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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Screen brightness not changing

I recently noticed that the screen brightness on my iMac 27” 2017 model not changing, in precise, from the darkest to 30% brightness bar, it can change, but after that, it just keep the same brightness even though the brightness bar can be increased. When I do reboot, and before screen turns bright, I can see some white spots light up from bottom edge of screen, which looks different from what shows on the top edge. Running Apple self hardware test, it didn’t report any issue. So, what could be wrong, screen backlight, inverter, etc.?

Thanks in advance!

Shaun

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@mayer Calling Dr. House of Macs, do you have an idea of what could be the problem?

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The newer iMac’s use a Buck driver which does allow a finer level of brightness. I’m suspecting the control logic is having issues with it’s stepping. You also talk about white spots of light that is either light leakage or your display has an issue.

Has someone opened your system? Have you has it serviced at some point?

Given its such a new system you likely still have warranty coverage. I would take it to an Apple Store or authorized service center to have it looked at.

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Apple will surely service your system if it is under warranty and you or someone else has not opened up your iMac. That might be your best bet if you under those circumstances.

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Is control logic a hardware component or a software program? Thanks, I will bring it to Apple store there.

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Its hardware!

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Hi,

It seems to be a backlight issue based on my experience with iMac’s. I know @danj know a lot about iMacs.

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