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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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.
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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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Why do you need to remove it?
Duck 의
one of the capacitors needs replacing
Morgoth 의