Apple led cinema display 27inch User Manual

							 Apple Technician Guide
LED Cinema Display (27-inch)
  Updated: 2010-11-18  
						

							 Apple Inc. 
© 2010 Apple Inc. All rights reserved.
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							LED Cinema Display (27-inch)
Contents
About This Guide
Updates 7
Updated 18 November 2010  7
Introduced 24 September 2010  7
Feedback 7
Basics
Overview 9
Identifying Features  9
System Requirements  9
Product Configurations  9
Safety Precautions 10
Serial Number Location  11
Serial Number on Stand 11
Serial Number on Mechanism  11
Troubleshooting
General Troubleshooting 13
Troubleshooting Theory 13
Update System Software & Firmware  13
Display Adapters  13
Check Audio Features of Connected Computer  13
Functional Overview  14
Block Diagram  15
Test Points Diagram  16
Symptom Charts 17
Startup and Power Issues  17
Dead Unit / No Power 17
MagSafe Adapter – No Power  20
Sleep/Wake Issue  21
Uncategorized Symptoms  22  
						

							Display Issues 23
Blank / No Video, No Backlight  23
Noise / Unstable Flicker  26
Unstable Brightness / Brightness Progressively Getting Low  28
LCD Image Issues  30
Physical Damage  35
Uncategorized Symptoms  35
Input/Output Issues 36
USB Issues 36
Camera Issues  38
Audio Issues  39
Uncategorized Symptoms  42
Mechanical Issues 43
Noise / Hum / Vibration  43
Burnt Smell / Odor  44
Fan Failures / Thermal Issues  45
Mechanical Physical Damages  46
Uncategorized Symptoms  46
Take Apart
General Information 48
Opening the Unit 48
Required Tools  48
Required Special Tools for Glass Panel  48
Cleaning Tools Starter Kit  49
Cleaning & Handling Glass Panel  49
Do’s and Don’ts  49
Handling a Broken Glass Panel  49
Safety  54
Reassembly Steps  54
Note About Images in This Guide  54
Stand 55
Removal  56
Reassembly  57
Glass Panel  58
Removal 59
Reassembly  60
LCD Panel 63
Handling LCD Panel  67
EDID Reset Tool  68
LCD Function Cable  69
LCD Temp Sensor Cable  71  
						

							LCD Ground Cable 73
Camera  75
EEPROM Reset Tool  77
Camera Cable 79
Power Supply  80
DC Power Cable  82
Fan  84
Removal  87
Ambient Temp Sensor Cable  87
Logic Board  88
Logic Board Connectors  91
EDID Reset Tool  92
Left Speaker 93
Right Speaker  95
Subwoofer  97
All-in-One Cable  99
Mechanism  102
Rear Housing  105
Additional Procedures
Retrieving Mechanism  108
Views
Exploded View 113
Screw Chart  114
Internal Views  115
Photo of Components below LCD  115
External Views 116
Front View 116
Rear View  117
I/O Ports  117
All-In-One Cable  117  
						

							© 2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
About This Guide
LED Cinema Display (27-inch)   
						

							LED Cinema Display (27-inch) — Updates 7 2010-11-18
Updates
Updated 18 November 2010
Take Apart
• LCD Panel and Logic Board: Added instructions to download and run the EDID Reset Tool 
after replacing either the LCD panel or logic board.
Introduced 24 September 2010
Feedback
We want your feedback to help improve this and future Technician Guides!   
Please email any comments to:  [email protected]   
						

							© 2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
Basics
LED Cinema Display (27-inch)   
						

							LED Cinema Display (27-inch) Basics — Overview 9 2010-11-18
Overview
Identifying Features
The LED Cinema Display (27-inch) is an active-matrix liquid crystal display with LED backlight 
that includes a built-in iSight camera with microphone and a 2.1 speaker system (49 watts 
maximum). It supports resolutions up to 2560 by 1440 pixels. The all-in-one cable creates 
a docking station for portable computers, providing a universal MagSafe (up to 85W ), Mini 
DisplayPort with audio support, and three self-powered USB 2.0 ports.
The unit has no buttons. Power is controlled by the state of the connected computer. It is OFF if 
it detects the DisplayPort source is powered off. It is in Sleep if it detects the DisplayPort source 
is powered but does not send a video signal (i.e., Display Sleep). It is ON when the DisplayPort 
source sends a valid video signal. Brightness and speaker volume are controlled via System 
Preferences in Mac OS X.
System Requirements
The LED Cinema Display (27-inch) works with Mac computers running Mac OS X 10.6.4 or later 
that have a Mini DisplayPort connector.
Product Configurations
For product configurations, refer to AppleCare Tech Specs: http://support.apple.com/specs/  
						

							LED Cinema Display (27-inch) Basics — Safety Precautions 10 2010-11-18
Safety Precautions
Warning: HIGH VOLTAGE: The AC/DC power supply board and logic board remain powered 
up whenever the system is plugged in, whether or not system has been turned on. Use 
extreme caution when troubleshooting system with the glass panel removed.