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© 2010 Apple Inc. All rights reserved.
Apple T
echnician Guide
Basics
iMac (27-inch, Mid 201
0)
Contents
Main
Page
iMac (27-inch, Mid 2010)
Contents About This Guide
Updates 10
Feedback 10
Basics
Symptom Charts 35
Startup and Power 35
Display 53
Mass Storage 70
Communications 86
Take Apart
General Information 125
Access Door 135 Memory 137
Glass Panel 139
Page
Page
Additional Procedures
Views
Page
Updates
Updated 9 September 2010
Updated 9 August 2010
Apple Technician Guide introduced 27 July 2010
Feedback
Page
Overview
Identifying Features
Product Congurations
Safety Precautions
Page
New Accessories Magic Trackpad
About the Indicator Light
Turn on the Trackpad
Pairing the Magic Trackpad
Installing Batteries
Apple Battery Charger
Batteries
Status Lights
Page
General Troubleshooting
Wireless Troubleshooting
Update System Software & Firmware
Troubleshooting Theory
Hardware vs. Software
Common Reset Procedures Power On Self Test (POST)
Resetting the System Management Controller (SMC)
Resetting Parameter RAM (PRAM)
Starting Up in Safe Mode
Removing the Battery, Measuring DC Voltage
Diagnostics
Sensors Errors
Page
Page
Page
Page
LED Functions
LED Startup Sequence
Logic Board Test Points
iMac (27-inch, Mid 2010) General Troubleshooting 33
2010-09-09
Functional Overview
iMac (27-inch, Mid 2010) General Troubleshooting 34
2010-09-09
Block Diagram
Refer to this diagram to see how modules are interrelated.
MLB
K22/K23 System Block Diagram
Symptom Charts
Startup and Power
No Power, Dead Unit
Page
Wont Start Up
Page
Intermittent Shutdown
Troubleshooting Shutdown Causes
Shutdown events can be categorized into four dierent areas. 1) User-related shut downs:
2) Activity-related system shut downs:
3) Power-related system shut downs:
4) Hardware-related system shut downs:
Page
Page
Page
Kernel Panic, System Crashes
Page
No Video
Page
Corrupted Video
Page
Page
Burnt Smell/Odor
Page
Display
Backlight Issue/No Backlight
Page
Noise / Unstable Flickering
Page
Page
LCD Image Issues
Deep Dive:
Page
Incorrect/Missing Colors
Page
Distorted/Blurred Image
Page
Pixel Anomalies
Page
Vertical/Horizontal Lines
Page
Non-Uniform Brightness / Color
Cosmetic Defects
Mass Storage
Hard Drive Not Recognized
Page
Hard Drive Read/Write Errors
Page
Hard Drive Noisy
Page
Optical Drive Not Recognized
Optical Drive Wont Accept/Eject Media
Optical Drive Read/Write Error
Page
Optical Drive Not Performing to Specications
Page
Optical Drive Noisy
SD Card Will Not Insert Into Slot
SD Card Not Recognized
Page
Communications
AirPort/Bluetooth Issues
Page
Page
AirPort Card Kernel Panic
Ethernet Port/Device Issue
Wireless Input Device Does Not Pair
Page
Page
Input/Output Devices
Apple Remote Inoperable
Page
Audio: Microphone
Audio: Built-in Speakers Have Distorted Sound
Audio: No Audio from Built-in Speakers
Page
Page
Camera Issues
FireWire Device Not Recognized
Page
USB Device Not Recognized
Page
Wired Keyboard Does Not Function Properly
Page
Keyboard: Specic Keys Do Not Respond
Wired Keyboard/Mouse Not Recognized
Page
Wireless Input Device Does Not Pair
Page
Page
Apple Wireless Mouse/Magic Trackpad Erratic Tracking
Wireless Input Device Loses Connection
Page
Apple Battery Charger Does Not Charge Batteries
Page
Mechanical
Noise/Hum/Vibration
Page
Page
Fan Failures / Thermal Issues
Stand/Hinge Issues
Physical Damage
Page
General Information
Opening the Unit
Required Tools
Required Special Tools for Glass Panel
Cleaning Tools Starter Kit
Cleaning & Handling the Glass Panel
Dos and Donts
Page
Page
Page
Page
Page
Safety
Page
Access Door
Page
Memory
Page
Glass Panel
1
2
3
1
2
Page
7
8
9
Camera
Page
1
2
LCD Panel
1
2
3
4
5
6
7
8
Page
Page
4
5
Page
Vertical Sync Cable (Vsync)
LED Temp Sensor Cable
DisplayPort Cable
2
3
Audio Ports and Cable
1
2
AirPort Antenna
Page
AirPort Card
Page
AirPort Carrier Board
Page
AirPort Cable
1
2
3
Bluetooth Antenna
Page
Bluetooth Board
Page
LED Backlight Board
1
2
Power Supply
1
Page
Backlight Pressure Wall
Page
Page
Page
Page
Hard Drive
Page
1
2
3
Hard Drive Sensor Cable
1
Optical Drive
Page
Page
1
2
3
Optical Sensor Cable
Page
Optical Drive Fan
Page
SD Card Reader
Page
Page
SD Card Reader Cable
Page
IR Board and Cable
1
2
3
Logic Board
1
2
3
4
Page
1
2
3
4
5
6
7
8
9
10
11
12
13
Video Card
1
2
3
1
2
Solid State Drive (SSD)
1
2
3
4
5
6
Reassembly 1
2
SSD Data Cable
1
Optical/MXM Pressure Wall
1
2
3
Hard Drive Data Cable
Page
Page
Optical Drive Data Cable
Page
Battery
Page
Right Speaker
Page
CPU Fan
Page
Page
Ambient Temp Sensor
Page
Left Speaker
Page
2
Hard Drive Fan
Page
Mechanism Cover
Page
Stand
Page
Page
4
5
Mechanism
Page
Bluetooth Cable
Page
3
Camera Cable
Page
3
Cable, AC/DC Power/Backlight/ SATA
Page
Cable, AC/DC Power/Backlight/ SATA, SSD
Page
Page
Microphone Cable
Rear Housing
1
2
Page
9
10
Page
Page
Retrieving Mechanism
Overview
Page
5
6
7
8
9
Page
Page
Page
Page
Page
Page
Ports
Page
Page
Page
Page
Screw Chart
