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Current version by: Dan ,

Text:

Have you tried replacing the LED driver board which is the power source for the LCD's backlight?
 
Here's the IFIXIT guide: [guide|1639|iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement].
 
=== Update ===
Further investigating has pointed to a high current load of the LED strip within the display which burns out the LED driver board. This also can create a momentary flicker effect going off every 30 or so seconds.
 
Sadly, both the display and the LED driver will need to be replaced to properly fix this.

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Original post by: Dan ,

Text:

Have you tried replacing the LED driver board which is the power source for the LCD's backlight?

Here's the IFIXIT guide: [guide|1639|iMac Intel 27" EMC 2309 and 2374 LED Driver Board Replacement].

Status:

open