Acer 4720 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 Default Settings”, then
LCD is too dark	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 inverter ID
	LCD cable
	LCD inverter
	LCD
	System board
Unreadable LCD screen	Reconnect the LCD connector
Missing pels in characters	LCD inverter ID
Abnormal screen	LCD cable
Wrong color displayed	LCD inverter
	LCD
	System board
LCD has extra horizontal or vertical lines	LCD inverter ID
displayed.	LCD inverter
	LCD cable
	LCD
	System 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
	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 69.
	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 69.
	Battery pack
	Power adapter
	Hard drive & battery connection board
	System board
The system doesn’t power-off.	Power source (battery pack and power adapter). See “Power
	System Check” on page 69.
	Hold and press the power switch for more than 4 seconds.
	System board

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