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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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How to remove logic board residue on components

How do you remove the residue that is stuck on the logic board that covers the capacitors and other components on the logic board? I have tried using isopropyl alcohol and a tooth brush but the residue is quite hard. Are there any other chemicals or techniques i can use to make this easier?

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Why do you need to remove it?

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one of the capacitors needs replacing

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You mean the black epoxy?

Apple use that stuff for a reason, those things are impossible to dissolve using alcohol and toothbrush, you'll need something like a phone BGA heater and a scalpel.

For example this video.

https://www.youtube.com/watch?v=7KPovvMP...

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It's called underfill. Hot air station and a blade or sharp tweezers to scrape it off should do it. About 150 to 180 degrees. Go easy so you don't damage anything.

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