- Notes, cautions, and warnings
- Working on your computer
- Major components of your system
- Technology and components
- Disassembly and reassembly
- SD card
- SSD door
- Secondary M.2 solid-state drive
- Base cover
- Battery
- Solid State Drive
- Secondary memory module
- SIM card
- WLAN card
- WWAN card
- Keyboard lattice
- Keyboard
- Primary memory module
- Heat sink
- Power-adapter port
- Power button board
- Power button board with fingerprint reader
- Inner frame
- Smart-card reader
- Touchpad button
- SD card reader
- Power button
- Power button assembly with fingerprint reader
- GPU power cable
- System board
- GPU card
- Speaker
- Middle cap
- Display assembly
- Palm rest
- Display bezel
- Display panel
- Display hinges
- Camera
- P-sensor board
- Display cable
- Display back cover
- Troubleshooting
- Getting help
Precision 7750 Service Manual
Display panel power rail built-in self-test (L-BIST)
About this task
Next steps
L-BIST (LCD Power Rail Test) is an enhancement to the single LED error code diagnostics and is automatically initiated during POST. L-BIST isolates if the LCD is receiving power from the system board. L-BIST checks if the system board is supplying power to the LCD by performing an LCD Power Rail test. If there is no power going to the LCD, the battery status LED flashes a [2,8] LED error code.
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