Apple led cinema display 24inch User Manual

							 Apple Technician Guide
LED Cinema Display (24-inch)
Updated: 2010-11-25  
						

							 Apple Inc.
© 2008-2010 Apple Inc. All rights reserved.
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is not responsible for printing or clerical errors.
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USA 
+ 1 408 996 1010 
www.apple.com
Apple, the Apple logo, Mac, and Macintosh are trademarks of Apple Inc., registered in the U.S. 
and other countries.   
						

							LED Cinema Display (24-inch)
Contents
About This Guide
Updates 7
Updated 25 November 2010 7
U pdated 8 February 2010  
7
U

pdated 28 October 2009  
7
In

troduced 2 December 2008  
8
Feedback 8
Basics
Overview 10
Identifying Features 1 0
System Requirements  
1
 0
Product Configurations
 
1
 0
Serial Number Location 1 1
Serial Number on Stand 11
Serial Number on Mechanism  
1
 1
Troubleshooting
General Troubleshooting 13
Troubleshooting Theory 13
Hardware vs. Software  
1
 3
Functional Overview
 
1
 4
Block Diagram
 
1
 5
Cable Routing Diagram
 
1
 6
Test Points Diagram
 
1
 7
Symptom Charts 18
Startup and Power Issues 1 8
Dead Unit / No Power 18
Burnt Smell/Odor  
2
 0
MagSafe Adapter – No Power
 
2
 1
Sleep/Wake Issue
 
2
 2
Uncategorized Symptoms
 
2
 3  
						

							Display Issues 24
Blank / No Video, No Backlight 2 4
Noise / Unstable Flicker  
2
 5
LCD Image Issues
 
2
 7
Physical Damage
 
3
 1
Uncategorized Symptoms
 
3
 1
Input/Output Issues 32
USB Issues 32
Camera Issues  
3
 3
Audio Issues
 
34
U

ncategorized Symptoms  
36
Mechanical Issues 37
Noise, Hum or Vibration 3 7
Fan Failures / Thermal Issues  
3
 8
Mechanical Physical Damages
 
3
 9
Uncategorized Symptoms
 
40
Take Apart
General Information 42
Opening the Unit 42
R equired Tools  
42
Required Special Tools for Glass Panel 42
C leaning Tools Starter Kit  
43
Cleaning & Handling the Glass Panel 43
D o’s and Don’ts  
43
Handling a B

roken Glass Panel  
43
S

afety  
48
R

eassembly Steps  
48
N

ote About Images in This Guide  
48
Glass Panel 49
Removal 50
R eassembly  
5
 1
LCD Panel 54
Handling LCD Panel 5 8
Logic Board 59
Removal 60
R eplacement  
62
Power Supply 6 3
Fan (Blower)  
65
Removal 66
R eplacement  
67  
						

							Camera 68
S ubwoofer  
70
A

C Inlet  
7
 2
All-in-One Cable
 
7
 4
Speakers
 
7
 6
Removal 77
Replacement 
7
 7
Stand 78
Mechanism
 
8
 1
Rear Housing
 
8
 3
Additional Procedures
VESA Mount 86
R etrieving Mechanism  
8
 9
Views
Exploded View 94
Scr ew Chart  
9
 5
External Views
 
96
Front View 96
Rear View  
9
 7
I/O Ports
 
9
 7
All-In-One Cable
 
9
 7
Internal View 98  
						

							© 2008-2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
About This Guide
LED Cinema Display (24-inch)   
						

							LED Cinema Display (24-inch) — Updates 7 2010-11-25
Updates
Updated 25 November 2010
“Blower” renamed to “Fan” throughout document.
Take Apart:
• 
G
 eneral Information:•
 
R
 equired Tools: Added Thermal paste syringe (Apple part #922-9625) for camera;
•
 
R
 emoved commercial screen cleaning products;
•
 
U
 pdated section “Handling a Broken Glass Panel”.
•
 
G
 lass Panel: Updated procedure and cleaning instructions; microfiber cloth should only 
be dampened with water (rather than isopropyl alcohol or commerical screen cleaning 
products).
•
 
L
 CD Panel:•
 
A
 dded caution not to press on front surface of LCD panel.
•
 
A
 dded reassembly note not to overtighten LCD screws, which could cause light 
leakage after reassembly;
•
 
A
 dded new section “Handling LCD Panel”.
•
 
C
 amera and Rear Housing: Added reassembly instructions to transfer or add thermal paste 
between camera and rear housing.
Updated 8 February 2010
Troubleshooting:
•  
G
 eneral: Test Points Diagram: Added TP61.
•
 
S
 ymptom Charts: “Dead Unit / No Power”:•
 
S
 tep 5: changed “Yes” Action to lead to Blank/No Video, Step 3;
•
 
S
 tep 8, corrected voltage for TP11 to 24.5VDC (was incorrectly noted as 15VDC); 
•
 
S
 tep 9, corrected “TP11” to “TP13”.
•
 
S
 ymptom Charts: “Camera Issues”: Added link to kBase #HT3957: “About the LED Cinema 
Display iSight Camera Firmware Update 1.0”.
Updated 28 October 2009
Added new sections:
•  
A
 bout This Guide
•
 
A
 dditional Procedures: VESA Mount
•
 
A
 dditional Procedures: Retrieving Mechanism
Basics:
•
 
R
 eplaced Technical Specifications with a link to AppleCare Tech Specs.  
						

							LED Cinema Display (24-inch) — Feedback 8 2010-11-25
Troubleshooting:
• 
G
 eneral: Updated Troubleshooting Theory section.
•
 
S
 ymptom Charts: Corrected hyperlink at top of p. 17
Take Apart:
•
 
G
 eneral: •
 
C
 onsolidated information about ESD Safety;
•
 
A
 dded information about handling and removing a broken glass panel.
•
 
S
 tand: •
 
A
 dded image showing removal of rear housing from stand; 
•
 
A
 dded note about VESA Mount procedure.
Introduced 2 December 2008
Feedback
We want your feedback to help improve this and future Technician Guides!   
Please email any comments to:  [email protected]   
						

							© 2008-2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
Basics
LED Cinema Display (24-inch)   
						

							LED Cinema Display (24-inch) Basics — Overview 10 2010-11-25
Overview
Identifying Features
The LED Cinema Display (24-inch) is an active-matrix LCD with LED backlight that includes a 
built-in iSight camera, a 2.1 speaker system, and a microphone.  The native resolution is 1920 x 
1200 pixels.  The all-in-one cable creates a docking station for portable computers, providing a 
MagSafe power connection, Mini DisplayPort video connection, and a 3-port USB hub.
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 the Mac OS.
System Requirements
The LED Cinema Display (24-inch) works with Mac computers running Mac OS X 10.5 or later 
that have a high-performance Mini DisplayPort.
Product Configurations
For product configurations, refer to AppleCare Tech Specs: http://support.apple.com/specs/