Acer Aspire 2920 Service Guide

Chapter 4111
Index of Symptom-to-FRU Error Message
LCD-Related Symptoms
Symptom / ErrorAction in Sequence
LCD backlight doesnt work
LCD is too dark
LCD brightness cannot be adjusted
LCD contrast cannot be adjustedEnter BIOS Utility to execute “Load Setup Default Settings”, 
then reboot system.
Reconnect the LCD connectors.
Keyboard (if contrast and brightness function key doesnt 
work).
LCD inverter ID
LCD cable
LCD inverter
LCD
System board
Unreadable LCD screen 
Missing pels in characters
Abnormal...

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The system doesn’t power-off. Power source (battery pack and power adapter). See “Power 
System Check” on page 99. 
Hold and press the power switch for more than 4 seconds.  
System board
Battery can’t be charged See “Check the Battery Pack” on page 101. 
Battery pack
System board
PCMCIA-Related Symptoms
Symptom / ErrorAction in Sequence
System cannot detect the PC Card 
(PCMCIA) PCMCIA slot assembly
System board
PCMCIA slot pin is damaged. PCMCIA slot assembly
Memory-Related Symptoms...

Chapter 411 3
The system doesnt resume from 
hibernation mode.See “Save to Disk (S4)” on page 37.
Hard disk connection board
Hard disk drive
System board
The system doesnt resume from standby 
mode after opening the LCD.See “Save to Disk (S4)” on page 37.
LCD cover switch
System board
Battery fuel gauge in Windows doesn’t go 
higher than 90%. Remove battery pack and let it cool for 2 hours.
Refresh battery (continue use battery until power off, then 
charge battery).
Battery pack
System board
System...

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NOTE: If you cannot find a symptom or an error in this list and the problem remains, see “Undetermined 
Problems” on page 116. Touchpad does not work. Reconnect touchpad cable.
Touchpad board
System board
Modem-Related Symptoms
Symptom / ErrorAction in Sequence
Internal modem does not work correctly. Modem phone port
modem combo board
System board Keyboard/Touchpad-Related Symptoms
Symptom / ErrorAction in Sequence 

Chapter 411 5
Intermittent Problems
Intermittent system hang problems can be caused by a variety of reasons that have nothing to do with a 
hardware defect, such as: cosmic radiation, electrostatic discharge, or software errors. FRU replacement 
should be considered only when a recurring problem exists.
When analyzing an intermittent problem, do the following:
1.Run the advanced diagnostic test for the system board in loop mode at least 10 times.
2.If no error is detected, do not replace any FRU.
3.If...

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Undetermined Problems
The diagnostic problems does not identify which adapter or device failed, which installed devices are incorrect, 
whether a short circuit is suspected, or whether the system is inoperative.  
Follow these procedures to isolate the failing FRU (do not isolate non-defective FRU).
NOTE: Verify that all attached devices are supported by the computer.
NOTE: Verify that the power supply being used at the time of the failure is operating correctly. (See “Power 
System Check”...

Chapter 511 7
Top View
Jumper and Connector Locations
Chapter 5 

11 8Chapter 5
Bottom View 

Chapter 511 9
Clearing Password Check and BIOS Recovery
This section provide you the standard operating procedures of clearing password and BIOS recovery for 
Aspire 2920/2920Z/2420. Aspire 2920/2920Z/2420 provide one Hardware Open Gap on main board for 
clearing password check, and one Hotkey for enabling BIOS Recovery.
Clearing Password Check
Hardware Open Gap Description
HW Gap position on M/B space:
Gap name in Aspire 2920/2920Z/2420 is G71
 
Steps for Clearing BIOS Password Check
If users set BIOS...

120Chapter 5
BIOS Recovery by Crisis Disk
BIOS Recovery Boot Block:
BIOS Recovery Boot Block is a special block of BIOS. It is used to boot up the system with minimum BIOS 
initialization. Users can enable this feature to restore the BIOS firmware to a successful one once the previous 
BIOS flashing process failed.
BIOS Recovery Hotkey:
The system provides a function hotkey: Fn+Esc, for enable BIOS Recovery process when system is powered 
on during BIOS POST. To use this function, it is strongly...