iMac (21.5-inch Late 2009).pdf

 Apple Technician Guide

iMac (21.5-inch, Late 2009)

Updated: 2010-11-18

 Apple Inc.

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iMac (21.5-inch, Late 2009)

Contents

About This Guide

Updates 9

Updated 18 November 2010 9

Updated 5 March 2010 10

Updated 8 January 2010 10

Updated 24 November 2009 10

Updated 28 October 2009 11

Introduced 20 October 2009 11

Feedback 11

Basics

Overview 13

Identifying Features 13

Product Conigurations 14

Wireless Troubleshooting 14

Safety 15

Serial Number Location 16

Troubleshooting

General Troubleshooting 18

Wireless Troubleshooting 18

Update System Software & Firmware 18

Troubleshooting Theory 18

Hardware vs. Software 18

Common Reset Procedures 19

Power On Self Test (POST) 19

Resetting the System Management Controller (SMC) 19

Resetting Parameter RAM (PRAM) 20

Starting Up in Safe Mode 20

Diagnostics 21

Diagnostic LEDs 23

LED Functions 24

LED Startup Sequence 25

Logic Board Test Points 26

Sensor and Fan Connector Locations 27

Block Diagram 28

Symptom Charts 29

Startup and Power 29

No Power, Dead Unit 29

Won’t Start Up 31

Intermittent Shutdown 33

Kernel Panic, System Crashes 35

No Video 37

Corrupted Video 39

Burnt Smell/Odor 41

Uncategorized Symptoms 42

Display 43

Backlight Issue/No Backlight 43

Noise / Unstable Flickering 45

LCD Image Issues 47

Incorrect/Missing Colors 48

Distorted/Blurred Image 49

Pixel Anomalies 51

Vertical/Horizontal Lines 52

Non-Uniform Brightness 54

Cosmetic Defects 55

Uncategorized Symptoms 55

Mass Storage 56

Hard Drive Not Recognized 56

Hard Drive Read/Write Errors 58

Hard Drive Noisy 59

Optical Drive Not Recognized 61

Optical Drive Won’t Accept/Eject Media 62

Optical Drive Read/Write Error 63

Optical Drive Not Performing to Speciications 65

Optical Drive Noisy 66

SD Card Will Not Insert Into Slot 67

SD Card Not Recognized 68

Uncategorized Symptoms 69

Communications 70

AirPort/Bluetooth Issues 70

AirPort Card Kernel Panic 72

Ethernet Port/Device Issue 73

Wireless Input Device Doesn’t Pair 74

Wireless Input Device Loses Connection 76

Uncategorized Symptoms 78

Input/Output Devices 79

Apple Remote Inoperable 79

Audio: Microphone 81

Audio: Built-in Speakers Have Distorted Sound 82

Audio: Built-in Speakers Have No Audio 83

Camera Issues 85

FireWire Device Not Recognized 86

USB Device Not Recognized 88

Wired Keyboard Does Not Function Properly 90

Keyboard: Speciic Keys Do Not Respond 92

Wired Keyboard/Mouse Not Recognized 92

Uncategorized Symptoms 94

Mechanical 95

Noise/Hum/Vibration 95

Fan Failures / Thermal Issues 98

Stand/Hinge Issues 99

Physical Damage 100

Uncategorized Symptoms 100

Take Apart

General Information 102

Opening the Unit 102

Required Tools 102

Required Special Tools for Glass Panel 103

Cleaning Tools Starter Kit 103

Cleaning & Handling the Glass Panel 104

Do’s and Don’ts 104

Handling a Broken Glass Panel 104

How to Remove a Broken Glass Panel 105

Safety 109

Logic Board Handling 110

Note About Images in This Guide 110

Access Door 111

Memory 113

Glass Panel 115

Removal 116

Reassembly 117

Camera 120

LCD Panel 123

Handling LCD Panel 127

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