Chosen Solution
My MacBook Pro started smoking when plugged into the charger. The smoke was coming from the back, about 1.5 inches from the power connector on the bottom of the logic board. It looks like the brown component in the photo has exploded (right end black and charred). So what is that - a capacitor? what spec? I expect the local repair places will just want to replace the entire board.
That would be C3898 is a capacitor with the following specs: 4.7UF 1206 package X7R-CERM 50V voltage 10% tolerance All depends of the repair shop, if they have the equipment to remove and replace this. Not difficult.
i can see more than one caps with green corrosion signs, plz try replacing them too
