Light Path Diagnostics - Lenovo 5457 Installation And Service Manual

DSA Preboot diagnostic program is stored in the integrated USB memory on the server. DSA Preboot
collects and analyzes system information to aid in diagnosing server problems, as well as offering a rich
set of diagnostic tests of the major components of the server. DSA Preboot collects the following
information about the server:
– Drive health information
– Event logs for ServeRAID controllers and service processors
– Installed hardware, including PCI and USB information
– Light path diagnostics status
– Microprocessor, input/output hub, and UEFI error logs
– Network interfaces and settings
– RAID controller configuration
– Service processor (integrated management module) status and configuration
– System configuration
– Vital product data, firmware, and UEFI configuration
DSA Preboot also provides diagnostics for the following system components (when they are installed):
1. Emulex network adapter
2. IMM I2C bus
3. Light path diagnostics panel
4. Memory modules
5. Microprocessors
6. Optical devices (CD or DVD)
7. SAS or SATA drives
See "Running DSA Preboot diagnostic programs" on page 127
DSA Preboot program on the server.
• Troubleshooting by symptom
These tables list problem symptoms and actions to correct the problems. See
symptom" on page 129

Light path diagnostics

The Light path diagnostics is a system of LEDs that leads you to the failed component. When an error
occurs, LEDs are lit along the path of the light path diagnostics, 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
page v and "Handling static-sensitive devices" on page
If an error occurs, view the LEDs on the light path diagnostics on the front of the server.
• If the check log LED is lit, it indicates that an error or multiple errors have occurred. The sources of the
errors cannot be isolated or concluded by observing the light path diagnostics LEDs directly. A further
investigation into IMM event log or system-error log might be required.
The following illustration shows the light path diagnostics on the front of the server.
for more information.
for more information on running the
33.
"Troubleshooting by
"Safety" on
.
Chapter 4 Troubleshooting
115