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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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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?!

Update (03/12/2018)

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.

:-(

Answer this question I have this problem too

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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

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Hi Stephen,

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

Regards

Eamonn

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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!

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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.

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

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Stephen will be eternally grateful.
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