2009 Apple iMac 27 Inch Late Service & Repair Manual

 Apple Technician Guide iMac (27-inch, Late 2009) 2009-12-15

 Apple Inc. © 2009 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 (27-inch, Late 2009) Contents About This Guide Updates 10 15 December 2009 1 0 20 November 2009 1 0 11 November 2009 1 0 28 October 2009 1 1 27 October 2009 1 1 Apple Technician Guide introduced 20 October 2009 1 1 Feedback 11 Basics Overview 1 3 Identifying Features 14 Product Conﬁgurations 14 Wireless Troubleshooting 14 Safety Precautions 1 5 Serial Number Location 16 Troubleshooting General Troubleshooting 1 8 Wireless Troubleshooting 18 Update System Software & Firmware 18 Troubleshooting Theory 18 Hardware vs. Software 1 9 Power On Self Test (POST) 19 Resetting the System Management Controller (SMC) 1 9 Resetting Parameter RAM (PRAM) 20 Starting Up in Safe Mode 20 Diagnostics 2 1 Diagnostic LEDs 23 Location of Diagnostic LEDs 24 LED Startup Sequence 26 Logic Board Test Points 27 Sensor and Fan Connector Locations 28

Block Diagram 29 Symptom Charts 30 Startup and Power 30 No Power, Dead Unit 30 Won’t Start Up 32 Intermittent Shutdown 34 Kernel Panic, System Crashes 36 No Video 38 Corrupted Video 40 Burnt Smell/Odor 43 Uncategorized Symptoms 44 Display 45 Backlight Issue/No Backlight 45 Noise / Unstable Flickering 47 LCD Image Issues 49 Incorrect/Missing Colors 50 Distorted/Blurred Image 5 1 Pixel Anomalies 53 Vertical/Horizontal Lines 54 Non-Uniform Brightness 56 Cosmetic Defects 57 Uncategorized Symptoms 57 Mass Storage 58 Hard Drive Not Recognized 58 Hard Drive Noisy 6 1 Optical Drive Not Recognized 63 Optical Drive Won’t Accept/Eject Media 64 Optical Drive Read/Write Error 65 Optical Drive Not Performing to Speciﬁcations 67 Optical Drive Noisy 68 SD Card Will Not Insert Into Slot 69 SD Card Not Recognized 70 Uncategorized Symptoms 7 1 Communications 72 AirPort/Bluetooth Issues 72 AirPort Card Kernel Panic 74 Ethernet Port/Device Issue 75 Wireless Input Device Doesn’t Pair 76 Wireless Input Device Loses Connection 78 Input/Output Devices 8 1 Apple Remote Inoperable 8 1 Audio: Microphone 83 Audio: Built-in Speakers Have Distorted Sound 84 Audio: Built-in Speakers Have No Audio 85 Camera Issues 87

FireWire Device Not Recognized 88 USB Device Not Recognized 90 Wired Keyboard Does Not Function Properly 92 Keyboard: Speciﬁc Keys Do Not Respond 94 Wired Keyboard/Mouse Not Recognized 94 Uncategorized Symptoms 96 Mechanical 97 Noise/Hum/Vibration 97 Fan Failures / Thermal Issues 100 Stand/Hinge Issues 10 1 Physical Damage 102 Uncategorized Symptoms 102 Take Apart General Information 104 Opening the Unit 104 Required Tools 104 Cleaning & Handling the Glass Panel 106 Do’s and Don’ts 106 Handling a Broken Glass Panel 107 Safety 11 2 Logic Board Handling 11 3 Reassembly Steps 11 3 Note About Images in This Manual 11 3 Screw Sizes 11 3 Access Door 11 4 Memory 11 6 Removal 11 7 Reassembly 11 7 Glass Panel 11 8 Removal 11 9 Reassembly 120 Camera 123 LCD Panel 125 Removal 126 Reassembly 129 Vertical Sync Cable 131 LCD Temp Sensor Cable 132 DisplayPort Cable 133

