Light Path Diagnostics - Lenovo HX1310 Installation And Service Manual

9. Intel GPU
10. Nvidia GPU
See "Running the DSA Preboot diagnostic programs" on page 61 for more information on running the
DSA Preboot program on the server.
• Troubleshooting by symptom
These tables list problem symptoms and actions to correct the problems. See "Troubleshooting by
symptom" on page 63 for more information.

Light path diagnostics

Light path diagnostics is a system of LEDs on various external and internal components of the server that
leads you to the failed component. When an error occurs, LEDs are lit on the operator information panel
on the front of the server, then on the failed component. By viewing the LEDs in a particular order, you
can often identify the source of the error.
When LEDs are lit to indicate an error, they remain lit when the server is turned off, provided that the server is
still connected to power and the power supply is operating correctly.
Before you work inside the server to view light path diagnostics LEDs, read the safety information "Safety"
on page v and "Handling static-sensitive devices" on page 102.
If an error occurs, proceed as follows:
1. Look at the operator information panel (see "Operator information panel" on page 15) on the front of
the server.
• If the check log LED is lit, it indicates that information about an un-isolated fault condition in the
server is available in the IMM event log or in the system-event log.
• If the system-error LED is lit, it indicates that an error has occurred.
2. Remove the server cover and look inside the server for lit LEDs. Certain components inside the server
have LEDs that are lit to indicate the location of a problem. The system service label inside the server
cover provides an overview of internal components that correspond to errors indicated by the operator
information panel or LCD operating panel assembly (see "Operator information panel" on page 15 or
"LCD operating panel assembly" on page 15. This information can often provide enough information
to diagnose the error.
Note: You do not have to remove the server cover to view the LEDs on hard disk drives and power
supplies.
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Chapter 3 Troubleshooting
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