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Design and Environmental Specifications
7.6
Post Code Diagnostic LEDs
POST code diagnostic LEDs are located on the back edge of the server board in the rear I/O
area of the server board between the PS/2 mouse / keyboard stacked connectors and the video
/ serial stacked 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 will display the given POST code to the POST code diagnostic
LEDs 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.
A. Status LED
B. ID LED
C. MSB LED (POST LED)
78
Intel® Server Boards S5000PSL and S5000XSL TPS
Figure 23. POST Code Diagnostic LED Location
Intel order number: D41763-003
D. Bit 2 LED (POST LED)
E. Bit 1 LED (POST LED)
F. LSB LED (POST LED)
Revision 1.2
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