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Apple imac 20 inch early 2008 User Manual

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    							© 2008 Apple Inc. All rights reserved.
     Service Source
    iMac (20-inch Early 2008)
    20 June 2008 
    						
    							ii
     Apple Inc.
    © 2008 Apple Inc. All rights reserved.
    Under the copyright laws, this document may not be copied, in whole or in part, without the 
    written consent of Apple.
    Every effort has been made to ensure that the information in this document is accurate. Apple is 
    not responsible for printing or clerical errors.
    Apple 
    1 Infinite Loop 
    Cupertino, CA 95014-2084 
    USA 
    + 1 408 996 1010 
    www.apple.com
    Apple, the Apple logo, Mac, and Macintosh are trademarks of Apple Inc., registered in the U.S. and 
    other countries.  
    						
    							  iii
    iMac (20-inch Early 2008)
    Contents
    Manual Updates 7
    Updated 20 June 2008 7
    Product Introduction April 29, 2008 7
    Take Apart
    General Information  10
    Product Features 10
    Product Configurations  11
    Opening the Computer  11
    Note About Images in This Manual  11
    Serial Number Location  12
    General Tools  12
    Required Special Tools  12
    Cleaning Tools Starter Kit  13
    Removing the Glass Panel  13
    View Under the LCD Panel  14
    View of the Main Modules 14
    View of Inside the Rear Housing  15
    Back View 15
    I/O Ports 16
    Cleaning and Handling the Glass Panel  17
    Do’s and Don’ts 18
    Handling a Broken Glass Panel  18
    Safety 19
    EMI Shielding  20
    Access Door 22
    Memory 24
    Glass Panel  28
    Cleaning and Handling of the Glass Panel  29
    Isopropyl Alcohol (IPA) 30
    Removing the Glass Panel  32
    Replacing the Glass Panel 35
    Installing a Replacement Glass Panel  40
    Cleaning Tool Kit 43 
    						
    							iMac (20-inch Early 2008)  Take Apart iv
    Cleaning Tool Resources 43
    LENSPEN Screen Cleaning Device  44
    Front Bezel 46
    Camera Board  52
    Battery 56
    IR (Infrared) Board  59
    AirPort Extreme Card  62
    Bluetooth Board 65
    LCD Display Panel  68
    LCD Temp Sensor Cable  76
    LVDS Cable 82
    Inverter 87
    Speaker, Right  93
    Speaker, Left 96
    Ambient Temperature Sensor Cable  101
    Ambient Temperature Sensor 104
    Optical Drive Fan 108
    CPU Fan 113
    Power Supply, AC/DC  116
    Hard Drive 124
    Hard Drive Sensor Cable  130
    Optical Drive 133
    Optical Drive Flex Cable  138
    Optical Sensor Cable 141
    Logic Board 144
    Video Card 153
    Hard Drive Fan  158
    Audio Board 162 
    						
    							  v
    Camera Cable 165
    Microphone Cable  172
    Hard Drive Data Cable  179
    Mechanism Cover 182
    Clutch Mechanism  185
    Cable, DC, Power Supply/SATA/Inverter  189
    Rear Cover 206
    Stand 209
    Chassis  213
    Troubleshootin g
    General Information  224
    Serial Number 224
    Power On Self Test (POST )  225
    Firmware Updates 225
    DDR Memory 225
    How to Reset the System Management Controller (SMC)  226
    Diagnostic LEDs 227
    Apple Hardware Test (AHT ) Error Codes  228
    Logic Board Sensor and Fan Connector Locations, Top Side  230
    Logic Board Sensor Locations, Back Side 231
    Cleaning Tools for the LCD and Glass 231
    LensPen Cleaning Tool 232
    Ionizing Air Gun 233
    Symptom Charts   234
    How to Use the Symptom Charts  234
    Diagnostics 234
    Apple Hardware Test (AHT ) Error Codes  235
    Power Issues 237
    System Shuts Down  242
    Display 242
    Hard Drive  244
    Optical Drive   246
    Fan Sound 253
    AirPort 258
    Bluetooth (also see Wireless Issues
     topic) 25 9
    IR Remote  260
    IR Sensor/Receiver  261 
    						
    							iMac (20-inch Early 2008)  Take Apart vi
    Built-in iSight Camera 262
    Speakers 264
    Mouse 
    (also see Wireless Issues topic) 265
    Keyboard 
    (also see Wireless Issues topic) 266
    Wireless Issues 
    (also see Additional Wireless Topics) 268
    Additional Wireless Topics  272
    Error Beep(s) 274
    USB 275
    Views
    iMac (20-inch Early 2008)—Upper Exploded View  278
    iMac (20-inch Early 2008)—Lower Exploded View 279
    Screw Chart 280 
    						
    							iMac (20-inch Early 2008)  — Manual Updates 7
    Manual Updates
    Updated 20 June 2008
    Troubleshooting
    Symptom Charts:• 
    Added new troubleshooting symptom: Optical Drive-->
    •	 Optical drive won’t eject 
    media.  Verify that two or three black clips (on the bezel) are positioned on top of the 
    optical drive mechanism. Refer to the topic for images and more information.
    Added a new troubleshooting symptom: Error Beeps-->
    •	 iMac display is black and the 
    system beeps nine times (3 short, 3 long, 3 short), then repeats. Remove the small 
    coin battery located on the logic board near the right speaker. Wait 30 seconds, reinstall 
    the battery.
    Product Introduction April 29, 2008
    New images, screws, and updated text were added to the following sections:
    Take Apart
    Battery• 
    AirPort• 
    Bluetooth• 
    LCD Display• 
    LCD temp sensor cable• 
    LVDS display cable • 
    Right speaker• 
    Optical drive fan• 
    Optical flex cable• 
    DC, power supply/SATA/inverter cable• 
    Logic board• 
    Audio board• 
    Troubleshooting
    General Information: • 
    Apple Hardware Test (AHT ) error code tabl
    •	 e was added that lists the code and the 
    suspect part
    Logic Board Sensor and Fan Locators photo
    •	
    Diagnostic LEDs: new photo of LEDs
    •	
    Added Cleaning Tools for the LCD and Glass section
    •	
    Added LensPen Cleaning Tool information
    •	 
    						
    							iMac (20-inch Early 2008)  — Manual Updates 8
    Symptom Charts:• 
    Added new troubleshooting sections called 
    •	 Wireless Issues and Additional Wireless 
    Topics to help troubleshoot wireless keyboards and mice
    Added a new symptom: Power Issues-->
    •	 System that intermittently shuts down or 
    restarts unexpectedly
    Updated symptoms throughout for clarity, removed irrelevant links 
    •	
    Exploded View
    New part numbers were added to reference this iMac model•  
    						
    							© 2008 Apple Inc. All rights reserved.
     Service Source 
    Take Apart
    iMac (20-inch Early 2008) 
    						
    							iMac (20-inch Early 2008)  Take Apart — General Information 10
    General Information
    Product View
    Product Features
    The iMac (20-inch Early 2008) computer has the same overall look as the previous iMac. The big 
    differences are the upgraded processor (Intel Penryn chip) and the faster RAM speeds.
    New features:
    2.4 or 2.66 GHz Intel Core 2 Duo processors 
    • 
    1066 MHz front side bus• 
    2 GB and 4 GB memory options, PC2-6400 (800 MHz) DDR2, 4 GB max• 
    Mac OS X version 10.5.2 Leopard•  
    						
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