Brightness of screen won't change (won't get brighter)

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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Stephen @viejasbotas

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Postado: 12 de mar de 2018

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Brightness of screen won't change (won't get brighter)

I've just bought a late 2015 iMac 5k (used, sadly!), and there seems to be a problem with the brightness. I noticed fairly quickly that the screen isn't as bright as either my Macbook Air or the Thunderbolt display I was using previously. The brightness control only makes any difference for the first five "blocks", after that any increase makes no difference. I am running 10.13.3. Here are all the things I've tried so far:

Turning off auto-brightness (makes no difference). Night Shift is also off.
Resetting the PRAM
Resetting the SMC
Turning it off and on again!
Running diagnostics (no issues found).

Nothing has made any difference.

The screen is equally bright across all of it - no dark corners / sides.

Can anyone help me work out what's going on?!

Other stuff I've tried:

- hooking up the thunderbolt display - mac controls display brightness no problem, and it's much brighter than the iMac display

- downgrading to 10.11.6 - same issue.

:-(

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i have the same issue with my iMac late 2013 after i installed the new High Sierra the device display played funny and brightness adjustment is not working.....still looking for an answer

8 de jun de 2018 por halfraid

Hi Stephen,

I have exactly the same issue - second hand 5K Imac (2017). Did you ever resolve?

Regards

Eamonn

26 de nov de 2018 por Eamon

The worst part about it,,,,Apple dont say anything, i just lost my iMac pretty much because it wont function like how it used to…and it is NOT CHEAP!

27 de nov de 2018 por halfraid

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i have the same issue with my iMac late 2013 after i installed the new High Sierra the device display played funny and brightness adjustment is not working.....still looking for an answer — halfraid
Hi Stephen,

I have exactly the same issue - second hand 5K Imac (2017). Did you ever resolve?

Regards

Eamonn — Eamon
The worst part about it,,,,Apple dont say anything, i just lost my iMac pretty much because it wont function like how it used to…and it is NOT CHEAP! — halfraid

Dan @danj Rep: 479,1 mil Self employed contract worker 35 329 971 · Answer 1 · 2018-03-12T05:48:00-07:00

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Dan @danj

Rep: 479,1 mil

Self employed contract worker

35

329

971

Postado: 12 de mar de 2018

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I think the best solution here is to bring it into an Apple Store and let them figure it out.

I haven't seen any of the newer 5k models have issue with a weak backlight as you've described.

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My brightness won't work from the keyboard. I have to change it in preferences. The meter goes up and down but no change in the screen. I have a 2017 macbook pro that I bought last summer and have already had to have the keyboard replaces for other issues. For what we pay for mac they should be flawless- at least for the first couple of years.

3 de set de 2019 por Samantha Birtwell

Samantha - iMac's are different than MacBook Pro's

3 de set de 2019 por Dan

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

Brightness of screen won't change (won't get brighter)

Update (03/12/2018)

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