I'm trying to get a circuit to work (linistepper driver) and I suspect I may have fried the drive transistors (tip122's in this case).
Are there common behaviors of broken transistors?
does c->e short? b->e? open?
Can I measure with my multimeter to get any meaningful information?
is it possible for devices to half break with degraded performance?
I'm looking for generalities. I also have an old stereo which has a broken channel.
I'm not particularly good at desoldering, so it'd be good to have some confidence that I'm looking at the right component.