Acer Aspire 4920 Service Guide

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...

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...

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...

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...

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...

120Chapter 4
Aspire 4920 Exploded Diagram
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