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Apple imac 20 inch early 2009 User Manual

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    							 Apple Technician Guide
    iMac (20-inch, Early/Mid 2009)
    iMac (20-inch, Early 2009), iMac (20-inch, Mid 2009)
    Updated:  2010-11-24  
    						
    							 Apple Inc.
    © 2009-2010 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.   
    						
    							iMac (20-inch, Early/Mid 2009)
    About This Guide
    Updates 8
    Updated 24 November 2010  8
    Updated 1 May 2009  8
    Updated 28 April 2009  8
    Introduced 3 March 2009  9
    Feedback 9
    Basics
    Overview 11
    Product Features  11
    Differences Between Models  11
    Product Configuration  12
    Serial Number Location  12
    Troubleshooting
    General Troubleshooting  14
    Update System Software & Firmware  14
    Troubleshooting Theory  14
    Hardware vs. Software  14
    Apple Hardware Test  14
    Apple Service Diagnostic  15
    Common Reset Procedures  15
    Power On Self Test (POST ) 15
    Starting Up in Safe Mode  15
    Resetting Parameter RAM (PRAM)  16
    Resetting the System Management Controller (SMC)  16
    Diagnostic LEDs 17
    Sensor and Fan Connector Locations  18
    Block Diagram  19
    Symptom Charts  20
    Startup and Power  20
    No Power, Dead Unit  20
    Won’t Start Up  22
    Intermittent Shutdown  24
    Kernel Panic, System Crashes  26
    No Video  28
    Corrupted Video  29
    Burnt Smell/Odor  31
    Uncategorized Symptoms  32 
    						
    							Display 33
    Backlight Issue/No Backlight  33
    Incorrect/Missing Colors  38
    Distorted/Blurred Image  39
    Pixel Anomalies  41
    Vertical/Horizontal Lines  42
    Non-Uniform Brightness  44
    Cosmetic Defects  45
    Uncategorized Symptoms  45
    Mass Storage 46
    Hard Drive Not Recognized  46
    Hard Drive Read/Write Error  48
    Hard Drive Noisy  49
    Optical Drive Not Recognized  51
    Optical Drive Won’t Accept/Eject Media  52
    Optical Drive Read/Write Error  54
    Optical Drive Not Performing to Specifications  55
    Optical Drive Noisy  56
    Uncategorized Symptoms  57
    Communications 58
    AirPort/Bluetooth Issues  58
    AirPort Card Kernel Panic  60
    Ethernet Port/Device Issue  61
    Wireless Input Device Doesn’t Pair  62
    Wireless Input Device Loses Connection  64
    Uncategorized Symptoms  66
    Input/Output Devices 67
    Apple Remote Inoperable  67
    Audio: Microphone  68
    Audio: Built-in Speakers Have Distorted Sound  70
    Audio: Built-in Speakers Have No Audio  71
    Camera Issues  73
    FireWire Devices Not Recognized  74
    USB Devices Not Recognized  76
    Wired Keyboard Does Not Function Properly  78
    Keyboard: Specific Keys Do Not Respond  80
    Wired Keyboard/Mouse Not Recognized  80
    Uncategorized Symptoms  82
    Mechanical 83
    Noise/Hum/Vibration  83
    Fan Failures / Thermal Issues  86
    Stand/Hinge Issues  87
    Physical Damage  87
    Uncategorized Symptoms  88 
    						
    							Take Apart
    General Information 90
    Opening the Unit 90
    Required Tools  90
    Required Special Tools for Glass Panel  91
    Cleaning Tools Starter Kit  91
    Cleaning & Handling the Glass Panel  92
    Do’s and Don’ts  92
    Handling a Broken Glass Panel  92
    How to Remove a Broken Glass Panel  93
    Safety 97
    Logic Board Handling  98
    Reassembly Steps  99
    Images in This Guide  99
    Screw Sizes  99
    Access Door  100
    Memory  101
    Glass Panel  103
    Removal 104
    Reassembly  105
    Front Bezel  109
    Camera  112
    Battery  114
    IR (Infrared) Board    116
    AirPort Extreme Card  118
    Bluetooth Board    120
    LCD Panel  122
    LVDS Cable  126
    Hard Drive  128
    Hard Drive Sensor Cable  132
    Optical Drive  134
    Optical Drive Sensor Cable  137
    Optical Drive Fan  139
    Optical Drive Data Cable  141
    Inverter  143
    Power Supply  145 
    						
