Apple led cinema display 27inch User Manual

LED Cinema Display (27-inch) Symptom Charts — Display Issues 31 2010-11-18
2. Verify if issue is bright or dark 
dot pixel anomalies. YesGo to pixel anomalies.
No Go to step 3.
3.   Verify if issue is non-uniform 
brightness. Yes
Go to non-uniform brightness.
No Go to step 4.
4.  Verify if issue is incorrect/
missing colors.  Yes
Go to incorrect/missing colors.
No Go to step 5.
5.   Verify if issue is distorted/
blurred image.  Yes
Go to distorted/blurred image.
No Go to step 6.
6.  Verify if issue is...

LED Cinema Display (27-inch) Symptom Charts — Display Issues 32 2010-11-18
Deep Dive: Non-Uniform Brightness
Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
CheckResultAction Code
1.   Determine if brightness 
uniformity issue is visible after 
display has warmed up for a 
few minutes. Yes
Go to step 2.
No Display backlight can take a 
few minutes to stabilize. 
2.  Display user-provided 
examples showing brightness 
uniformity issue. Determine if 
issue appears...

LED Cinema Display (27-inch) Symptom Charts — Display Issues 33 2010-11-18
4. Remove glass and LCD panel 
screws, lift LCD panel and verify 
that all connections between, 
all-in-one cable, LCD, and 
logic board are secure. See 
Functional Overview .Yes
Go to step 5.
No Reseat connections, replace 
damaged cable(s) as needed. 
Retest.
5.   Set desktop pattern in System 
Preferences to “solid gray light.” 
Verify if incorrect/missing color 
issue affects entire display. Yes
Suspect poor video 
connection....

LED Cinema Display (27-inch) Symptom Charts — Display Issues 34 2010-11-18
Deep Dive: Vertical/Horizontal Lines
Unlikely cause: logic board, power supply, fan, camera, speakers, subwoofer, microphone
CheckResultAction Code
1.   Verify display’s USB hub and 
built-in camera are listed in the 
System Profiler’s USB device 
tree. Yes
Power supply and USB 
communication appear OK.  
Go to step 3.
No Go to step 2.
2.  Unplug and replug the Mini 
DisplayPort connector into 
a supported powered-up 
portable...

LED Cinema Display (27-inch) Symptom Charts — Display Issues 35 2010-11-18
Physical Damage
Quick Check
SymptomQuick Check
Physical Damage
•  Cracked LCD
•  Scratched LCD polarizer
•  Scorched or melted LCD
•  Impact damage to LCD, glass or 
rear housing
1.  Determine damage caused by user/technician 
environment, accidental damage, or abuse.
2.  Inform user/technician the failures are not 
covered by Apple warranties. Refer to  
http://www.apple.com/legal/warranty
Uncategorized Symptoms
Deep Dive
Check...

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 36 2010-11-18
Input/Output Issues
USB Issues
Unlikely cause:  LCD panel, fan, camera, speakers, subwoofer, microphone
Quick Check
SymptomsQuick Check
USB Issues
•  External USB device(s) not 
recognized
•  Wired USB keyboard/mouse 
not recognized
•  No audio output through 
display speakers (when using 
USB audio) 1.
  Check USB device on a known-good system.
1.   Verify display’s USB and Mini DisplayPort 
connectors are plugged into...

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 37 2010-11-18
3.  Remove glass and LCD panel 
and verify USB uplink cable 
connection to logic board 
is secure. See Functional 
Overview. Yes
If connections are secure and 
USB ports still do not function 
correctly, go to step 4.
No Reseat connector and retest.
4.  Disconnect USB cable from 
logic board and from attached 
computer. Inspect connectors 
and cable under magnification 
for pinched cables and 
damaged/bent pins.  Yes
Replace...

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 38 2010-11-18
Camera Issues
Unlikely cause:  LCD panel, power supply, fan, speakers, subwoofer, microphone
Quick Check
SymptomsQuick Check
Camera Issues
•  Camera not detected
•  No green LED for camera
•  Excessive blooming
•  Poor white balance
•  Poor focus
•  Image distortion 1.
  Verify display’s USB and Mini DisplayPort 
connectors are plugged into known-good 
powered-up supported system with up-to-date 
system software.
2.  Run...

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 39 2010-11-18
Audio Issues
Unlikely cause: power supply, fan, camera
Quick Check
SymptomsQuick Check
Audio Issues
•  Internal speakers not 
recognized (through USB 
audio or Mini DisplayPort 
connections)
•  No sound
•  Garbled sound
•  No bass
•  No treble
•  Sound seems to come from 
only one side
•  Microphone not working
1.  Conect display to a known-good supported 
powered-up system with up-to-date system 
software. 
2.  For audio...

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 40 2010-11-18
3.  Verify that issue only happens 
when playing audio through 
the DisplayPort audio. YesVerify that system model 
supplies an audio signal 
through Mini DisplayPort 
(see kBase #TS3065: Mac 
computers: HDMI audio 
doesn’t work with some 
adapters for list of models 
which support it):
 
-If the system supports 
audio through DisplayPort, 
go to step 8 for specific 
troubleshooting.  
-If computer does not support 
audio...