LED Cinema Display (27-inch) Troubleshooting — General Troubleshooting 14
2010-11-18
Functional Overview
A guide to connector locations, and the possible symptoms when the cable is disconnected,
mis-connected or shorted.
Power Supply
No Power, no video, no
MagSafe power, no USB
output power, no camera
input, no audio output, no
audio input, no fan
LCD Panel Control
No video, distorted
video, no Audio Output
through speakers (via
DisplayPort audio),
display brightess change
(no LCD temp feedback)
Fan
Display getting hot,
Display shutting down
when hot, fan running at
full speed, fan not running
Camera + Camera LED
+ ALS light Sensor
No Camera, no LED when
camera is used, brightness
does not adjust to a room
light level change
Microphone
No audio input when
display microphone is
selected in System
Preferences Sound Input
SubWoofer
Missing low frequencies
reproduction when display
speakers are selected in
System Preferences Sound
Left Speakers
Missing mid & high frequency reproduction on
left side when display speakers are selected in
System Preferences Sound Output
USB (from computer)
No camera
functionality , USB
devices connected not
seen, no audio input
from microphone, no
audio output through
speakers (via USB
audio)
LCD LED backlight
No backlight, uneven
backlight, flickering
backlight
Exhaust Temp sensor
Display getting hot, fan
not running, fan running
at full speed
Right Speakers
Missing mid & high frequency reproduction
on right side when display speakers are
selected in System Preferences Sound Output
USB ports (to
connected devices)
USB devices not seen,
No iPod/IPhone/iPad
charge
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