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모델 A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 또는 3.8 GHz Core i5 또는 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K Display. 시스템이 매우 유사하므로 이전 iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 안내서를 참고하십시오.

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Display works and doesnt work

My iMac display goes black a lot but if you were to shine your phone light at the screen you can actually still see the stuff on the scree and changing the dim does nothing.

Somedays it works and other weeks the backlight wont come on. It originally started doing this after an update about a year ago. It would sometimes start up in safe mode for a bit and then go black again. It’s never been touched internally and pretty much barely used as it happened a few months after I bought it in 2018. Not sure what exactly is going on, but feel like it’s maybe a software issue as the backlight will work sometimes.

Update (01/01/2020)

It will reboot when I start up holding down Option key. But, then after a couple minutes the backlight just goes completely out.

It goes out no matter how I get it to power on. Then sometimes i’ll leave it on with no backlight and then hours later the backlight will go on. I’ve tried disc repair.

Everything I can think of and google and the backlight won’t stay on.

I got it to work about a month ago for a week straight with no issues and then it went back to having the backlight issue.

Can’t find much researching this issue as it doesn’t seem like a very known issue. Maybe at this point its best to take a it to a repair shop if it can even be fixed.

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Before you throw the towel in how about running the onboard diagnostics. Restart your system and press the D key

Reference: Mac startup key combinations

Did you get any error codes?

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If you don’t have an external USB dtrive, simply boot into Safe Mode by holding down the Shift key on startup to boot to a pure system. You can also boot to your Repair Partition by holding down the Option key on start up and selecting the repair partition. If it works, then you know you have a software issue.

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Thank you for the help. Much appreciated. It did boot up in partition but the question is how to fix the issue?

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There's a slight wrinkle here. When you use the repair partition it only uses the CPU's graphics engine Vs the dedicated AMD GPU chip. So its possible the GPU chip s failing.

Lets try running the onboard diagnostics to see if an error pops. Restart the system and this time press the D key or give the external drive a try.

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We're making progress. Did you run Disk Utilities when booted from the partition? Do you have a good "Paid For" anti-virus?

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Most backlight issues have been hardware related (sorry).

To disprove the software side you could create an external bootable drive which has a fresh OS install and them use it to boot your system. If the problem persists then you know its a hardware issue. Sorry you waited so long to look into your problem as it might have been covered by warranty (check your sales slip and if you live in a country with two year warranty you might still have a chance).

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