Water damaged MacBook Air A1932 AmrestoreErrorDomin Error-9 trying to restore with configurator

[dbuergi]

Hi all,

this Macbook was stuck at 5v and didn't start because of some water damage. I was able to clean everything and the board started. So i put everything back together and the Macbook seems to boot with 20v, 1,4A and 29W. So i decided a DFU recovery. At 50% of the system repair i get the error massage from the title. Display stays black and no Apple logo. Both repair and recovery don't work.
Is there anything i can do?

[dbuergi]

One thing i found is a problem with the audio board. I have to give the connector a better cleaning tomorrow.
So i diaconnected it and the MacBook started into recovery when i started Apple Configurator on my other mac.
But again installation failed around 40%.
Strangely the A1932 looses connection at this point and voltage changes as shown in the pic. After this the error message shows up.
So do i have to look for shorts again or any failing chip?

[dbuergi]

So i cleaned the board again under the microscope and reworked some solder joints which looked corroded. One big problem was the connector for the audioboard which was heavyly corroded and took some more time. The Macbook entered recovery mode and i was able to start a repair. It's starting now and my last and final problems is the cursor which is moving on its own.
Just a general question do i have to enter more specific details to get help? I'm not a pro so often it is reading, watching videos and sometimes asking stupid questions to learn something.

[mon2]

Disconnect the trackpad to see if the cursor movement stops. Removing the trackpad will cause the required embedded sensor communication to be lost. This in turn will cause a high fan spin and will throttle the cpu speed but check if the cursor movement halts.

[dbuergi]

I tried it and the Macbook worked normal for some minutes. Then it went back to slow self moving cursor and also the keyboard is not reacting to anything. Can this be a fault on the board or do i have to take a closer look at the trackpad?
Cables and connectors look fine.

[dbuergi]

Okay, too late to edit my former post. I had one small spot a the trackpad which i cleaned and now it's working fine but the keyboard is still without any reaction. The strange thing about this is that i used it to put the Mac into DFU mode yesterday and into restore today.
Only thing i did was cleaning the connector and checking the cable for any damages.

[mon2]

Review the cabling on the trackpad and the keyboard. For the keyboard flex, be sure it is inserted deep enough into the mating connector. Often the horizontal silk screened bar can be used a guide for the alignment. Perhaps you can post a clear pic of the connector for the keyboard and keyboard flex.

[dbuergi]

Sure, here are the pics.

[mon2]

To me - appears that perhaps the one connector flex can be pushed in a bit more? Be gentle but can you attempt it?

You will have to use 2 fingers to gently lift up the locking blade / bar and then push further into the connector. If there is resistance, stop.

Also, concerned about the dark spot on the flex - is that flux or something else?

[dbuergi]

The spot was only some dirt and the i`m not able to push it any deeper. Tried it for several times now and the next step would be force but i don't think that it would help.
But problems with the trackpad seem to be solved after taking out the board connector and cleaning again.
One more thing i saw is the non working lid sensor which is causing problems so maybe i will replace the speaker and get a new keyboard / trackpad cable since they are not expensive.

[dbuergi]

I changed the cable and speaker with lid sensor and the MacBook came back to live and i was able to get into Internet recovery before it started to go crazy again. After rebooting voltage went to 20v i got a fan spin and A and W dropped to 0. I waited some time, tried again and it started to the flasing folder Icon. But this should be normal since i didnt reinstall the system.
So now i think i have to find a temporary? short on the board or a chip which is acting strange. Maybe any ideas where to start or is measuring any option here?

[dbuergi]

Water damage is a b.... I took my pick and inspected the whole board again and found three parts with corosion under the solder joints but all only had it on one side.
MacBook is running now but i got two more problems. The lid sensor is not working and since i installed a new speaker and audio board it must be something at the logicboard and the MacBook seems slow.