This PTH-via corroded open likely because the top part of the via was not plugged by the solder mask and activated solder flux was entrapped in the via.
Check out SEM Lab, Inc. to learn more.
This PTH-via corroded open likely because the top part of the via was not plugged by the solder mask and activated solder flux was entrapped in the via.
Check out SEM Lab, Inc. to learn more.