Hello everyone, I am somewhat new to board repair. I can diagnose and repair certain power / back light issues on macbooks, ipads, iphones etc. but am still learning how to use schematics and multi-meter to efficiently diagnose and repair less common problems.
I have this 820-3115 board here for example with no boot. Does have Green Light & Fan Spin (Gradually gets louder and louder until it sounds like an airplane).
This machines did receive light amount of water damage about a week before it started doing this.
* There is no visible corrosion, there are some red probe points around the board.
* I did notice that U3900 gets very hot.
* I checked certain power rails and they seemed to be normal.
* I have multiple known good boards for testing.
I am mostly wondering (based on these symptoms) where I should start and why.
Would be very grateful if someone going point me in the right direction - thank you!
I have this 820-3115 board here for example with no boot. Does have Green Light & Fan Spin (Gradually gets louder and louder until it sounds like an airplane).
This machines did receive light amount of water damage about a week before it started doing this.
* There is no visible corrosion, there are some red probe points around the board.
* I did notice that U3900 gets very hot.
* I checked certain power rails and they seemed to be normal.
* I have multiple known good boards for testing.
I am mostly wondering (based on these symptoms) where I should start and why.
Would be very grateful if someone going point me in the right direction - thank you!