I've found some really odd things while testing the ATX & auxillary (26 pin signal) connector on an old Cisco motherboard and I've been getting continuity when touching say a 5V and 3.3v, or a yet unknown wires on the auxillary connector. I'll touch the probe to one wire and with the other probe touch each of the other wires and at times I'll get a short beep and when I check again immediately, it doesn't beep and checking 3-10 more times gives no continuity. Now if I come back and check a little later, I often get the same result on the first touch/check - and I'm certain I'm not accidentally touching the probes to each other.
It happens with a lot of wires, not just 1 or 2. It makes it really difficult to figure out the pinout for the power supply and controller board. I'm wondering if this is kind of normal when checking continuity b/c I think it's happened on other projects but I always brushed it off as personal mistake, but here I'm testing all female socket's and I know I'm not making mistakes.
The motherboard/PCB looks to be in perfect, near new shape and it's from 2004, and was in service for 5 years, so IDK any of that can cause shorts or something. Any ideas what is going on?
It happens with a lot of wires, not just 1 or 2. It makes it really difficult to figure out the pinout for the power supply and controller board. I'm wondering if this is kind of normal when checking continuity b/c I think it's happened on other projects but I always brushed it off as personal mistake, but here I'm testing all female socket's and I know I'm not making mistakes.
The motherboard/PCB looks to be in perfect, near new shape and it's from 2004, and was in service for 5 years, so IDK any of that can cause shorts or something. Any ideas what is going on?