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20", 23", and 30" LCD Display introduced in 2004 discontinued in 2010.

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23" Apple Cinema HD Display does not turn on - no blink

About a year ago I bought a used Apple Cinema Display 23” (A1082) and a Cinema Display 90W power adapter (A1097). The screen has been working flawlessly until recently, when the screen stopped working. In the beginning, although the screen didn’t turn on, the power lamp would light up, when the power button was touched. Now the light is completely switched off.

What I find particularly weird is that whenever I plug the Cinema Display’s USB connector into my laptop and my external Apple USB Keyboard into the Cinema Display’s USB inputs, the external keyboard is fully functioning and able to control my laptop. I guess this could mean that the screen does get power to some extent and is not fully dead? I wanted to test the power adapter with a multimeter, but does this mean that I need to take the power adapter apart to do so?

I’ve tried ‘the Jacobeon method’ (covering the middle pin with tape) with no success. Furthermore, I’ve considered buying a 150W adapter to test if it can make the screen work, but as I’ve only spent 35$ on the screen and 90W adapter in total I’m a bit hesitant to spend more than 50 $ on Ebay on a used power adapter that may not fix the problem. It could also be a faulty logic board….

What should I do? Can I fix it myself (I’m a rookie in electronics), should I try to get it fixed by a professional or is it more reasonable to simply toss this beautiful yet fairly old screen?

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The ‘Jacobeon method’ blocking the middle power line pin of the power brick is when the displays LED is blinking in a Short - Long - Short blink. If the displays LED is not lighting at all then you have a power brick issue.

As far as the displays USB ports power can flow from the MacBook back to the display besides from the displays power adapter via the USB connection. So that is not offering anything helpful diagnostically.

Lets get a better idea on what’s happening by installing this app CoconutBattery take a snapshot with the displays MagSafe connected to your MacBook and post it here for us to see iFixitでの質問に画像を追加する方法

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Thank you for your reply, Dan!

Unfortunately my screen isn't one of the models, that has a Magsafe-cable attached (A1267 and A1316 according to Wikipedia). Any workarounds?

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Sadly, its time to try another brick to test things.

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@danj Ok, I'll try this solution, thank you for helping out.

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@mcbiernes I don't think your power adapter is the issue here. Let's see where the next steps a taking you.

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@oldturkey03 What do you think the issue could be instead and do you have any ideas to how can I test it? Thanks!

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@mcbiernes just some thoughts right now. I do not want to lead you astray etc. so for now I'll follow this and see where it takes you. It can get really convoluted if you get to many people at once giving you different ideas. I would follow through with this idea I wanted to test the power adapter with a multimeter and let us know what you get. BTW according to the manual the 90W power adapter is sufficient. Have you checked to see if the computer recognizes the display? Plug the display into a known-good computer with a known-good video card and DVI display port. Connect a second display. Start up the computer and allow enough time to finish startup. From the desktop, select the hard drive, and under the apple icon click About This Mac. Click the More Info button to open System Profiler. In the System Profile menu under Hardware, check the hub to see if the display is listed.

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@oldturkey03 Thank you for sharing your thoughts! I've tried testing the power adapter with a multimeter now and from that test it looks to be working just fine. Can't tell for sure though as I haven't got another screen that I can test it on.

Furthermore, I've tried checking for the screen under "About This Mac". No luck. The display isn't listed.

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Well, most of the time it's the transformers that die, in your case its clear the display has issues internally.

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McBiernes さん、ありがとうございました!
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