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Hello i am new here, i have a problem: My Apple Cinema Display won’t turn on again. The USB and iSight Camera does NOT work. It won’t be recognized by my mac (nothing happens at the Mac-side). It still can charge the Mac. The fan is spinning. I measured the voltages on the Logic Board an they are all ok (i use the Apple Technicians Guide for help). All cables are connected and the boards looks like new. Can anybody please help me? Sorry for my bad english, i am from Austria. PS: ich habe das Display-Kabel (das interne) auf Durchgang überprüft und es passt. Best regards and thanks for helping! Mike Update 21.2: Hello, im tested a few things on the logicboard and found something strange. When iam unplug the cable which goes from the logicboard top to the Panel, i have 24,3 Volt on TP11 and the fan is spinning. When i plug in the cable an move it slightly, then the fan stops to spinn and i have only 14,8 Volt. So it looks like the cable is defect, but how can this happens? The cable was never in motion. And the Mac still dont find the Display, with or without the cable :( Thanks for help! Update (17.3.2017) I have taken some pictures of the LCD board and the Chips look alright. Next week i want to measure the voltage with the oscilloscope, maybe the power supply has a defect ELKO which drops the voltage.
Hallo Robert, danke für deine Antwort. Anbei die Fotos. Ich werde in 2 Wochen das Netzteil in die Arbeit mitnehmen und testen, ob vielleicht ein ELKO kaputt ist. Ich hoffe die Fotos helfen! Danke und lg
I still today continue using my Mac display, but I have to occasionally unplug replug the power cable, so the problem still remains. I have ordered two LED strips to replace them when I get time to do it. I realised that adjusting the screen brightness to full before connecting the display to macbook helps for the issue often, but not always.
I just fixed a different issue in my 24" CINEMA displaz so I had to dig pretty deep into the display manuals and IC chips on the logic board. Maybe if you send me the exact details of your display, see http://www.everymac.com/ultimate-mac-loo… Then I can get an image what device you exactly have. Can you also take a high precision image of the IC chip side of your logic board, to verify that no chips are burned. Then if possible try to connect another cable to the Logic board to rule out the cable fault. PS: ich kann auch deutsch. Update (03/08/2017) So you have exactly the same device as I do. OK. Now, you say that the Fan spinsthe monitor is not recognized by the system, no iSight and no USB hubThe test voltages are ok, according to the service manual.The charging is still working Check if you have a faint image on the LCD, no backlight? Did the display work before? or was it dead already when you got it? Try to lay it horizontal and see if it works. It sounds little bit like a logic board problem. OR possibly a LCD problem. So please before anything, inspect the LCD panel PCB board, sometimes the IC there burns.
The power supply is the problem with the LED Cinema Display 24. It should deliver 90 watts. The electrolytic capacitors lose their power after years and then the power supplies only 88 Wat or less. Therefore, the monitor remains black.
