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

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Black display on iMac but external display works

My iMac's display functions normal through boot up but then goes black anywhere from 10 seconds up to a minute or so after fully loaded. It works perfectly fine on a external display. Often when I leave my computer to sleep and come back to it, it will once again come back on for a short amount of time.

This started gradually probably 6 months ago. It would go black after using it for an hour or so and over time would go black quicker and quicker.

I brought it to Apple and they determined it was a backlit issue, which they replaced. It worked for maybe a week before it started happening again.

Any help would be very, very appreciated! Thank you for your time in advance.

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Can you discern the desktop using a flashlight held at an angle to the screen?

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I can, but just barely.

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As long as can see the screen, the GPU is good and so it the LCD. Replace the driver board: iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement

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Thanks for your quick response.

I brought it to Apple a few months back and they replaced the backlight board already.

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Contact them and ask for a warranty exception. Frankly, since Apple considers this a "Legacy Machine", since it is over 6 years old, I'm very surprised they worked on it at all.

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It's a shame because beyond the display it really works fantastic.

Thanks very much I really appreciate your help.

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JJ will be eternally grateful.
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