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521
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Specifications
System Block Diagram
Bluetooth
Password
Euro symbol
Indicators
Wireless LAN
Warranty
Dimension
Common Problems
Page 2
Image 2
Revision History
Please refer to the table below for the updates made on this service guide.
Date
Chapter
Updates
II
Page 1
Page 3
Page 2
Image 2
Page 1
Page 3
Contents
Aspire one 521 Series Service Guide
Revision History
Copyright
Conventions
Preface
Page
Table of Contents
111
AO521
Table of Contents
Features
Chapter
Optical Media Drive
Storage subsystem
Audio subsystem
Communication
Accessories
Dimensions and Weight
Power Adapter and Battery
Special Keys and Controls
Warranty
Environment
System Block Diagram
AMD ASB2 CPU
Top View
Icon Description
Closed Front View
Left View
Right View
Icon Function Description
Indicators
Base View
TouchPad Basics
Function Left Button Right Button Main TouchPad
Lock Keys and embedded numeric keypad
Using the Keyboard
Desired access Num Lock on Num Lock off
Lock key Description
Windows Keys
Key Description
Hot Keys
Hotkey Icon Function Description
US dollar sign
Euro symbol
Special Keys
Processor Specifications
Hardware Specifications and Configurations
Processor Specification
North Bridge Chipset Specification
Setup of 2D polygons and lines
Item NB Specification
Item NB Specification
Normal operation
Item NB Specification
Southbridge Chipset Specification
Item SB Specification
System Memory Specification
USB
Hard Disk Drive Interface Specification
LCD Specification
Bluetooth Specification
Lvds
Keyboard Specification
Audio Codec and Amplifier Specification
LAN Interface Specification
Media Card Reader Specification
Wireless LAN Specification
Battery Specification Cell
Interface Specifications
Bios Setup Utility
Navigating the Bios Utility
Information
Parameter Description
Main
Parameter Description Format/Option
Security
Setting a Password
Disabled or
Parameter Description Option
Enter New Password
Removing a Password
Changing a Password
Continue
Boot
Information Main Security Boot Exit
Exit
Exit Exit Saving Changes
Bios Flash Utility
DOS Flash Utility
Page
WinFlash Utility
Select Enter Unlock Password and press Enter
Remove HDD/BIOS Password Utilities
Remove HDD Password
Removing Bios Passwords
Miscellaneous Utilities
Using Boot Sequence Selector
Using DMITools
Using the LAN MAC Utility
Example 1 Read DMI Information from Memory
Related Information
Disassembly Requirements
Replacement Requirements
Pre-disassembly Instructions
Disassembly Process
Main Screw List Quantity Acer Part Number
Screw List Step Quantity
External Module Disassembly Process
External Modules Disassembly Flowchart
Removing the Battery Pack
Removing the Dummy Card
Removing the Base Door
Step Screw Quantity Screw Type
Removing the Dimm Module
Removing the Hard Disk Drive Module
Chapter
Step Screw Quantity Screw Type
Removing the Wlan Module
Pull the Wlan module out and away Chapter
Step Screw Quantity Screw Type 3G Module Disassembly
Removing the 3G Module
Pull the 3Gmodule out and away Chapter
Main Unit Disassembly Process
Main Unit Disassembly Flowchart
Step Screw Quantity
Removing the Keyboard
Page
Removing the Upper Cover
Remove the seventeen 17 screws in the upper cover
Chapter
Removing the Touchpad Board
Removing the Bluetooth Module
Removing the LCD Module
Remove two 2 screws from the hinge
Removing the Mainboard
Chapter
Removing the Thermal Module
Lift the thermal module away from the main board
Step Screw Quantity Screw Type Speaker Disassembly
Removing the Speakers
Lift the speakers clear of the lower cover
LCD Module Disassembly Process
LCD Module Disassembly Flowchart
Removing the LCD Bezel
Step Screw Quantity Screw Type Remove LCD Bezel M2.5*4
Page
Removing the Camera Board
Removing the LCD Panel
Step Screw Quantity Screw Type Remove LCD Panel M2x3
Chapter
Removing the LCD Cover Hinges
LCD Reassembly Procedure
Replacing the LCD Cover Hinges
Replacing the LCD FPC Cable
Step Screw Quantity Screw Type LCD Panel Assembly
Replacing the LCD Panel
Replacing the Camera Board
Replacing the LCD Bezel
Step Screw Quantity Screw Type Replace LCD Bezel M2.5*4
Main Unit Reassembly Process
Replacing the Speakers
Page
Replacing the Thermal Module
Replacing the Mainboard
Replacing the LCD Module
M2.5x5
Place the Lvds cable in the hinge channel as shown Chapter
Replacing the Bluetooth Module
Replacing the Touchpad Board
Replacing the Upper Cover
Step Size Quantity Screw Type
100 Chapter
Replacing the Keyboard
Replacing the Hard Disk Drive
Page
Replacing the Dimm Module
Replacing the 3G Module
Replacing the Wireless LAN Module
Connect the two 2 Wlan antennas Chapter 107
Replacing the Base Door
Replace the Dummy Card
Replacing the Battery
110 Chapter
Common Problems
Symptoms Verified Go To
Power On Issue
Computer Shuts down Intermittently
No Display Issue
No Post or Video
Random Loss of Bios Settings
Abnormal Video Display
LCD Failure
Built-In Keyboard Failure
TouchPad Failure
Sound Problems
Internal Speaker Failure
Internal Microphone Failure
Microphone Problems
Select Set up microphone
Select Repair your computer
HDD Not Operating Correctly
Other Failures
Select Startup Repair
Intermittent Problems
Undetermined Problems
Code Beeps Post Routine Description
Post Code Reference Tables
Post Code Range Post Routine Description
Code Beeps Post Routine Description
124 Chapter
Code Beeps For Boot Block in Flash ROM
126 Chapter
Jumper and Connector Locations
Mainboard Top View
Mainboard Bottom View
Bios Recovery Boot Block
Bios Recovery
Bios Recovery by Crisis Disk
Bios Recovery Hotkey
130 Chapter
Exploded Diagrams
FRU Field Replaceable Unit List
Main Assembly
Description Part Number
Chapter 133
LCD Assembly
FRU List
Category Description Adapter
Category Description
Category Description LCD Module
Screw List
Mainboard
Model Definition and Configuration
Appendix a
AO521
Model Acer Part No Country Description
TWN Gctwn
AO521 LU.SBS0D.056
AO521 LU.SBS0D.041
AO521 LU.SBS0D.024
AO521 LU.SBS0D.007
Model Acer Part No
Memory Chip
AO521 LU.SBT0D.007
105Hk 05B
AO521 LU.SBS0D.030
AAK32
1GB 2GB
Model Acer Part No Memory
Media Processor
152
N250G 105Dk B5.4KS AO521
154
HDD ODD
Media Processor 1GB 2GB
AO521-12BHk
158
Appendix B
Keyboard
Modem
Type Description NB Chipset
WiFi Antenna
Wireless LAN
SB Chipset
162
Online Support Information
Appendix C
164
Index
Block Diagram
167
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