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Index of Symptom-to-FRU Error
Message
LCD-Related Symptoms
F4h 1 Output one beep before boot
F5h Boot to Mini DOS
F6h Clear Huge Segment
F7h Boot to Full DOS
Symptom / Error Action in Sequence
■
The LCD backlight doesn't work.
■
The LCD is too dark.
■
The LCD brightness cannot be
adjusted.
■
The LCD contrast cannot be adjusted.
■
Run BOIS Utility to execute “Load Setup Default Settings”,
then reboot the notebook.
■
Reconnect the LCD connectors.
■
Test or replace the keyboard (if contrast and brightness
function key doesn't work).
■
Check the LCD inverter ID.
■
Test or replace the LCD cable.
■
Test or replace the LCD inverter.
■
Test or replace the LCD.
■
Test or replace the system board.
■
The LCD screen is unreadable.
■
Missing pels in characters.
■
The screen appears abnormal.
■
The wrong color is displayed.
■
Reconnect the LCD connector.
■
Check the LCD inverter ID.
■
Test or replace the LCD cable.
■
Test or replace the LCD inverter.
■
Test or replace the LCD.
■
Test or replace the system board.
The LCD has extra horizontal or vertical
lines displayed.
■
Check the LCD inverter ID.
■
Test or replace the LCD inverter.
■
Test or replace the LCD cable.
■
Test or replace the LCD.
■
Test or replace the system board.
Code Beeps POST Routine Description