Technical Product Specification

Intel® Server Board S5520UR and S5520URT TPS Intel® Light-Guided Diagnostics
Revision 1.9 Intel order number E44031-012
119
8. Intel
®
Light-Guided Diagnostics
The server board has several on-board diagnostic LEDs to assist in troubleshooting board-level
issues. This section shows where each LED is located on the server board and describes the
function of each LED.
8.1 5-Volt Standby LED
Several server management features of this server board require that a 5-V standby voltage be
supplied from the power supply. Some of the features and components that require this voltage
be present when the system is “Off” include the Integrated BMC, on-board NICs, and an
optional RMM3 connector when Intel
®
RMM3 is installed.
The LED is located in the lower-left corner of the server board and is labeled “5VSB_LED”. It is
illuminated when AC power is applied to the platform and 5 volt standby voltage is supplied to
the server board by the power supply.
Figure 41. 5-Volt Standby Status LED Location