iMac 5k backlight dead issue

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imacquestion

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Nov 29, 2016
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So I recently upgraded my late 2015 imac's processor from an i5 to an i7, and when i put it all back together, the screen would not turn on. Well technically it turns on but the backlight does not work. (I can see everything if i shine a strong light on the screen) I've reopened it a few times to try and see what the problem is, but I cannot find anything. The connections are good, the cables are good, nothing appears to be broken or out of the ordinary. Does anyone have a clue on what is messed up and what I would need to fix/replace? I don't want to go to the apple guys....

I believe there are 4 possibilities for the issue:
The power supply, the 2 display connections on the logic board, a fuse somewhere, or the GPU.

specs:
iMac (Retina 5K, 27-inch, Late 2015)
4 GHz Intel Core i7 6700k
16 GB 1600 MHz DDR3
AMD Radeon R9 M390 2048 MB
Crucial mx300 750gb 2.5'' SSD
 

imacquestion

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Joined
Nov 29, 2016
Messages
2
So i just looked at the diagnostic leds on the logic board and when i turn it on, the first 3 light up and the 4th doesnt. i read that indicates communication between the board and the display. so i think the backlight board is the issue. any thoughts on this?
 
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