No image showing up, but everything else works, what problem it is?

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Apple LED Cinema Display 24"

24" display; Built-in iSight Camera, Microphone, and Speakers; 1920x1200 resolution. Released October 2008, identified by model number A1267.

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Tom @lovecd

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Postado: 25 de set de 2020

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No image showing up, but everything else works, what problem it is?

My 24” Cinema Display stopped displaying anything (totally darkness) recently, but everything else seems works fine, such as speakers, iSight cam, and my MacBook can still detect it. I thought it might be the all-in-one cable issue, so, I bought one used over eBay and have it replaced, but it is the same issue, black screen. I also tried using a flash light on the screen, but can’t see any images at all. So, at this stage, what’s the most possible cause? Any thoughts?

Thanks,

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@lovecd could be the LCD but I would suggest you go ahead and post some pictures of all of your parts in particular the logic board. Let's see if there are other things that cause this.

26 de set de 2020 por oldturkey03

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oldturkey03 @oldturkey03

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@lovecd could be the LCD but I would suggest you go ahead and post some pictures of all of your parts in particular the logic board. Let's see if there are other things that cause this. You should at least have a backlight even if your panel is not working.

Check the voltage on your logicboard. Between TP81 and chassis ground you should have between 23.3 and 25.7 Volt. If you don’t it is most likely the logic board not the panel.

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Thanks, will try that. A question though, if the issue is with the logic board, why I can get all other functionalities, such as iSight, speakers, USB ports working?

26 de set de 2020 por Tom

@lovecd different circuits on the logic board. They are probably separated since you wont need the video or backlight circuitry for that etc.

26 de set de 2020 por oldturkey03

Here is the update. I checked the voltage between TP81 and chassis ground, it showed some numbers, but then changed to 1 quickly. Does this mean the logic board might be the cause?

1 de out de 2020 por Tom

Yes it is possible. You need that voltage. What are the numbers on the logic board. Maybe we have luck with finding the schematic

1 de out de 2020 por oldturkey03

What do you mean the numbers on the logic board?

1 de out de 2020 por Tom

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@lovecd could be the LCD but I would suggest you go ahead and post some pictures of all of your parts in particular the logic board. Let's see if there are other things that cause this. — oldturkey03
Thanks, will try that. A question though, if the issue is with the logic board, why I can get all other functionalities, such as iSight, speakers, USB ports working? — Tom
@lovecd different circuits on the logic board. They are probably separated since you wont need the video or backlight circuitry for that etc. — oldturkey03
Here is the update. I checked the voltage between TP81 and chassis ground, it showed some numbers, but then changed to 1 quickly. Does this mean the logic board might be the cause? — Tom
Yes it is possible. You need that voltage. What are the numbers on the logic board. Maybe we have luck with finding the schematic — oldturkey03

amatsuda @amatsuda223 Rep: 453 5 1 1 · Answer 1 · 2020-09-25T23:21:52-07:00

amatsuda @amatsuda223

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The… screen? Considering you already replaced the cable and your Mac still detects it, the only assumption really left would be that the screen itself is just dead (not the whole monitor)

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I see, thanks.

26 de set de 2020 por Tom

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Apple LED Cinema Display 24"

No image showing up, but everything else works, what problem it is?

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