Sure, no problem.
Sadly I didn't fix it, but I am almost certain that the board is not at fault.
It works, but I have no keyboard / trackpad... Also lid sensor doesn't work but I think this a separate issue.
Until I replace the trackpad and lid sensor with known good units, I can't be sure abut the logic board.

It is 820-03400-A.

The M3 Pro board (820-02918) is similar, but has quite a few differences. I wasn't able to help with it much......

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

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

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?

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...

Looking for schematics and/or boardview for a MacBook Pro M4 Pro 14'' A3401
Board number: 820-03400-A

Thanks!

I don't have it here as I am on vacation now. Try finding one online... there are multiple posts of people asking for unlock and providing their dumps. Just pick one that is bit older and run a patch on it, then write it to your chip and boot the pc. After that remember to restore the original dump back!...

Found solution, used another locked bios dump for T470 from the internet from 2018, applied patch on it and wrote it to my BIOS chip.
Then it did its magic.

After that, I rewrote the original BIOS and reset it to factory defaults.

And it worked!

I am guessing that the autopatcher does not work anymore on newest BIOS revisions as mine is version 1.79 from late 2024 - the latest one. But it did work on older ones, so the version from 2018 worked.

I did exactly the same on my T470 and it DID NOT WORK! I got the black screen and a musical melody played! I flashed the original BIOS back and now it is booting again but still LOCKED! What I need to change? I followed the instructions by the letter!