Chosen Solution
My GF’s sister spilled a smoothie down the back of her macbook, so I am attempting to diagnose the situation for her. It appears that some of the liquid made its way through the vents and pooled right under this spot on the logic board. It didn’t short out immediately. She was able to turn it off on her own, but after letting it drain and dry, it wouldn’t power on. The MagSafe also shows no lights when plugged in. There’s no sign of damage anywhere other than this spot, but is this enough damage to fry the whole board? Photo of damaged area:
https://www.dropbox.com/sh/pj9slcwunjw1o…
https://www.dropbox.com/sh/pj9slcwunjw1o…
Scott McKinnon, okay, so that is around connector J5100 that is Apple’s test connector for debugging the logic board. The real issue here would be the circuitry around U6100 which is your MX25L3205DM2I CMOS SERIAL FLASH (datasheet available right here) and all of this is part of your SPI ROM circuitry. Start of by checking the power fuse F6905 coming from your MagSafe DC power jack J6900 (right next to it), also check the DC in board for any damage and check the power on the connector. It is on the underside of the board. I suggest to clean the board and then re-evaluate. See what you get from that.
This is very likely fried. Look for corrosion on the other side, but just a small amount of liquid can fry a logic board because if just one connection is rerouted by the liquid, it can go into certain inputs that can’t handle that much power.
