Acer 420 Index of Symptom-to-FRU Error Message, LCD-Related Symptoms, Indicator-Related Symptoms

Index of Symptom-to-FRU Error Message

LCD-Related Symptoms

Symptom / Error	Action in Sequence
LCD backlight doesn't work	Enter BIOS Utility to execute “Load Setup Defaults” on Exit screen,
LCD is too dark	then reboot system.
LCD brightness cannot be adjusted	Reconnect the LCD connectors.
LCD contrast cannot be adjusted	Keyboard (if contrast and brightness function key doesn't work).
	LCD cable
	LCD inverter
	LCD
	Main board
Unreadable LCD screen	Reconnect the LCD connector
Missing pels in characters	LCD cable
Abnormal screen	LCD inverter
Wrong color displayed	LCD
	Main board
LCD has extra horizontal or vertical lines	LCD inverter
displayed.	LCD cable
	LCD
	Main board

Indicator-Related Symptoms

Symptom / Error	Action in Sequence
Indicator incorrectly remains off or on, but system	Reconnect the inverter board
runs correctly	Inverter board
	Main 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 79.
	Battery pack
	Power adapter
	Hard drive & battery connection board
	Main board
The system doesn’t power-on.	Power source (battery pack and power adapter). See “Power
	System Check” on page 79“.
	Battery pack
	Power adapter
	Hard drive & battery connection board
	Main board
The system doesn’t power-off.	Power source (battery pack and power adapter). See “Power
	System Check” on page 79.
	Hold and press the power switch for more than 4 seconds.
	Main board
Battery can’t be charged	See “Check the Power Adapter” on page 80.
	Battery pack
	Main board

86 Chapter 4