lower right part of the screen becoming darker

Question

iMac Intel 27インチ EMC 2309/2374

iMac Intel 27インチ EMC 2309 (Late 2009, Core 2 Duo 3.06もしくは3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHzもしくは Core i7 2.8 GHz) ID iMac11,1

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Jo Lejeune @jolejeune

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投稿日: 2020年12月5日

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lower right part of the screen becoming darker

I own a late 2009 iMac Intel 27" EMC 2374.

Since a few months now, the right lower part of the screen turns to be darker than the left side of the display (see picture).

Is this issue a backlight and/or inverter one ?

Many thanks in advance for advices and pointers.

Jo Lejeune

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Dan @danj

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投稿日: 2020年12月5日

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Ouch! The LED backlight circuit has a problem! This could be the 27” iMac 27" LED Backlight Board Where one of the channels failed. It could be the cable to the display assembly, or it could be the LED backlight bar within the display assembly its self.

You’ll need to use a multimeter to check the resistance of the backlight cable. I often find the connector on the LED strip breaks down from heat

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Thanks Dan for your quick reply.

Replacing the backlight board should be the better and easiest option for me.

(replacing the display assembly would be a too expense option!)

My iMac being the 2374 model (core i5), I'm assuming that this doesn't make any difference with a backlight board for model 2309.

Furthermore, is it easy to find and replace the cable to the display assembly ?

Many thanks once for the help.

Jo Lejeune さんによる2020年12月5日

I would test the LED Backlight Board before I would replace it. As well as check continuity of the LED Backlight strip.

Dan さんによる2020年12月5日

Dan, I'm not sure to properly acknowledge how to test the LED backlight board. Would you mean checking the board to detect damaged caps or circuitry ?

Sorry for the naive question, but I'm not too familiar with this ...

Jo Lejeune さんによる2020年12月7日

@jolejeune - Sorry

Dan さんによる2020年12月7日

Dan,

I apologize for being so long before reporting the next step of my issue.

I managed to get hand on a second hand LED Backlight board, and, after replacing it (thanks to the following iFixit tutorial : https://fr.ifixit.com/Tutoriel/iMac+Inte...) this fixed my issue !

Many thanks once more for your help !

Greetings from Belgium.

Jo Lejeune さんによる2021年1月18日

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Thanks Dan for your quick reply.

Replacing the backlight board should be the better and easiest option for me.

(replacing the display assembly would be a too expense option!)

My iMac being the 2374 model (core i5), I'm assuming that this doesn't make any difference with a backlight board for model 2309.

Furthermore, is it easy to find and replace the cable to the display assembly ?

Many thanks once for the help. — Jo Lejeune
I would test the LED Backlight Board before I would replace it. As well as check continuity of the LED Backlight strip. — Dan
Dan, I'm not sure to properly acknowledge how to test the LED backlight board. Would you mean checking the board to detect damaged caps or circuitry ?

Sorry for the naive question, but I'm not too familiar with this ... — Jo Lejeune
Dan,

I apologize for being so long before reporting the next step of my issue.

I managed to get hand on a second hand LED Backlight board, and, after replacing it (thanks to the following iFixit tutorial : https://fr.ifixit.com/Tutoriel/iMac+Inte...) this fixed my issue !

Many thanks once more for your help !

Greetings from Belgium. — Jo Lejeune

iMac Intel 27インチ EMC 2309/2374

lower right part of the screen becoming darker

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Update (12/07/2020)

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