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Hello, I have the MacBook pro early 2015 and the battery was dead after 4 years so I decided to order a new one and change it. So I removed the old dead battery. After checking that nothing was destroyed by me I ordered a new one. After some weeks without the battery, while I was using my MacBook I spilt a little bit water to my laptop. I immediately disconnect the MagSafe and my pc was off. After that, I blow with compressed air the keyboard to dry the keys. Subsequently, I took the motherboard and clean it with alcohol (I haven’t isopropyl alcohol). Today I noticed that the power button doesn’t work unless I disconnect the MagSafe, pressed it for 1-2 seconds, plug in the MagSafe and then press the power key. Any ideas?? Thanks in advance Update (03/26/2020) You can see how the power button behave ->https://youtu.be/uRdUsnvFl5o ->https://www.youtube.com/watch?v=VF0RxEDi…
May be try to closely look with a ‘lens’ or microscope for any short/damage to the DC in board. Or replace it. Careful: may be you can cause more damage by opening and analysing. At least it works now!!! MacBook Pro 13" Retina Display Early 2015 MagSafe DC-In Board Replacement