Audio Ports and Cable 134 Bluetooth Antenna 136 AirPort Antenna 138 Bluetooth Board 140 AirPort Card 142 AirPort Cable 144 AirPort Carrier Board 146 LED Backlight Board 148 Power Supply 150 Removal 15 1 Reassembly 152 Backlight Pressure Wall 153 Power Supply/Hard drive Pressure Wall 155 Removal 156 Reassembly 156 Hard Drive 158 Removal 159 Reassembly 160 Hard Drive Sensor Cable 161 Removal 162 Reassembly 162 Optical Drive 163 Removal 164 Reassembly 166 Optical Sensor Cable 168 Optical Drive Fan 170 SD Board 172 SD Card Cable 17 4 IR Board 176 Removal 177 Logic Board 178 Removal 179

Reassembly 183 Video Card 187 Hard Drive Data Cable 190 Removal 19 1 Optical Drive Data Cable 193 Removal 194 Battery 195 Removal 196 Reassembly 196 Optical Pressure Wall 197 Right Speaker 199 CPU Fan 201 Removal 202 Reassembly 203 Ambient Temp Sensor 204 Removal 205 Reassembly 205 Left Speaker 206 Removal 207 Reassembly 207 Hard Drive Fan 209 Mechanism Cover 211 Mechanism 21 3 Bluetooth Cable 21 5 Cable, AC/DC Power/Backlight/SATA 217 Camera Cable 219 Microphone Cable 222 Rear Housing 223 Stand 224 Removal 225 Reassembly 226 Additional Procedures Retrieving Mechanism 229

Views Exploded Views 234 Exploded View #1 234 Exploded View #2 235 Exploded View #3 236 External Views 237 Rear View 237 Ports 238 Internal Views 239 Components Below LCD 239 Inside Rear Housing 239 Logic Board, Top Side 240 Logic Board, Bottom Side 240 Screw Chart 241

iMac (27-inch, Late 2009) About This Guide — Updates 10 2009-12-16 Updates 15 December 2009 Troubleshooting: General Troubleshooting: Updated Apple Service Diagnostic and Apple Hardware Test • version numbers, updated Apple Hardware Test error code table. Startup Power and Display chapters: Updated Flickering/No Video/ Backlight Issue/ • Corrupted Video topics to alert technicians to check: Mac OS X version installed is the build version supported on the hardware. See • kBase #TS3101: Mac (Late 2009): Using the correct Mac OS X system software. Cable connections • on back of LCD panel; check for signs of damage, corrosion, or pinched wires. Reseat/replace DisplayPort cable and Vertical sync cable when instructed. 20 November 2009 Troubleshooting: • Mechanical: Fan noise issues: updated two topics, “Noise/Hum/Vibration” and “Fan • Failures/Thermal Issues” with the following information: Check: Verify if any tape, gasket, cable label, or cable is touching the fan blades and • causing a ticking noise. Actions: Secure the material so it doesn’t touch fan blades. If tape adhesive has lost its • stickiness, replace that section of tape. 11 November 2009 Take Apart: General Information: Added graphics to topic, “How to Remove a Broken Glass Panel.” • Hard drive: Added information on the Western Digital drive and sensor cable. Orient the • drive with its circuit board facing up and connect the sensor cable to the hard drive pins, leaving the 2 left pins unconnected (exposed). Views, Exploded Views: Added AirPort (922-9286) and Bluetooth(922-9285) antennas • Added parts unique to the iMac (27-inch, Quad Core, Late 2009) • Skin temp sensor 922-9287 • SDRAM DIMMs, 661-5453 and 661-5454 • Power supply, 661-5468 • Logic boards, 661-5428 and 661-5429 • Optical drive, • 922-5284

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2009 Apple iMac 27 Inch Late Service & Repair Manual

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