Keyboard and Trackpad unresponsive, liquid damage on logic board

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MacBook Air 11インチ Mid 2012

1.7GHz デュアルコア Intel Core i5（Turbo Boost使用時最大2.6 GHz）3MB L3キャッシュ

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Faisal Gondal @faisalgondal

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投稿日: 2020年1月11日

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Keyboard and Trackpad unresponsive, liquid damage on logic board

I bought a MacBook air with unresponsive keyboard and Trackpad. I was told it had not suffered liquid damage, so I thought it'd probably be a case of replacing keyboard and or Trackpad with ribbon, but off course when I opened it up, I noticed there were some liquid damage marks underneath the logic board.

I cleaned this out with isopropyl alcohol and left it to dry. I can't see any resistors etc missing off the board. Connectors also look ok visibly. Put it back together and still the same issue.

I know the issue is on the logic board as I've tried another board from a similar MacBook and keyboard and Trackpad came to life.

I'm looking for some advice as to where exactly on the logic board should I be looking for any particular issue relating to the Trackpad/keyboard please?

Picture of cleaned up logic board is attached.

Thanks

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Can anyone help?

Faisal Gondal さんによる2020年1月14日

What is the board model number?

Tim さんによる2020年1月17日

Hi

It's 820-3208 A

Faisal Gondal さんによる2020年1月17日

@optimizelogic are you able to assist with this logic board issue? Thanks

Faisal Gondal さんによる2020年1月18日

Before you cleaned the board, did you notice any corrosion anywhere?

Tim さんによる2020年1月19日

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@optimizelogic are you able to assist with this logic board issue? Thanks — Faisal Gondal
Before you cleaned the board, did you notice any corrosion anywhere? — Tim

Ravi @me_ravi 評価: 217 3 2 · Answer 1 · 2020-01-18T01:08:25-07:00

Ravi @me_ravi

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投稿日: 2020年1月18日

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Agreeing that you have expertise in hardware swapping and also assuming software expertise, reinstall all the parts and perform the clean install of the MacBook using a USB keyboard and mouse and perform clean OS X install as it might suffered kernel panic or kernel extension problem. Before reinstalling clean the connectors of the trackpad and keyboard in the logic board with ipa. All the best

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Ravi - how is reinstalling all of parts back together going to fix a hardware fault? All connectors have been cleaned and I've put it back into machine and have also tried a new SSD with OS installed prior to posting the question.

Clearly it's a hardware fault with the logic board but I am trying to identify what I need to check on the board to fix the issue.

By the way I've just done that again anyway, put it all together and reinstalled MacOS, as expected not had any impact.

Faisal Gondal さんによる2020年1月18日

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MacBook Air 11インチ Mid 2012

Keyboard and Trackpad unresponsive, liquid damage on logic board

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