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[SOLVED]820-3437 Early 2014 weird behavior

XooP

XooP

New member
Got this MacBook Air 2014 today. It is slightly water damaged, I can see some corrosion around U5450 (replaced this) and at the trackpad cable (cleaned this one).
It turns on when connecting the charger, the fan spins high all the time. It only has green light some of the time, it does not see battery. I have tried with a new IO board and signal cable.
When trying to install macOS it stops telling me it cannot install if not connected to a power outlet, which of course it is.
I will not turn off while holding down the power button.
I have tried the board with a new keyboard and new trackpad. Both the old and the new keyboard/trackpad combination seems to work fine in macOS.

As far as I can tell there is no ASD for this board, or can I use ASD for the 2013 model since it has the same logic board?
 
D

dukefawks

Administrator
Power button issue and fan runs high because of bad trackpad cable and or connector on the board.
If there is no green light it is probably bad IO board/cable/connector on the board, inspect for corroded pins.
Battery issue can be battery/SMC/ISL6259
ASD is 3S156.
 
XooP

XooP

New member
Thank you,
There is no corrosion on the IO board connectors, and I have already tried a new IO board and cable.
 
D

dukefawks

Administrator
No green light also happens when the power button hangs. So it could be corrosion on trackpad/cable/connector/bad keyboard. This would also explain the battery not recognized and the fan on high.
Measure SMC_ONOFF
 
XooP

XooP

New member
A small breakthrough, i saw one corroded pin at the diagnostics port, so I removed it. Sorry I did't notice sooner. Now it has orange/green light an no high fan spin :)
 
XooP

XooP

New member
It's very unstable, one minute it works fine and the next the fan blows like crazy and SMC_ONOFF turns low again :(
 
XooP

XooP

New member
Just an update here, cleaned the board and the trackpad cable and after that the fan started acting normal and keyboard functions as it should.
Battery wouldn't charge before I did an SMC reset. Everything is fine now.
 
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