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Your first step is to remove your MacBooks main Logic Board, this process will very from model to model and the guides are readily available on iFixit. For this example we will be disassembling an A1502 MacBook Pro w/ Force Touch.
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Next, we are going to remove the heat sink and thermal paste. Again this step will very slightly from model to model but is important to ensure proper cleaning.
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Place the MLB on a lint free towel and begin to carefully remove any visible corrosion with a tooth brush and 99% Isopropyl alcohol. AT this point I would take pictures of the affected areas before cleaning so you have an idea of where to start diagnostics once the board has been cleaned.
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Placing the board in an ultrasonic bath for 15 minutes at 40c with some type of electronics safe detergent will ensure that corrosion that is not visible to the naked eye will be removed. Electricity is the catalyst for corrosion, even a small amount left untreated can come back to bite you. In my opinion a toothbrush and alcohol alone is risky.
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Place the logic board in a shallow bath of 99% alcohol for a few minutes to displace the water from the ultrasonic bath. Use canned air or and electric air gun to blow the board dry.
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If you have a stereo microscope you should go over the board to look for damaged components or broken solder joints. If no microscope is available this would be a good time to loosely reassemble the unit and see if you have a good result. If the unit has visible issues board level you may want to consider finding a professional repair option.
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Like we said in the beginning, getting the MLB up and running is likely one of several steps required to restore a MacBook after a liquid spill. We hope this guide was helpful, Good Luck.
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The new mbpro has the logic board completely attached to the case along with the battery. Would it be possible to put submerge the entire thing in ultrasonic bath? or is that just going to destroy it?
Similar question as the other 2 comments: I was wondering if this worked for the M1 14" 2021 laptops? I was concerned about the storage and stuff on the logic board itself and if the ultrasonic bath could ruin those? Also, do you know the dimensions of the logic board (part number 661-21276) itself and if 6L with a basket would an appropriate bath size? What temperature did you use in your bath? I assume the 40 is in regards to khz or was it celsius? Any suggestions on bath brand/model and detergent are also welcome!
