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 Specifications  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

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Apple MD094LL/A manual Symptom Charts