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Apple led cinema display 27inch User Manual

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Page 11

LED Cinema Display (27-inch) Basics — Serial Number Location 11 2010-11-18
Serial Number Location
Serial Number on Stand
The LED Cinema Display (27-inch)’s serial number is located on the base of the stand. When 
replacing a stand, transfer the serial number to the new stand. 
Serial Number on Mechanism
The LED Cinema Display (27-inch)’s serial number is also located on the hinge mechanism 
inside, for users who remove the stand to use a VESA mount. When replacing a mechanism, 
transfer the serial number...

Page 12

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

Page 13

LED Cinema Display (27-inch) Troubleshooting — General Troubleshooting 13 2010-11-18
General Troubleshooting
Troubleshooting Theory
For general information on troubleshooting theory, go to GSX and find the Service Training 
course menu link. From there you can access the Troubleshooting Theory self-paced course. 
Also, refer to the following Apple Knowledge Base articles: 
kBase #TS1388: Isolating issues in Mac OS X 
kBase #HT1199: Mac OS X: How to troubleshoot a software issue
Update System Software &...

Page 14

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...

Page 15

LED Cinema Display (27-inch) Troubleshooting — General Troubleshooting 15 2010-11-18
Block Diagram
Refer to this diagram to see how modules are interrelated:  

Page 16

LED Cinema Display (27-inch) Troubleshooting — General Troubleshooting 16 2010-11-18
Test Points Diagram
Test Points for DC Power Presence
Following  are  test  points  you  can 
use  to  verify  proper  power  flow   in 
the  LED  Cinema  Display.  All  voltages 
assume  that  the  display  is  only 
plugged   into  a  power  outlet,  and 
NOT into the host computer.
How to proceed: 
•Turn  the  dial  of  your   voltmeter/
multimeter  to  measure  DC  (direct 
current).  If  your  voltmeter  requires...

Page 17

LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 17 2010-11-18
Symptom Charts
Follow steps in the order indicated below. If an action resolves the issue, retest system to verify.
Startup and Power Issues
Dead Unit / No Power
Unlikely cause: fan, camera, speakers, subwoofer, microphone
Quick Check
SymptomsQuick Check
Dead Unit / No Power
•  No power
•  No image
•  No fan spin
•  No active MagSafe LED when 
MagSafe is connected to a 
MacBook /MacBook Pro
•  No iPod/iPhone/iPad is...

Page 18

LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 18 2010-11-18
3.  Remove glass and LCD panel, 
reconnect MagSafe, DisplayPort 
and USB cables to a powered 
on computer. Set digital 
multimeter to DC and correct 
range, and verify that:
- a 23.3–25.7 V DC voltage is 
present between logic board 
test point (24 V ) and chassis 
ground (GND); this circuit 
powers LCD backlight; and 
- an 11.4-12.6 V DC voltage is 
present between logic board 
test point (12 V ) and chassis 
ground...

Page 19

LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 19 2010-11-18
8. Disconnect all connectors from 
the logic board EXCEPT the 
DC power cable. Set digital 
multimeter to DC and correct 
range, and verify that a 3.1-3.5 V 
DC voltage is present between 
logic board test point (3.3 V 
DC) and chassis ground (GND), 
then verify that a 4.8-5.5 V DC 
voltage is present between 
logic board test point (5 V DC) 
and chassis ground (GND). Yes
Power sources appear 
OK when all devices...

Page 20

LED Cinema Display (27-inch) Symptom Charts — Startup and Power Issues 20 2010-11-18
MagSafe Adapter – No Power
Unlikely cause:  LCD panel, logic board, fan, camera, speakers, subwoofer, microphone
Quick Check
SymptomsQuick Check
MagSafe Adapter – No Power
•  No power available to MagSafe 
connector
•  MagSafe connector status LED 
does not illuminate 1.
  Verify power cord and AC wall outlet. 
1.   Verify USB/Mini DisplayPort/MagSafe connectors 
are fully seated.
2.  Verify display is operating.
3....
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