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Apple led cinema display 27inch User Manual

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Page 41

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 41 2010-11-18
7.  Play a known-good sound and 
verify sound quality is good. Yes
Speakers and amplifier circuit 
are OK.
No Replace logic board. M09
8.  (DisplayPort Audio) Disconnect 
USB, and connect Mini 
DisplayPort cable to a powered-
up portable system supporting 
Audio via DisplayPort, and 
verify that  video is available on 
display. Yes
Go to step 9.
No
No Mini DisplayPort 
connection. Go to Blank / No 
Video, No Backlight.
9....

Page 42

LED Cinema Display (27-inch) Symptom Charts — Input/Output Issues 42 2010-11-18
3.  Determine if user-reported 
issue is with display’s internal 
speakers. YesGo to Audio Issues: General.
No Go to step 4.
4.  Launch System Preferences: 
Sound: Input and verify that 
Display’s Audio input (internal 
Microphone) is selected. Yes
Go to step 5.
No Select display’s internal 
Microphone and retest.
5.   Launch System Preferences : 
Sound: Input and verify that 
Input Volume is set above 
minimum. Yes
Go to...

Page 43

LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 43 2010-11-18
Mechanical Issues
Noise / Hum / Vibration
Unlikely cause:  LCD panel, logic board, all-in-one cable, camera
Quick Check
SymptomsQuick Check
Noise / Hum / Vibration
•  Buzzing noise
•  Rattling noise
•  Ticking noise
•  Squeaking noise
1.  Verify display’s USB and Mini DisplayPort 
connectors are plugged into known-good 
supported system with up-to-date system 
software.
2.  Tilt display to hinge limits to determine if...

Page 44

LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 44 2010-11-18
3.  Determine if noise issue sounds 
like fan is running unusually 
fast. Yes
Replace ambient temp sensor 
cable. X03
No Go to step 4.
4.  Remove fan and inspect blades 
for damage or obstructions. Yes
Replace fan. X23
No Go to step 5.
5.   Remove fan and rotate blades. 
Verify that fan blades spin 
smoothly without interference 
from fan housing. Yes
Go to step 6.
No Replace fan. Retest. X23
6.  Reinstall fan while carefully...

Page 45

LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 45 2010-11-18
Fan Failures / Thermal Issues
Quick Check
SymptomsQuick Check
Fan Failures / Thermal Issues
•  Washed out image
•  No, slow, fast fan spin
•  Excessive heat exhaust
•  Eventual shutdown of display 1.
  Remove air vent obstructions.
2.  Verify display is functional.
3.   Ensure the display on a stable work surface that 
allows for adequate air circulation under and 
around the unit.
Deep Dive
Check ResultAction Code
1.   Verify...

Page 46

LED Cinema Display (27-inch) Symptom Charts — Mechanical Issues 46 2010-11-18
Mechanical Physical Damages
Quick Check
SymptomsQuick Check
Mechanical Physical Damages
•  Broken glass
•  Bent stand
•  Broken hinge
•  Stripped screw/head/boss
•  Dent or scratch to exterior
•  Damaged cable/connector
1.  Determine damage caused by user/technician 
environment, accidental damage, or abuse.
2.  Inform user/technician the damage is not 
covered by Apple warranties. Refer to...

Page 47

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

Page 48

LED Cinema Display (27-inch) Take Apart — General Information 48 2010-11-18
General Information
Opening the Unit
• The LED Cinema Display (27-inch) has a glass panel that attaches to the front, which must 
be removed prior to replacing any module on the unit.
•  Important: The glass panel should only be removed by Apple-authorized technicians.  
Follow all cleaning and handling instructions to prevent damaging glass panel or LCD panel.
•  Follow ESD precautions when glass panel is removed.
For more...

Page 49

LED Cinema Display (27-inch) Take Apart — General Information 49 2010-11-18
Cleaning Tools Starter Kit
The following tools are offered in the cleaning starter kit (076-1277):
• Suction cups, 1 pair
•  Gloves, lint-free, anti-static, 2 pairs
•  Sticky silicone roller (6-inch) to clean glass panel
•  Sticky sheets to clean the silicone roller, 2 pads
•  Polishing cloths, clean, anti-static, optical-grade micro-fiber “terry” style, 5 cloths
•  Microfoam bag to store glass panel, 5 bags
•  ESD bag for LCD...

Page 50

LED Cinema Display (27-inch) Take Apart — General Information 50 2010-11-18
How to Remove a Broken Glass Panel
A shattered panel can be removed using safety glasses, packing tape, and leather gloves. 
1.  Put on the safety glasses and leather gloves. 
2.  Lay the computer on a smooth, clean work surface.
3.   Peel protective covering off the front of the glass. Remove and discard any large pieces of 
broken glass.  
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