- Notes, cautions, and warnings
- Working on your computer
- Technology and components
- Disassembly and reassembly
- Subscriber Identity Module(SIM) board
- SD card—optional
- Base cover
- Battery
- SSD card–optional
- SSD frame
- Hard drive
- Coin-cell battery
- WLAN card
- WWAN card – optional
- Memory modules
- Keyboard lattice and Keyboard
- Heat sink
- System fan
- Power connector port
- Chassis frame
- LED board
- SmartCard module
- Touchpad panel
- System board
- Speaker
- Display hinge cover
- Display assembly
- Display bezel
- Display panel
- Display (eDP) cable
- Camera
- Display hinges
- Display back cover assembly
- Palm rest
- Troubleshooting
- Getting help
Latitude 5491 Service Manual
Enhanced Pre-Boot System Assessment — ePSA diagnostics
The ePSA diagnostics
(also known as system diagnostics) performs a complete check of your
hardware. The ePSA is embedded with the BIOS and is launched by the
BIOS internally. The embedded system diagnostics provides a set of
options for particular devices or device groups allowing you to:
- Run tests automatically or in an interactive mode
- Repeat tests
- Display or save test results
- Run thorough tests to introduce additional test options to provide extra information about the failed device(s)
- View status messages that inform you if tests are completed successfully
- View error messages that inform you of problems encountered during testing
CAUTION: Use the system diagnostics to test only your computer. Using this
program with other computers may cause invalid results or error messages.
NOTE: Some tests for
specific devices require user interaction. Always ensure that you
are present at the computer terminal when the diagnostic tests are
performed.
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