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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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iMac backlight only on lowest setting (LCD panel or Inverter defect?

hey guys, I have an iMac 2011 27 inch. The problem with this iMac is that the backlight only works on the lowest setting. If I increase the brightness the screen will go black, but the desktop is working because I can see it using a flashlight. The icons and desktop is visible with a flashlight.

GPU is probably working. Using an external monitor does not have this issue.

Diagnostic LEDs 1,2,3,4 are on.

Do you guys think it is the inverter or the actual LCD backlight itself ? thanks

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Apple Part # 661-5980A

https://www.dvwarehouse.com/661-5980-App...

$24.95

iMac Intel 27" EMC 2429 LED Driver Board Replacement

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Hello Mayer, I forgot to mention that I fully disassembled the LED panel and there were some bad LEDs in the backlight itself. I tested all LEDs with a multimeter in diode mode and some didn’t even light up.

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