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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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What is this area of the board for, it has corroded after hot cocoa

This is the top half left corner of logic board it has corroded but I am not sure what needs replacing

I removed some corrosion with tweezers but it looks like it is too late for some parts

Catastrophic

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This is it zoomed out the corroded part is the top left corner

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I tried searching up the hidden hub of schematics but I can’t understand them at all

Before I removed most of the corrosion with bare tweezers it was looking like the gunk you find under your toenails

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Oversong Name the proper way of dealing with this catastrophe is by first cleaning the board. Remove it and use some high percentage (96%+)isopropyl alcohol and a soft brush. You can submerge the board and gently scrub the board until clean. Then post some more picture so we can try and help you to identify the components. As well as checking them for damage. You will need at least a multimeter and some decent soldering tools (rework station, solder flux, microscope etc) and of course, knowledge about soldering. Soldering very small components on a logic board is trickier than to identify the components.

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