hello ,

so i have some PCBs , some that works , and some not .
when i thought with an idea , i connected each to the power supply and measured the DC voltage between each on the four motor pins , and i found that some givving between 4-7 volts , while other givving 1 or less volts , "two PCBs are idintical the first gave 4-7 volts and the other gave less than 1 volts"


i know this is much more complicated ,but can i consider this test a PCB primary test to dinstinguish between working and burned PCB " if no burn marks or smell in remarkable" ?
"not considering firmware problems and other PCB failures"

Multimeter is not good enough (pulsating voltages),
Try with an ossiloscope