Apple led cinema display 27inch User Manual
Here you can view all the pages of manual Apple led cinema display 27inch User Manual. The Apple manuals for Display are available online for free. You can easily download all the documents as PDF.
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....