Screen brightness not changing

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iMac Intel 27インチ Retina 5Kディスプレイ (Mid 2017)

モデル番号A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5もしくは3.8 GHz Core i5もしくは4.2 GHz Core i7 Kaby Lakeプロセッサ (ID iMac18,3) / Retina 5Kディスプレイ。システムは類似しているため、修理ガイドについては旧モデルのiMac Intel 27インチ Retina 5Kディスプレイ (Late 2014 & 2015) を参照してください。

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Shaun @cxz

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投稿日: 2018年10月10日

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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?

[deleted] さんによる2018年10月10日

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Dan @danj

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投稿日: 2018年10月10日

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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.

[deleted] さんによる2018年10月10日

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

Shaun さんによる2018年10月10日

Its hardware!

Dan さんによる2018年10月10日

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@mayer Calling Dr. House of Macs, do you have an idea of what could be the problem? — [deleted]
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. — [deleted]
Is control logic a hardware component or a software program? Thanks, I will bring it to Apple store there. — Shaun

Niels @nixni 評価: 1千 12 6 · Answer 1 · 2018-10-10T02:18:37-07:00

Niels @nixni

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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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iMac Intel 27インチ Retina 5Kディスプレイ (Mid 2017)

Screen brightness not changing

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