Yeah i have one left.
And they are thinking to upgrade to a latest versions or swap to similiar motherboards if there are any available in internet.
But i guess there isnt any.
Their stuff, their call.
If you get other boards back one day consider doing comparable diagnose for all of them.
And stay in repair more, that's what is expected from you.
Maybe you were lucky with earlier boards and now you got a real problem.
It can distort an outsider's understanding of the situation.
You're still sort of prototyping.
If your project is to figure out the circuit and its function the situation is different.
But then you must make clear that reverse engineering will take time and at some point, despite the project status, it is not relevant anymore.
Using this kind of a messaging system as a guiding source can also be very problematic.
First of all it is slow, so slowing your already slow process even more.
Then the quality of guiding is completely unknown first, and later based on your assumptions and expectations, right or wrong.
Bright side is that you can get much wider information base than from face to face stuff.
One other thing, take your time, the forum is not going anywhere.
But try to answer all direct and relevant questions and ask more if you don't understand, it can be problematic if you're too far behind, but it must be solved or the process will stop.
During this thing you've said that you may have missed some messages.
You can only remember what you can remember, if you're getting too much info you can expand the forum.
There you split the single column of the forum to multiple "columns" of your own notes.
Different portions of circuit or function for a "column" is one possibility.
Your goal is still repair those boards, missing relevant information doesn't help that.