Keyboard and Trackpad only work in Diagnostic mode

Question

MacBook Air 13" Early 2014

Apple의 MacBook Air 13" 2014년 4월 업데이트에는 참신한 듀얼-코어 i5 및 i7 프로세서와 더불어 배터리 성능을 약간 향상시켰습니다.

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Aaron @macstainless

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게시일: 2021년 4월 8일

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Keyboard and Trackpad only work in Diagnostic mode

After liquid damage to the MacBook Air, I’ve been able to get it nearly operational with a lot of cleaning w/ isopropyl alcohol & contact cleaner. However, I cannot get the trackpad or keyboard to work. I replaced the ribbon cable with one from iFixIt and now the trackpad & keyboard only work in Diagnostic mode.

Weirdly enough, the caps lock light is always on and remains on if I boot into macOS or Recovery mode. If I hold D when booting, I can get into diagnostic mode & can press caps lock to turn the light off. The trackpad functions in this mode.

I’ve reset PRAM and SMC multiple times. Any help on this would be greatly appreciated. Thanks.

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What is the errors (if any) you got in diagnostics?

Dan 의 2021년 4월 8일

@danj No errors at all since cleaning the entire logic board w/ isopropyl.

Aaron 의 2021년 4월 9일

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Dan @danj

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You likely need a new Trackpad and/or the trackpad cable.

This series uses the Trackpad to carry the keyboards signals to the logic board via the combo cable.

상품

MacBook Air 13" (Mid 2013-2017) Trackpad Cable

$14.99

상품

MacBook Air 13" (Mid 2013-2017) Trackpad

$49.99

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But then why would the trackpad work fine in Diagnostic mode? If this was a hardware failure, the trackpad and keyboard wouldn't work at all.

Aaron 의 2021년 4월 9일

The trackpad is the junction of the two signals which then go to the logic board. I often find liquid gets to the connector area damaging it or the circuity on it gets damaged. Time to replace both!

Dan 의 2021년 4월 9일

@macstainless - So what was it the cable or the trackpad?

Dan 의 2021년 4월 21일

Was both. I have no idea why it would only work in Diagnostic mode but swapping both out got it up and running. Thanks for the input!

Aaron 의 2021년 4월 21일

Oh, this sucks.

I had just posted on another Ifixit post that I too was seeing the KB/Trackpad work in diagnostic mode and was optimistic it was not a HW issue and was next going to try an OS install.

At almost $100 to fix this with replacement parts, it seems another used Macbook would be more cost effective.

Especially since the 128GB storage is getting hard to maintain anymore.

Knowing me I'm still going to try the OS re-install on a separate disk, I'm a sucker for punishment that way.

MWonder 의 2023년 5월 24일

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@danj No errors at all since cleaning the entire logic board w/ isopropyl. — Aaron
But then why would the trackpad work fine in Diagnostic mode? If this was a hardware failure, the trackpad and keyboard wouldn't work at all. — Aaron
The trackpad is the junction of the two signals which then go to the logic board. I often find liquid gets to the connector area damaging it or the circuity on it gets damaged. Time to replace both! — Dan
Was both. I have no idea why it would only work in Diagnostic mode but swapping both out got it up and running. Thanks for the input! — Aaron
Oh, this sucks.

I had just posted on another Ifixit post that I too was seeing the KB/Trackpad work in diagnostic mode and was optimistic it was not a HW issue and was next going to try an OS install.

At almost $100 to fix this with replacement parts, it seems another used Macbook would be more cost effective.

Especially since the 128GB storage is getting hard to maintain anymore.

Knowing me I'm still going to try the OS re-install on a separate disk, I'm a sucker for punishment that way. — MWonder

MacBook Air 13" Early 2014

Keyboard and Trackpad only work in Diagnostic mode

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MacBook Air 13" (Mid 2013-2017) Trackpad Cable

MacBook Air 13" (Mid 2013-2017) Trackpad

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