820-4924 Does not install any system.

[iClub]

Good afternoon, I have this mac that does not install any macOS, high Sierra, mojave, catalina system, none. In the apple's own test, connecting the machine holding D, says the following "one of the memories is defective". I would like to know which one of the 4 memories on the board is defective ?
Ahh is there a way to replace these memories by removing them from another board of the same model 820-4924 ?

 

[2informaticos]

You should try to reball them first.
Or replace them directly, if have donor board.