Keyboard and trackpad not working after replacement of parts

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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Martijn Verhoeven @mbgverhoeven

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게시일: 2020년 11월 6일

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Keyboard and trackpad not working after replacement of parts

Hi,

I recently found an old MacBook from my GF that had to her knowledge ‘stopped working’. It went through some minor damage during a car accident but after worked fine for a year or so before stopping completely.

When I picked it up and connected it to the adapter it started up, booted and worked for a few hours. After disconnecting the power supply it closed down and it would not start back up again.

Because I noticed that the battery was very bad I ordered a new one. Also the trackpad glass was broken (but still worked) so ordered that as well.

With the repair I accedentily broke the speaker connector on the I/O board. After that it would not power up anymore. So I ordered a new one and replaced the IO board. After that the MacBook booted and got into the loginscreen.

But now, the trackpad and the keyboard are no longer working. An external mouse works just fine.

Any ideas on how to proceed?

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While you did replace the battery I'm wondering if it was defective from the get go. I fear the battery has swelled pressing on the cables underneath.

Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see 기존 질문에 이미지 추가하기

Dan 의 2020년 11월 6일

Ok, I will try and report back.

Martijn Verhoeven 의 2020년 11월 6일

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While you did replace the battery I'm wondering if it was defective from the get go. I fear the battery has swelled pressing on the cables underneath.

Let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see 기존 질문에 이미지 추가하기 — Dan

Zach @zpl 평판: 4.7k 8 12 3 · Answer 1 · 2020-11-09T13:54:32-07:00

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Zach @zpl

평판: 4.7k

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게시일: 2020년 11월 9일

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If neither the keyboard or the trackpad are working it’s generally a sign that the trackpad or the trackpad ribbon cable is damaged. Since you replaced the trackpad, I’m guessing the trackpad ribbon cable is the culprit. You can see the cable in step 6 of this guide. They are easy to damage, but fortunately they are fairly cheap and easy to replace. If you see any pockmarks or cuts when inspecting the cable this would reinforce this theory. Anyway, I hope this helps!

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MacBook Air 13" Early 2014

Keyboard and trackpad not working after replacement of parts

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