I'm working on a project using a perf board. I just powered it up, I discovered that my 5V rail wasn't up. Quick poke around the board and I found that my 5V rail is shorted to ground, somewhere.
I only have a simple, mediumquality 3.5 digit DMM, and the smallest resistance range is 200 Ohm. So no matter which two points on my ground and 5V rail I pick, I measure 0.7 Ohm.
Do you guys have any tips on where to get started? I am gonna give it a second visual inspection after cleaning it like a madman to get all the flux off so I'm sure I don't miss something. I've also been tempted to find one of my old PC supplies and try just forcing a few amps through and see what smokes.
I could also try and make some kind of makeshift low resistance measurement thing (constant current source and a basic amplifier into my multimeter?)