LED Functions 30
LED Startup Sequence 31

Logic Board Test Points 32

Functional Overview 33

Block Diagram 34

Symptom Charts 35

Startup and Power 35

No Power, Dead Unit 35
Won’t Start Up 37
Intermittent Shutdown 39
Kernel Panic, System Crashes 44
No Video 46
Corrupted Video 48
Burnt Smell/Odor 51
Uncategorized Symptoms 52

Display 53

Backlight Issue/No Backlight 53
Noise / Unstable Flickering 55
LCD Image Issues 58
Incorrect/Missing Colors 60
Distorted/Blurred Image 62
Pixel Anomalies 64
Vertical/Horizontal Lines 66
Non-Uniform Brightness / Color 68
Cosmetic Defects 69
Uncategorized Symptoms 69

Mass Storage 70

Hard Drive Not Recognized 70
Optical Drive Not Recognized 76
Optical Drive Won’t Accept/Eject Media 77
Optical Drive Read/Write Error 78
Optical Drive Not Performing to Specications 80
Optical Drive Noisy 82
SD Card Will Not Insert Into Slot 83
SD Card Not Recognized 84
Uncategorized Symptoms 85

Communications 86

AirPort/Bluetooth Issues 86
AirPort Card Kernel Panic 89
Ethernet Port/Device Issue 90
Wireless Input Device Does Not Pair 91
Uncategorized Symptoms 93

Input/Output Devices 94

Apple Remote Inoperable 94
Audio: Microphone 96