Apple iMac 24 Inch early 2008 Repair Manual [Improved]

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 (24-inch Early 2008) Contents Manual Updates 7 Updated 20 June 2008 7 Product Introduced April 29, 2008 7 Take Apart General Information 10 What’s New 10 Product Conﬁgurations 1 1 Opening the Computer 11 Note About Images in This Manual 11 General Tools 12 Required Special Tools 12 View of the iMac with the Front Bezel Removed 14 View of the Modules with the Display Panel Removed 14 View of the Rear Housing and Cables 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 21 Memory 23 Glass Panel 26 Cleaning and Handling the Glass Panel 27 Isopropyl Alcohol (IPA) 28 Cleaning the Silicone Roller 28 Do’s and Don’ts 28 Metal Alignment Pins on the Glass Panel 29 Magnets on the Front Bezel 29 Removing the Glass Panel 30 Replacing the Glass Panel 33 Installing a Replacement Glass Panel 38

iv Cleaning Tool Kit 41 Cleaning Tool Resources 41 LENSPEN Screen Cleaning Device 42 Ionizing Air Gun 43 Front Bezel 44 Camera Board 50 Battery 53 IR (Infrared) Board 56 AirPort Extreme Board 59 Bluetooth Board 63 LCD Display Panel 66 LCD Temp Sensor Cable 73 Left Speaker 79 Ambient Temp Sensor 83 Ambient Temp Sensor Cable 87 LVDS Display Cable 91 Right Speaker 97 Inverter Cable 100 Optical Drive Fan 104 CPU Fan 107 Power Supply, AC/DC 110 Hard Drive 117 Hard Drive Sensor Cable 124 Optical Drive 127 Optical Flex Cable 133 Optical Sensor Cable 136 Logic Board 140 Video Card 149

v Hard Drive Fan 154 Audio Board 157 Hard Drive Data Cable 160 Clutch Cover 163 Stand 166 Clutch Mechanism 171 Chassis 175 Camera Cable 180 Microphone Cable 185 Cable, DC, Power Supply/SATA 190 Rear Cover 195 Troubleshooting General Information 199 Serial Number 199 Power On Self Test (POST) 200 Firmware Updates 200 Diagnostic LEDs 202 Apple Hardware Test (AHT) Error Codes 204 Logic Board Sensor and Fan Connector Locations, Top Side 206 Logic Board Sensor Locations, Back Side 207 Cleaning Tools for the LCD and Glass 207 LensPen Cleaning Tool 207 Symptom Charts 208 How to Use the Symptom Charts 208 Diagnostics 208 Apple Hardware Test (AHT) Error Codes 209 Power Issues 211 Glass Panel 214 System Shuts Down 215 Display 216 Hard Drive 217 Optical Drive 219 Fan Sound 226 AirPort 231 Bluetooth (also see Wireless Issues topic) 232

vi IR Remote 233 IR Sensor/Receiver 234 Built-in iSight Camera 235 Speakers 237 Mouse (also see Wireless Issues topic) 238 Keyboard (also see Wireless Issues topic) 239 Wireless Issues (also see Additional Wireless Topics) 241 Additional Wireless Topics 245 Error Beep(s) 246 USB 247 Views iMac (24-inch Early 2008)—Upper Exploded View 249 iMac (24-inch Early 2008)—Lower Exploded View 250 Screw Chart 251

iMac (24-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 Introduced April 29, 2008 New images, screws, and updated text were added to the following sections: Take Apart Battery • AirPort • Bluetooth • LCD Display • LVDS display cable • Right speaker • Optical drive • Optical drive sensor board • Optical ﬂex 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 photo showing sensor and fan locations • front and back Diagnostic LEDs: new photo of LEDs • Added Cleaning Tools for the LCD and Glass section • Added LensPen Cleaning Tool information •

iMac (24-inch Early 2008) — Manual Update 8 Symptom Charts: • Updated symptoms throughout for clarity and removed irrelevant links • Added new troubleshooting sections called • Wireless Issues and Additional Wireless Topics to help troubleshoot wireless keyboards and mice Added new symptoms: • Some keys not working on the wireless keyboard and Contamination on the inside surface of the glass panel. Exploded View New part numbers were added to reference this iMac model •

iMac (24-inch Early 2008) — General Informatio 10 General Information Product View What’s New The iMac (24-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: 2.8 or 3.06 GHz (optional) Intel Core 2 Duo processor • 1066 MHz front side bus • Mac OS X version 10.5.2 Leopard • 2 GB and 4 GB memory options, PC2-6400 (800 MHz) DDR2, 4 GB max •

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Apple iMac 24 Inch early 2008 Repair Manual [Improved]

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