MacBook Pro M4 Pro - no keyboard / trackpad / lid sensor

[mitchw]

Hello
I got this MacBook Pro M4 Pro to have a look at.
It was tiny bit liquid damaged, just the edge of the board got 1 small 10x10 mm area wet. I've seen much worse that still worked fine to be honest.
Since it was liquid damaged, warranty does not apply anymore.

Anyways it was checked at an local Apple Store and they discovered that it needs new trackpad, new top case, etc. Also it needed a new lid angle sensor which they replaced.
The main issue was that the screen remained black.

Anyways I cleaned the liquid damaged area, put the machine back together and I noticed this:
- Internal keyboard not working. However I can turn on the machine with pressing any of the keys.
- Trackpad also dead
- Machine will not sleep / turn off LCD, when lid is closed

So now I am thinking the whole issue might be just with the Lid Angle Sensor which they replaced at an Apple Store but they might forgot to calibrate.
Or there might also be an issue with the trackpad which I discovered was sitting bit uneven, and when I took it off, 3 out of 4 metal shims were missing! One of them was lodged beneath one of the trackpad springs. I am guessing the technician removed this trackpad to check for the liquid damage, and since there was none, he just put it back, but lost the shims.
Or perhaps this is indeed a Logic Board issue. Sadly I can't find the schematics for it. I compared it to the M3 MBP14 board, but they are quite different.

[mon2]

Review this:

https://www.youtube.com/watch?v=u18D...hannel=AhaTron

[mitchw]

Thanks. I checked it out. On their machine the sensor is working, but not at the right angle.
Mine is completely dead, it does not register opening/closing it no matter the angle.

Which is weird as it was just replaced. I could try moving the magnet by 180 degrees, but I am thinking that the lid sensor is not even initialized (programmed). I read somewhere that new Lid Angle Sensor needs to be initialized, otherwise it will not work at all.

What about the non-working trackpad / keyboard?
I guess I should replace the trackpad first?

[mitchw]

Also forgot to add, but running the diagnostics throw following errors:
NDR008 NDK001

[mon2]

https://discussions.apple.com/thread...06?sortBy=rank

check your keyboard cable.

[mitchw]

https://discussions.apple.com/thread...06?sortBy=rank

check your keyboard cable.

Ok!
I checked. Keyboard and trackpad cables are both fine.