magsafe charger is overheating and sometimes laptop does not charge.
The charging symbol sometimes has a white background with the electricity signal but it often does not charge the macbook.
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At this point you're going to need to pop the logic board out and do a detailed inspection on both sides. Follow this IFIXIT guide: MacBook Pro 13" Retina Display Mid 2014の基板の交換. I'm suspecting you have some corrosion or a failing chip on the logic board.
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Did you have a liquid spill or sit the system down on a wet surface at some point?
Dan さんによる