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76 Chapter 4
Symptom-to-FRU Error Messages
LCD-Related Symptoms
Symptom / Error Action in Sequence
LCD backlight doesn't work
LCD is too dark
LCD brightness cannot be adjusted
LCD contrast cannot be adjusted
Run “Load Setup Defaults” using the BIOS Setup Utility,
then reboot the system.
Reconnect the LCD connector.
Test or replace the keyboard (if contrast and brightness
function key doesn’t work).
Test or replace the LCD cable.
Test or replace the LCD.
Test or replace the mainboard.
Unreadable LCD screen
Missing pels in characters
Abnormal screen
Wrong color displayed
Reconnect the LCD connector.
Test or replace the LCD cable.
Test or replace the LCD.
Test or replace the mainboard.
LCD has extra horizontal or vertical lines
displayed.
Test or replace the LCD cable.
Test or replace the LCD.
Test or replace the mainboard.
Power-Related Symptoms
Symptom / Error Action in Sequence
System shuts down during operation
Test the power source (battery pack and power adapter).
See “Power System Check” on page 67.
Test or replace the battery pack.
Test or replace the power adapter.
Test or replace the mainboard.
System doesn’t power-on.
Test the power source (battery pack and power adapter).
See “Power System Check” on page 67.
Test or replace the battery pack.
Test or replace the power adapter.
Test or replace the mainboard.
System doesn’t turn off.
Test the power source (battery pack and power adapter).
See “Power System Check” on page 67.
Press and hold the power button for more than 4 secs.
Test or replace the mainboard.
The battery can’t be charged
Test the battery pack. See “Check the Battery Pack” on
page 68.
Test or replace the battery pack.
Test or replace the mainboard.
Memory-Related Symptoms
Symptom / Error Action in Sequence
Memory count (size) appears different from
actual size.
Run “Load Setup Defaults” using the BIOS Setup Utility,
then reboot the system.
Test or replace the SO-DIMM.
Test or replace the mainboard.