Apple Technician Guide
iMac (27-inch, Mid 2011)
Updated: 2011-08-29
Apple Inc.
© 2011 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.
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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, Mid 2011)
Contents
About This Guide
Updates 11
Updated 29 August 2011 11
Updated 22 July 2011 11
Updated 28 June 2011 11
Updated 16 June 2011 11
Updated 15 June 2011 12
Updated 10 June 2011 12
Introduced 04 May 2011 12
Feedback 12
Basics
Overview 14
Identifying Features 15
Product Configurations 15
Thunderbolt 16
Safety Precautions 17
Serial Number Location 18
Troubleshooting
General Troubleshooting 20
Update Software & Firmware 20
Wireless Troubleshooting 20
Troubleshooting Theory 20
Hardware vs. Software 20
Common Reset Procedures 21
Power On Self Test (POST) 21
Starting Up in Safe Mode 21
Resetting the System Management Controller (SMC) 22
Resetting Parameter RAM (PRAM) 22
Coin Battery Removal, Testing, and PRAM Reset 23
Recovering a Lost Firmware Password 23
Diagnostics 24
Sensor Errors 24
Sensor and Fan Connector Locations 27
Sensors on Front of Logic Board 27
Sensors on Back of Logic Board 28
Diagnostic LEDs 28
LED Functions 29
LED Startup Sequence 30
Block Diagram 31
Functional Overview: Front of Logic Board 32
Functional Overview: Back of Logic Board 33
Symptom Charts 34
Startup and Power 34
No Power 34
No Startup 36
Intermittent Shutdown 38
Kernel Panic / System Crashes 43
No Video 45
Corrupted Video 47
Burnt Smell/Odor 50
Uncategorized Symptoms 51
Display 52
Backlight Issue/No Backlight 52
Noise / Unstable Flickering 54
Incorrect/Missing Colors 58
Distorted/Blurred Image 59
Pixel Anomalies 61
Vertical/Horizontal Lines 62
Non-Uniform Brightness / Color 64
Cosmetic Issues 65
Uncategorized Symptoms 65
Mass Storage 66
Hard Drive or SSD Not Recognized 66
Hard Drive Read/Write Errors 68
Hard Drive Noisy 70
Optical Drive Not Recognized 72
Optical Drive Rejects or Does Not Accept Media 74
Optical Drive Read/Write Error 76
Optical Drive Not Performing to Specifications 78
Optical Drive Noisy 80
SD Memory Card Cannot Be Inserted Into Slot 82
SD Memory Card Not Recognized 83
Uncategorized Symptoms 84
Communications 85
AirPort Issues 85
Deep Dive 87
Bluetooth Issues 88
AirPort Card Kernel Panic 90
Ethernet Issues 91
Wireless Input Device Does Not Pair 93
Uncategorized Symptoms 95
Input/Output Devices 96
Thunderbolt Not Recognized 96
Thunderbolt Target Disk Mode Issues 97
Thunderbolt Target Display Mode Issues 100
Apple Remote Issues 104
Distorted Audio From Internal Speaker(s) 108
No Audio From Internal Speaker(s) 109
Camera Issues 111
USB Port Not Recognized 114
Wired Keyboard Does Not Work Properly 116
Keyboard: Specific Keys Do Not Respond 118
Wired Keyboard/Mouse Not Recognized 118
Wireless Input Device Does Not Pair 120
Apple Wireless Mouse/Magic Trackpad Erratic Tracking 122
Wireless Input Device Loses Connection 123
Apple Battery Charger Does Not Charge Batteries 125
Deep Dive
Uncategorized Symptoms 125
Mechanical 127
Noise/Hum/Vibration 127
Fan Failures / Thermal Issues 130
Stand/Hinge Issues 132
Uncategorized Symptoms 132
Take Apart
General Information 134
Opening the Unit 134
Required Tools 134
Required Special Tools for Glass Panel 135
Cleaning Tools Starter Kit 135
Cleaning & Handling the Glass Panel 136
Do’s and Don’ts 136
Handling a Broken Glass Panel 137
How to Remove a Broken Glass Panel 137
Safety 142
EMI Tape 143
