108 Chapter 4
Index of Symptom-to-FRU Error Message
LCD-Related Symptoms
Symptom / Error Check or do the following in sequence
LCD backlight doesn't work
LCD is too dark
LCD brightness cannot be adjusted
LCD contrast cannot be adjusted
T Run “Load Setup Defaults” in BIOS Setup Utility, then reboot
system.
T Reconnect the LCD connectors.
T Keyboard (if contrast and brightness function key doesn't
work).
T LCD inverter ID
T LCD cable
T LCD inverter board
T LCD
T Mainboard
Unreadable LCD screen
Missing pels in characters
Abnormal screen
Wrong color displayed
T Reconnect the LCD connector
T LCD inverter ID
T LCD cable
T LCD inverter board
T LCD
T Mainboard
LCD has extra horizontal or vertical lines
displayed.
T LCD inverter ID
T LCD inverter board
T LCD cable
T LCD
T Mainboard
Indicator-Related Symptoms
Symptom / Error Check or do the following in sequence
Indicator incorrectly remains off or on, but
system runs correctly
T Reconnect the inverter board.
T Mainboard
Power-Related Symptoms
Symptom / Error Check or do the following in sequence
Power shuts down during operation
T Power source (battery pack and power adapter). See “Power
System Check” on page 99.
T Battery pack
T Power adapter
T Hard disk drive & battery connection board
T Mainboard
The system doesn’t power-on.
T Power source (battery pack and power adapter). See “Power
System Check” on page 99.
T Battery pack
T Power adapter
T Hard disk drive & battery connection board
T Mainboard
SG_Aspire4920_Book.book Page 108 Monday, May 28, 2007 6:49 PM
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