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What could be the issue? The first one works then stops, then works then stops, I noticed some corrosion on the board while replacing the trackpad, but it's very confusing. None of them seem to even affect the tb3 controller.
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You may need to replace the MacBook Pro (A1989, A1990, A2141, A2159, A2251, A2289, A2338 Mid 2018-2022) USB-C Board that will require lifting the logic board out to give you access to the screws which hold the port assembly as you can see here
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Wiped away the corrosion and it works now, but Dan's answer is the one that should work for basically everyone. <3 It seems like my problem was on the main board though, not the USB port board!
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How about posting some pics so we too can see the corrosion iFixitでの質問に画像を追加する方法
Dan さんによる
I wiped away the corrosion and it works fine now, haha! Quite interesting, there was corrosion shorting one of the very small chips on the board, almost looks like a tiny mosfet.
wkw030210 さんによる