Acer Aspire 4920 4920G User Manual

							Chapter 4111
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 mainboard in loop mode at least 10 times.
2.If no error is detected, do not replace any FRU.
3.If any error is detected, replace the FRU. Rerun the test to verify that there are no more errors. 
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							11 2Chapter 4
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.  
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” on page 99.)
Follow procedures below to isolate the failing FRU. Do not isolate non-defective FRU.
1.Power off the computer.
2.Visually check them for damage. If any problems are found, replace the FRU.
3.Remove or disconnect all of the following devices:
TNon-Acer devices
TPrinter, mouse, and other external devices
TBattery pack
THard disk drive
TDIMM 
TCD/DVD-ROM drive 
TPC cards
4.Power on the computer.
5.Determine if the problem has been resolved.
6.If the problem does not recur, reconnect the removed devices one at a time until you find the failed FRU.
7.If the problem persists, replace the following FRU one at a time. Do not replace a non-defective FRU.
TSystem board
TLCD assembly
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							Chapter 511 3
System Block Diagram
System Block Diagram and Connector Locations
Chapter 5
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							11 4Chapter 5
Board Layout
Top View
#Item#Item
1 LCD connector 7 Power board cable connector
2 Internal microphone cable connector 8 USB board cable connector
3 Speaker cable connector 9 ExpressCard/54 slot
4 Keyboard cable connector 10 ICH8-M chipset (south bridge)
5 Touchpad cable connector 11 Launch board cable connector
6 Media board cable connector
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							Chapter 511 5
Bottom View
#Item#Item
1 AC-in jack 11 5-in-1 card reader
2 Mini-card connector 12 RTC battery cable connector
3 Battery cable connector 13 Modem board
4 CPU 14 Volume control wheel
5 Intel PM965 Express chipset (north bridge) 15 Line-in jack
6 CRT port 16 Microphone jack
7 RJ11+RJ45 port 17 Line-out jack
8 S-video port 18 ODD connector
9 USB ports 19 HDD connector
10 1394 port 20 DIMM slot
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							11 6Chapter 5
Switch Setting
Short R525 to clear password.
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							Chapter 511 7
Standard Operation Procedures of Password Bypassing and BIOS Recovery
For RD and CSD to debug easily, the system provide one hardware DIP switch for Bypassing Password 
Check, and one Hotkey to enable BIOS Recovery.
1.DIP Switches: 
2.Hotkey to enable BIOS Recovery: press the combination  Fn+ESC, then press the Power Button. To use 
this function, it is strongly recommended that the AC adapter is connected to the system and plug-in to a 
wall outlet and the Battery is also in the system
Bypassing Password Check (SW1): If the user has set Password (power-on or setup password) for security 
reason, BIOS will check password during POST or when entering the BIOS setup menu. However, if it is 
necessary to ignore the password check, the user may enable DIP SW1 to bypass password check.
BIOS Recovery: Boot Block is a special block of BIOS. It is used to boot up the system with minimum BIOS 
initialization. The user can enable this feature to restore the BIOS to a successful one if previous BIOS flashing 
process fails.
1.DIP Switch Location:
RD/CSD can enable or disable this function by switching the DIP. The DIP switch is located as shown in the 
figure below:
2.Clear Password
DIP SW1: Bypassing Password Check is disabled by default. Switching it to ON then powering on the system 
will force the BIOS to clear Supervisor and User passwords. The power-on, setup password, and the HDD 
password are all cleared.
DIPDefault SettingDescription
SW1 Disabled (High) Bypassing Password Check
R525
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							11 8Chapter 5
3.Restore BIOS by the Crisis Disk
Enable this function by pressing the combination: Fn+ESC, and pressing the Power Button. To use this 
function, it is strongly recommended that the AC adapter is connected to the system and plug-in to a wall outlet 
and the Battery is also in the system. If this function is enabled, the system will force the BIOS to enter a 
special BIOS block, called BootBlock. RD/CSD can use this special BIOS code to recover the BIOS to a 
successful one if previous BIOS flashing process fails. However, before doing this, one Crisis Disk should be 
prepared in WinXP. Detailed steps are as the followings:
a.Prepare the Crisis Disk in WinXP.
b.Insert the Crisis Disk to a USB floppy drive which is attached to the failed machine.
c.While the system is turned off, press and hold Fn+ESC, then press Power Button. The system 
should be powered on with Crisis Recovery process.
d.BootBlock BIOS starts to restore the failed BIOS code. Short beeps should be heard when flashing.
e.If the flashing process is finished, a long beep should be heard.
f.Power down the system after you hear the long beep.
If the crisis recovery process is finished, the system should be powered on with the successful BIOS. RD/CSD 
can then update the BIOS to a workable one by regular BIOS flashing process.
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							Chapter 611 9
This chapter offers the FRU (Field Replaceable Unit) list in global configuration of Aspire 4920. Refer to this 
chapter whenever ordering the parts to repair or for RMA (Return Merchandise Authorization).
NOTE: When ordering FRU parts, check the most up-to-date information available on your regional web or 
channel. For whatever reasons a part number is changed, it will NOT be noted on the printed Service 
Guide.  For Acer authorized service providers, your Acer office may have a different part number code 
from those given in the FRU list of this printed Service Guide. You MUST use the local FRU list provided 
by your regional Acer office to order FRU parts for service.
NOTE: To scrap or to return the defective parts, follow the local government ordinance or regulations on how 
to dispose it properly, or follow the rules set by your regional Acer office on how to return it.
FRU (Field Replaceable Unit) List
Chapter 6
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							120Chapter 4
Aspire 4920 Exploded Diagram
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