Chapter 4
119
Index of Symptom-to-FRU Error Message
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
Enter BIOS Utility to execute “Load Setup Default Settings”,
then reboot system.
Reconnect the LCD connectors.
Keyboard (if contrast and brightness function key doesn't
work).
LCD inverter ID
LCD cable
LCD inverter
LCD
System board
Unreadable LCD screen
Missing pels in characters
Abnormal screen
Wrong color displayed
Reconnect the LCD connector
LCD inverter ID
LCD cable
LCD inverter
LCD
System board
LCD has extra horizontal or vertical lines
displayed.
LCD inverter ID
LCD inverter
LCD cable
LCD
System board
Indicator-Related Symptoms
Symptom / Error
Action in Sequence
Indicator incorrectly remains off or on, but
system runs correctly
Reconnect the inverter board
Inverter board
System board
Power-Related Symptoms
Symptom / Error
Action in Sequence
Power shuts down during operation
Power source (battery pack and power adapter). See “Power
System Check” on page 107.
Battery pack
Power adapter
Hard drive & battery connection board
System board
The system doesn’t power-on.
Power source (battery pack and power adapter). See “Power
System Check” on page 107.
Battery pack
Power adapter
Hard drive & battery connection board
System board
SG_Tangiz.book Page 119 Tuesday, July 10, 2007 11:01 AM
Summary of Contents for 7720
Page 6: ...VI ...
Page 10: ...X Table of Contents ...
Page 50: ...40 Chapter 1 ...
Page 67: ...Chapter 2 57 ...
Page 68: ...58 Chapter 2 ...
Page 114: ...104 Chapter 3 ...
Page 128: ...118 Chapter 4 F5h Boot to Mini DOS F6h Clear Huge Segment F7h Boot to Full DOS Code Beeps ...
Page 172: ...Appendix A 162 ...
Page 178: ...168 Appendix C ...