3. Remove the server top cover and look inside the server for lit LEDs. Certain components inside the
server have LEDs that will be lit to indicate the location of a problem. For example, a DIMM error will light
the LED next to the failing DIMM on the system board.
4. Look at the system service label inside the top cover of the server, which gives an overview of internal
components. This information can often provide enough information to correct the error.
The following table describes the LEDs on the system board and suggested actions to correct the detected
problems.
Microprocessor
error LED
33.
Fan 1 connector
error LED
Standby power LED
System board
error LED
DIMM 4-1error LEDs
"Safety" on page v and "Handling static-
.
Chapter 4 Troubleshooting
117