Hi all! I'm new here, not really I've already read a lot here but now I've made myself an account to post something. (I will also post some MBP hardware solutions which already have helped me saving some Macbooks) I now got a really strange problem, I just picked up a water damaged MacBook pro A1278 i5 model, green light on charger and sometimes it would charge but it didn't turn on. I found a very little corrosion on the logic board, cleaned it in an Ultrasonic cleaner with special cleaning liquid for electronics and then wiped the logic board with 99% IPA. I managed to get it powering on once with a special bypass method (see picture) and then it was fully working no problems at all (northbridge chip was a little hot, but I think it is normal? it was too hot to touch, It is the A1278 model with heatsink on the northbridge chip). I get the 3.45V on G3hot, I already tried a new keyboard but still no lock. Now I have the green light on magsafe but it will not power on. Hope someone can help me to fix this unit.