Water damage - what to replace (logic board / IO-board)?
my sister spilled water/tea over her Macbook Air Early 2014 a while ago. It powered off immediately (electrical short?) and didn't turn on again. We let it dry for about 1 week and since then we see this behavior:
The MBA boots up as usual, but *only* after unplugging and re-plugging the battery connector inside the case, then connecting the (external) charger and then pressing the power button. After pressing the power button, the CPU fan spins and stops for 3 times (~1sec), and then it finally boots. When booted, the CPU fan runs on full speed most of the time and the laptop is *very* slow. Someone told me it might be that the laptop "thinks" it's too hot and puts itself into overtemp-safety-mode and that the logic board needs to be replaced. Other than that, all components (audio, screen, keyboard) seem to work fine.
I disassembled the MBA and some parts of the logic board look corroded and dirty from the liquid. I was about to order a new logic board and then saw that there is also a little I/O board next to the CPU fan.
- Do you think replacing the logic board fixes all issues?
- Do I need to replace the I/O board as well; or maybe only the I/O board?
- Can I perform any tests to see what exactly needs to be replaced?
- Are there different models of logic boards for the early 2014 that are not compatible? (I heard that some have a fan that is fixed to the CPU heatsink, and some have a removeable fan?)
- Can I only use early 2014 logic boards / I/O boards or also older/newer ones?
Thank you very much for any help!