Technical Product Specification

Table Of Contents
Intel® Light-Guided Diagnostics Intel
®
Server Board S5400SF TPS
Revision 2.02
Intel order number: D92944-007
142
8.5 Fan Fault LEDs
There is a fan fault LED associated with each fan header. The Integrated 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, therefore once the lower critical threshold has been
crossed, the LED remains lit until the sensor is re-armed. These sensors are re-armed at
system DC power-on and system reset.
8.6 Post Code Diagnostic LEDs
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, BIOS displays the given POST code to the POST code diagnostic LEDs found
on the back edge of the server board. To assist in troubleshooting a system hang during the
POST process, the diagnostic LEDs can be used to identify the last POST process to be
executed. See Appendix C for a complete description of how these LEDs are read, and for a list
of all supported POST codes.
AF002177
Figure 50. POST Code Diagnostic LED Location