    							Left Speaker 148
    Ambient Temp Sensor Cable  150
    CPU Fan  152
    Right Speaker  154
    Audio Board  156
    Logic Board  159
    Removal 160
    Reassembly  161
    Handling Logic Boards  163
    Hard Drive Fan 164
    Hard Drive Data Cable  166
    Mechanism Cover  167
    Stand  168
    Mechanism  170
    Chassis  172
    Cable, DC, Power Supply/SATA/Inverter  175
    Removal 176
    Reassembly  178
    Camera Cable  181
    Microphone Cable  183
    Rear Housing  185
    Views
    Exploded Views  187
    iMac (20-inch, Early 2009), Part 1  187
    iMac (20-inch, Early 2009), Part 2  188
    iMac (20-inch, Mid 2009), Part 1  189
    iMac (20-inch, Mid 2009), Part 2  190
    Screw Chart 191
    Internal Views  193
    I/O Ports  195 
    						
    							© 2009-2010 Apple Inc. All rights reserved.
     Apple Technician Guide 
    About This Guide
    iMac (20-inch, Early/Mid 2009)   
    						
    							iMac (20-inch, Early/Mid 2009) — Updates 8 2010-11-24
    Updates
    Updated 24 November 2010
    Troubleshooting:
    • General: Updated information and links for Updating System Software & Firmware, 
    Troubleshooting Theory, and Common Reset Procedures.
    •  Startup and Power: No Power, Dead Unit: Step 6: Yes: Changed action to “Go to step 7.”
    •  Startup and Power: Intermittent Shutdown: Step 1: Updated information about which 
    console log to check for OS 10.6 vs. OS 10.5 and earlier.
    Take Apart:
    •  General:
    •  Updated “Required Tools” and removed commercial screen cleaning products;
    •  Rewrote “Handling a Broken Glass Panel”;
    •  Consolidated information about ESD Safety.
    •  Access Door: Modified “First Steps”.
    •  Glass Panel: Modified “First Steps” and cleaning procedures; microfiber cloth should only 
    be dampened with water (rather than isopropyl alcohol or commerical screen cleaning 
    products).
    •  Camera: Changed tool needed from T8 to T10 screwdriver.
    •  Logic Board and Audio Board: Added note “If replacing logic board, be sure to leave audio 
    board attached and return it with the old logic board.”
    Views:
    •  Exploded Views: 
    •  Removed iMac (20-inch, Early 2009) logic board part #661-4984, which is now 
    substituted with part #661-5136.
    •  Added iMac (20-inch, Mid 2009) 2.26 GHz logic board part #661-5514.
    Updated 1 May 2009
    Views:
    • Exploded Views: Corrected rear housing information for Mid 2009 model.
    Updated 28 April 2009
    Basics:
    • Added section about differences between Early 2009 and Mid 2009 models.
    Troubleshooting:
    •  General Troubleshooting: Added sections about Apple Hardware Test and Apple Service 
    Diagnostic, how to determine which version to use.  
    						
    							iMac (20-inch, Early/Mid 2009) — Feedback 9 2010-11-24
    • Block Diagram: Added note that Mid 2009 model does not have IR or Bluetooth.
    Take Apart:
    •  Front Bezel: Added reassembly note to install bottom of bezel first.
    •  Camera Board: Corrected screw size and part number.
    •  IR Board: Added note that Mid 2009 model does not have an IR Board.
    •  Bluetooth Board: Added note that Mid 2009 model does not have a Bluetooth Board.
    •  Optical Drive: Added reassembly note to avoid trapped inverter cables.
    •  Hard Drive Sensor Cable, Optical Drive Sensor Cable, Hard Drive Fan: Added details about 
    connector pin sizes.
    •  Logic Board: Added note that Mid 2009 model does not have IR or Bluetooth boards.  Added 
    note to route camera cable over, not under, the logic board.  Removed note to transfer black 
    plastic airdam from old board to new board, as it should be included with new board.
    Views:
    •  Exploded Views: Added 1 logic board part number for Early 2009 model.  Added new 
    exploded views for Mid 2009 model.
    •  Screw Chart: Corrected camera screw size and part number.
    Introduced 3 March 2009
    Feedback
    We want your feedback to help improve this and future Technician Guides!   
    Please email any comments to:  [email protected]  
    						
    							© 2009-2010 Apple Inc. All rights reserved.
     Apple Technician Guide 
    Basics
    iMac (20-inch, Early/Mid 2009)   
    						
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