Chosen Solution
A cup of water spilled on the my MacBook Pros keyboard, now the backlight is no longer working. How can I repaired it?
If you haven’t already, clean up any of the water externally and you’ll need to disconnect the battery so no further damage happens. Don’t turn your system on or charge it! these will also cause more damage until you have cleaned out any remaining water and corrosion. Time is the essence here! You don’t want the system sit wet and that will damage things as well. Keep the system cool to slow down the galvanic corrosion. Update (05/15/2015) Follow this IFIXIT guide to take your system apart: MacBook Pro 15" Unibody Mid 2012 Logic Board Replacement At least get to Step 4 disconnecting the battery. Then using a cotton swab with some distilled water carefully clean up any staining then go over the spots again with a high grade of Isopropyl alcohol (85% or better) to help in drying things out. Take a picture of any damaged and post it here for us to see. Don’t forget you’ll need to do both sides of the logic board.
