In addition, they provide the wiring that eventually will connect to the bumps and the PCB. And many of the notions necessary for PCB manufacturing play out on an interposer, but in miniature. Entire ...

Old PCB’s that wasn’t replaceable, did get full on repair with epoxy, and components swaps, also new traces. It’s fun to repair 4 layer boards like that, wheb you have a gaping hole in the ...