Logic Board Handling 144
Reassembly Steps 144
Note About Images in This Manual 144
Screw Sizes 144
Access Door 145
Memory 147
Removal 148
Reassembly 149
Glass Panel 150
Removal 151
Reassembly 152
EMI Tape 155
LCD Panel 156
Removal 157
Handling the Panel 162
Reassembly 163
Battery 167
Removal 168
Reassembly 168
Camera 170
Removal 171
Reassembly 172
Vertical Sync Cable (Vsync)/Temp Sensor 173
Removal 174
Reassembly 176
DisplayPort Cable 178
Removal 179
Reassembly 180
DisplayPort Power Cable 182
Removal 183
Reassembly 183
AirPort Antenna, Left 185
Removal 186
Reassembly 187
AirPort Antenna, Right 188
Removal 189
Reassembly 190
Audio Ports and Cable 191
Removal 192
Reassembly 193
AirPort Card 194
Removal 195
Reassembly 196
Bluetooth Antenna 197
Removal 198
Reassembly 198
Bluetooth Board 199
Removal 200
Reassembly 200
LED Backlight Board 201
Reassembly 203
Power Supply 204
Removal 205
Reassembly 206
Backlight Pressure Wall 207
Removal 208
Reassembly 208
Power Supply/Hard Drive Pressure Wall 209
Removal 210
Reassembly 210
Hard Drive 212
Removal 213
Reassembly 213
Reinstalling Software That Came with the Computer 214
Optical Drive 215
Removal 216
Reassembly 217
Optical Drive Data Cable 219
Removal 220
Reassembly 221
Optical Drive Sensor Cable 222
Solid State Drive (SSD) 224
Removal 225
Reassembly 226
Reinstalling Software That Came with the Computer 226
Optical Drive Fan 229
Removal 230
Reassembly 230
SD Card Reader 231
Removal 232
Reassembly 232
SD Card Reader Cable 233
Removal 234
Reassembly 234
IR Board and Cable 235
Removal 236
Reassembly 237
Logic Board 238
Removal 239
Handling the Logic Board 242
Reassembly 243
SSD Data Cable 249
Removal 250
Reassembly 251
Video Card 252
Removal 253
Reassembly 254
Optical/MXM Pressure Wall 255
Removal 256
Reassembly 256
Hard Drive Data Cable 257
Removal 258
Reassembly 259
Hard Drive Power Cable 260
Removal 261
Reassembly 262
Right Speaker 263
Removal 264
Reassembly 265
CPU Fan 266
Removal 267
Reassembly 268
Ambient Temp Sensor 270
Removal 271
Reassembly 272
Left Speaker 273
Removal 274
Reassembly 275
Hard Drive Fan 277
Removal 278
Reassembly 278
Mechanism Cover 279
Removal 280
Reassembly 281
Stand 282
Removal 283
Reassembly 284
Mechanism 286
Removal 287
Reassembly 287
Bluetooth/Camera/Sensor Cable 288
Removal 289
Reassembly 291
DC Power Cable 294
Removal 295
Reassembly 295
Rear Housing 296
Reassembly 297
Additional Procedures
Retrieving Mechanism 300
Views
Exploded Views 305
Exploded View #1 305
Exploded View #2 306
Exploded View #3 307
External Views 308
Rear View 308
Ports 309
Internal Views 310
Components Below LCD 310
Components Below Logic Board 311
Logic Board, Front Side 312
Logic Board, Back Side 313
Screw Chart 314
© 2011 Apple Inc. All rights reserved.
Apple Technician Guide
About This Guide
iMac (27-inch, Mid 2011)
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Description
If your Apple iMac 27 inch Mid2011 needs repair or parts replaced, you can save money by repairing it yourself with this official service and repair manual. This manual contains product information, disassembly and assembly instructions, troubleshooting guidance, repair parts information, replace parts details, exploded views, and more. It includes illustrated high-quality pictures and step-by-step instructions used in service shops.
Format: PDF
Pages: 316
Language: English
Compatible: Windows/Mac
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