Keyboard and trackpad not working after replacement of parts

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MacBook Air 13インチ Early 2014

2014年4月のアップデートによりアップルの13インチMacBook Airはデュアルコアi5またはi7プロセッサーの更新とわずかなバッテリー性能の向上がされました。

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Martijn Verhoeven @mbgverhoeven

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投稿日: 2020年11月6日

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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 iFixitでの質問に画像を追加する方法

Dan さんによる2020年11月6日

Ok, I will try and report back.

Martijn Verhoeven さんによる2020年11月6日

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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 iFixitでの質問に画像を追加する方法 — Dan

Zach @zpl 評価: 4.5千 8 12 3 · Answer 1 · 2020-11-09T13:54:32-07:00

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Zach @zpl

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投稿日: 2020年11月9日

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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インチ Early 2014

Keyboard and trackpad not working after replacement of parts

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