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24英寸显示器,内置iSight 摄像头,麦克风和扬声器。 1920*1200分辨率。 发布于2008年10月 型号为A1267

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Backlight not working. Camera, Sound, USB, and LCD are functional.

Hi everyone,

I have a 24” LED Cinema Display that stopped working properly. The monitor is able to power my laptop, utilize the USB ports with data, sound works, and the iSight camera works. I isolated the issue to the backlight as I shined a light on the screen and I can see my desktop mirrored.

Interestingly, when I first plug in the display while connected to my Macbook Air, the screen will flicker for a split second so I assume that the backlight still works and that is NOT the issue but I am not entirely sure. When the display is on, I do not see a dim glow at the bottom even at the highest brightness.

I opened up the display to make sure the the cables were not pinched or anything and fully connected but I am at a loss right now. I unscrewed the power supply and logic board and didn’t notice any bulging capacitors after doing a very quick glance. I noticed on the power supply board there was a white chalk like substance covered on the left portion of the board and I cleaned it with isopropyl alcohol but didn’t notice anything else.

I was trying to follow a similar guide on this website but I am not sure where to start. Wondering if it could be a capacitor issue, or voltage issue?

Should I just cut my losses and recycle the machine?

Thank you!

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2个答案

What do you see when you shine a flashlight into the display, place it on the glass at a sharp angle do you see the faint image of your desktop and its icons? You may want to do this in a darkened room.

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There is an image on the screen but no backlight. I've isolated the issue to the backlight and I am not sure if its a capacitor, backlight function cable, or backlights themselves. When I first plug in the display, it will flicker. I opened up the display and did not see any bulging capacitors but I did a very quick glance. I have highlighted all my steps I have taken in my original post but I am not sure where to proceed next.

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@johnnyn - At this point you'll need to measure the voltage of the backlight power feet to the display. Do you have access to a DVM?

You'll find the service manual here: Apple LED Cinema Display 24" Repair

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I have access to a DVM and was planning on testing the voltages as my next step. However, when reviewing the repair guide and other forum posts on here, I can't seem to locate where the GND (ground) test point is.

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@johnnyn - The best place is one of the six screws which hold the logic board.

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Hi guys

I've been wrestling with the same problem for years as my second monitor went down. I've scoured the internet for all the solutions, it wasn't until I came across a site selling complete screens at a reasonable price. (It was mispriced but their still honouring the deal). They flagged up something of compatibility with other mac's of the same size. Namely it's compatible with the A1225 iMac from 2007-09 the 24 inch.

I've had a look on ebay and these models have dodgy graphics cards so you might be able to get a screen that's still functional that fits the brief for a absolute song. I'll keep you informed as to how things go.

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