Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 87

Index of Symptom-to-FRU Error Message NOTE: If the symptom or error for your problem condition is not listed in this section, refer to the "Undetermined Problems" section on page 81. LCD-related Symptoms Symptom/Error LCD backlight doesn't work LCD is too dark LCD brightness cannot be adjusted LCD contrast cannot be adjusted Unreadable LCD screen Missing pels in characters Abnormal screen Wrong color displayed LCD has extra horizontal or vertical lines displayed. Action in Sequence Run the Setup Utility, then press F9 to load the system defaults. Reconnect the LCD-CCD cable. Keyboard (if contrast and brightness function key doesn't work). LCD-CCD cable Inverter board LCD panel System board Reconnect the LCD-CCD cable. LCD cable Inverter board LCD panel System board Inverter board LCD-CCD cable LCD panel System board Power-related Symptoms Symptom/Error Power shuts down during operation The system won't power on. The system won't power off. Battery won't charged Action in Sequence Power source (battery pack and power adapter). Refer to the "Power System Check" section on page 67. Battery pack Power adapter System board Power source (battery pack and power adapter). Refer to the "Power System Check" section on page 67. Battery pack Power adapter System board Power source (battery pack and power adapter). Refer to the "Power System Check" section on page 67. Hold and press the power button for more than four seconds. System board Refer to the "Check the Battery Pack" section on page 67. Battery pack System board Chapter 4 77