820-01841 ( ? ) on boot device. Unable to read SSD

I have verified the power rails are present.
unit sill not recognize on board HD.

No shorts, no hot spots, All the SSD rails are normal.

My next option would be to pull NANDs and test.

Question before I start that. Can I replace these? Is there some magic apple drama preventing me from doing so? If I do replace them do I have to read and save some data first to be transferred to the replacement chips.
 

2informaticos

Administrator
Staff member
T2 firmware partition is on internal SSD.
You will need a DFU restore after that.

Apart of power rails, check SSD signals; as reset, clock.
Compare with good board, if possible.
 

2informaticos

Administrator
Staff member
I supposed you want to change some BAD (damaged) chips.
How to read them, if are bad?
If the chips are still good (readable), why need to change them?
 

2informaticos

Administrator
Staff member
I understand you have the tools to read these NANDs.
But you've asked about change them in a logic board.
If the chips are good, then why to replace them?
And if the chips are bad, I don't expect you can recover data...
 
Top