Technical Product Specification

Intel® Server Board S1400FP TPS Intel® Light Guided Diagnostics
Revision 2.0 Intel order number G64246-003
101
10.4
Post Code Diagnostic LEDs
A bank of eight POST code diagnostic LEDs are located on the back edge of the server next to
the stacked USB connectors. During the system boot process, the BIOS executes a number of
platform configuration processes, each of which is assigned a specific hex POST code number.
As each configuration routine is started, the BIOS displays the given POST code to the POST
code diagnostic LEDs. The purpose of these LEDs is to assist in troubleshooting a system hang
condition during the POST process. The diagnostic LEDs can be used to identify the last POST
process to be executed. See Appendix C and D for a complete description of how these LEDs
are read, and for a list of all supported POST codes.
10.5
5 Volt Stand-By Present LED
This LED is illuminated when a power cord (AC or DC) is connected to the server and the power
supply is supplying 5 Volt Stand-by power to the server board. This LED is intended as a
service caution indicator to anyone accessing the inside of the server system.
10.6
Fan Fault LEDs
The server board includes a Fan Fault LED next to each of the system fans and CPU fan. The
LED has two states: On and Off. The BMC lights a fan fault LED if the associated fan-tach
sensor has a lower critical threshold event status asserted. Fan-tach sensors are manual re-arm
sensors. Once the lower critical threshold is crossed, the LED remains lit until the sensor is
rearmed. These sensors are rearmed at system DC power-on and system reset.
10.7
Memory Fault LEDs
The server board includes a Memory Fault LED for each DIMM slot. When the BIOS detects a
memory fault condition, it sends an IPMI OEM command (Set Fault Indication) to the BMC to
instruct the BMC to turn on the associated Memory Slot Fault LED. These LEDs are only active
when the system is in the ‘on’ state. The BMC will not activate or change the state of the LEDs
unless instructed by the BIOS.