System-Board Layout; System-Board Connectors - Lenovo ThinkSystem SN850 Setup Manual

Table 7. LEDs on the light path diagnostics panel
Lit light path diagnostics LED
None
Light path
System board
NMI
CPU mismatch
Temp
Memory
Storage BP 1 and 2
M.2

System-board layout

Use this information to locate the connectors, LEDs, and switches on the system board.

System-board connectors

Use this information to locate compute node system-board components and connectors for optional
devices.
The following illustration shows the system-board components, including connectors for user-installable
optional devices, in the compute node.
Description
The compute node is not sufficiently charged to display the LEDs on the system
board.
The power source for the light path diagnostics LEDs is charged.
The system board has failed.
A nonmaskable interrupt has occurred, or the NMI button was pressed.
The processors are mismatched.
The system temperature has exceeded a threshold level.
A memory error has occurred.
A drive backplane or its drives error has occurred.
A M.2 drive error has occurred.
.
Chapter 2 Compute node components
19