LCD Function Interface
• No power to LCD
• No LED backlight
DC In
• No power
Camera
• Not detected in USB Device Tree
• No green camera LED
• No camera video
Fan (1) & LCD (2) Temp Sensors
• Fan runs fast if sensor is:
° disconnected
° connected to wrong location on MLB
° not properly mounted or located
° faulty
Microphone
• Not detected in Sound Pref pane
• No, low, distorted audio input
Subwoofer
• No, low, distorted bass
Right & Left Speakers
• Not detected in Sound Pref pane
• No, low, distorted channel(s)
Blower (Fan)
• No rotation leading to overtemp condition
• Excessive noise/vibration due to faulty fan
* Also see Fan (1) & LCD (2) Temp Sensors
symptoms below.
LED Driver (Backlight)
• No LED backlight
• Dim or low brightness
Upstream USB
• Not detected in USB Device Tree or
System Preference panes
° iSight camera
° Sound output
° Microphone input
° LED calibration &
brightness control
° 3 x USB ports
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