Chosen Solution
To give some backstory on this MacBook Air had water spilled on it, the person who spilled the water had put the laptop in a tent position waited for probably an hour then tried to attach the MagSafe cable and power on repeatedly. After no success he gave up, and I offered to attempt to fix it for him. There was minor corrosion in multiple spots of both the logic and I/O board as well as the CPU heatsink thing. I remove all those parts and put them in a ultrasonic cleaner with distilled water and 5% elma tec S1 solution at 62 degrees Celsius for 2 minutes. It appears that had removed the corrosion, inspected the logic board closely for any signs of discoloration/damaged pins and it looked good to me (also reapplied thermal compound to attach the heatsink). I then checked the I/O board and where there was previously corrosion I saw there was a somewhat burnt discoloration on the board itself. After the ultrasonic cleaning I used a Multimeter on it to check connectivity throughout the board (I honestly didn’t have much of an idea what I was doing with the multimeter in terms of understand what I was suppose to interpret). I will post some images of what the I/O board in question looks like and possible a pic of the logic board itself, thanks for the help in advance.
Well I think the first step is replacing the MacBook Air 11" (Mid 2013-Early 2015) I/O Board and with the battery not connected you should get the MagSafe connector Amber LED. If not then your logic board needs work. If you get an Amber LED then the next step is seeing if the system starts up if it does then than only leaves the battery which may need replacing, you’ll need to install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question so we can see what battery tells us. Its likely you’ll need a new battery as well, just based on the systems age. If the logic board fails the startup you’ll need to try the power pads to see if the power switch in the keyboard is having problems. If the power pad works then the keyboard will need replacing. And if it doesn’t work then the logic board is in trouble.
