imac_21_late09.pdf

 Apple Technician Guide

iMac (21.5-inch, Late 2009)

Updated: 2009-11-24

 Apple Inc.

Under the copyright laws, this document may not be copied, in whole or in part, without the

written consent of Apple.

Every efort has been made to ensure that the information in this document is accurate. Apple

is not responsible for printing or clerical errors.

Apple

1 Ininite 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 (21.5-inch, Late 2009)

Contents

About This Guide

Updates 9

Updated 24 November 2009 9

Updated 28 October 2009 9

Introduced 20 October 2009 9

Feedback 9

Basics

Overview 11

Identifying Features 11

Product Conigurations 12

Wireless Troubleshooting 12

Safety 12

Serial Number Location 13

Troubleshooting

General Troubleshooting 15

Wireless Troubleshooting 15

Update System Software & Firmware 15

Troubleshooting Theory 15

Hardware vs. Software 15

Common Reset Procedures 16

Power On Self Test (POST) 16

Resetting the System Management Controller (SMC) 16

Resetting Parameter RAM (PRAM) 17

Starting Up in Safe Mode 17

Apple Service Diagnostics 18

Diagnostic LEDs 19

LED Functions 20

LED Startup Sequence 21

Logic Board Test Points 22

Sensor and Fan Connector Locations 23

Block Diagram 24

Symptom Charts 25

Startup and Power 25

No Power, Dead Unit 25

Won’t Start Up 27

Intermittent Shutdown 29

Kernel Panic, System Crashes 31

No Video 33

Corrupted Video 34

Burnt Smell/Odor 37

Uncategorized Symptoms 38

Display 39

Backlight Issue/No Backlight 39

Noise / Unstable Flickering 41

LCD Image Issues 43

Incorrect/Missing Colors 44

Distorted/Blurred Image 45

Pixel Anomalies 47

Vertical/Horizontal Lines 48

Non-Uniform Brightness 50

Cosmetic Defects 51

Uncategorized Symptoms 51

Mass Storage 52

Hard Drive Not Recognized 52

Hard Drive Read/Write Errors 54

Hard Drive Noisy 55

Optical Drive Not Recognized 57

Optical Drive Won’t Accept/Eject Media 58

Optical Drive Read/Write Error 59

Optical Drive Not Performing to Speciications 61

Optical Drive Noisy 62

SD Card Will Not Insert Into Slot 63

SD Card Not Recognized 64

Uncategorized Symptoms 65

Communications 66

AirPort/Bluetooth Issues 66

AirPort Card Kernel Panic 68

Ethernet Port/Device Issue 69

Wireless Input Device Doesn’t Pair 70

Wireless Input Device Loses Connection 72

Uncategorized Symptoms 74

Input/Output Devices 75

Apple Remote Inoperable 75

Audio: Microphone 77

Audio: Built-in Speakers Have Distorted Sound 78

Audio: Built-in Speakers Have No Audio 79

Camera Issues 81

FireWire Device Not Recognized 82

USB Device Not Recognized 84

Wired Keyboard Does Not Function Properly 86

Keyboard: Speciic Keys Do Not Respond 88

Wired Keyboard/Mouse Not Recognized 88

Uncategorized Symptoms 90

Mechanical 91

Noise/Hum/Vibration 91

Fan Failures / Thermal Issues 94

Stand/Hinge Issues 95

Physical Damage 96

Uncategorized Symptoms 96

Take Apart

General Information 98

Opening the Unit 98

Required Tools 98

Required Special Tools for Glass Panel 99

Cleaning Tools Starter Kit 99

Cleaning Tool Resources 99

Cleaning & Handling the Glass Panel 100

Do’s and Don’ts 100

Handling a Broken Glass Panel 100

How to Remove a Broken Glass Panel 101

Safety 105

Logic Board Handling 106

Note About Images in This Guide 106

Access Door 107

Memory 109

Glass Panel 111

Removal 112

Reassembly 113

Camera 116

LCD Panel 118

Vertical Sync Cable 122

LCD Temp Sensor Cable 123

LVDS Cable 124

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