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iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Built-in display mostly stays black but sometimes displays perfectly

Previously my iMac Built-in display randomly went black but once restarted, worked fine. Now mostly stays black except occasionally it displays perfectly at the startup but goes black in approx. 10-30 secs and sometimes it randomly displays perfectly for about 2-3 secs while I am using it.

I now use an external monitor and works perfectly fine.

Recently my local apple repair shop as part of diagnostic process, replaced the LCD panel with another working used LCD panel from Late 2009 model and it worked fine.

Does this mean that I should replace it with a used LCD panel as a best solution?

My LCD panel seems to work fine when it stays on but what could be the problem? Any suspected bad connection within LCD panel with this model?

Any help is much appreciated. Thank you!


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I'm a bit confused?? The original problem was fixed with a used display which worked. Time has pasted and the problem has happened again?

Are you sure you don't have the system going to sleep either by time or setting?

Putting Your Mac in Sleep Mode

How to Keep Your Mac From Sleeping- 5 Methods That Work

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I didn't proceed with getting the used LCD panel. My current LCD, though goes black, when it works for 10-30 secs, it seems to be displaying fine. So the problem seems to be related to the LCD panel, would it be any connection or component in this panel? The system is not set for sleep while I am using it with an external monitor. If I can't find a fix for my current LCD panel, then I have 2 options. 1. Replace it with a used LCD panel at my local repair shop, 2. Continue use the external monitor. Thank you.

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@andyswan Well it seems like you found the solution then. I doubt there is anything connection wise that would be bad that could be fixed without pulling the display panel apart and soldering, and not many places do that. My guess is that there is an issue with power to the backlight. When the screen is off you can try shinning a really bright light on it to see if there is an image, but there isn't an easy fix for that. I would go for the LCD replacement, since that fixed the issue for you.

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With the system turned on with the display now black, take a flashlight and press it against the display shining inwards at a sharp angle (15~20º from the surface) are you able to see the faint image of the display?

This series of iMac uses LED’s for the backlight system. Given your symptoms it could be either the Displays backlight unit (within the display) or the LED Driver Board.

As the system is winking in and out I’m leaning that your issue is really the LED Driver Board LED Driver Board Apple P/N 661-5311 and here’s the guide iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement

Using a volt meter (DVM) you should be able to diagnose which.

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Hi Dan, it started all normal this morning, I then re-started and manage to complete Apple Hardware Test (Not extended one) while the display was working perfectly and result = no troubles found, then within 2 secs of completing the AHT, the display went black. I used a very bright flashlight and press it against the display shining inwards at a sharp angle (15~20º from the surface) and not able to see any faint image of the display. It is completely black but the rest of the system is running fine.

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Andy zal eeuwig dankbaar zijn.
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