General Possibly dumb question....
Hey, I have just been testing some power supplies given to me and noticed something odd. I am using an older Power Judge as a basic first check. I am getting overvoltage on reading on all three newer power supplies that are missing the old -5v wire. Is the lack of this line triggering a false reading? The others are older supplies with the -5V line and all test fine. I took an older one with -5V which I knew was bad. I got the expected overvoltage. I dug out and looked at two others I had tested earlier and had given overvoltage warnings, you guessed it, both are minus -5V.
It just doesn't seem I could have five bad supplies that all happen to be minus the -5V line. You guys know more on the inner workings and theories, I'm just a solder monkey. What do you think?
Bill
Supplies w/o -5V, giving overvoltage warning:
Dell L280P-01 24pin
Ultra ULT-XF700s (CyberPower OEM) 20/24pin
Bestec ATX1956D 24pin
Hercules 450W 20pin
Hercules 480W 20/24pin
Bad WITH -5V showing overvoltage:
Antec SL300S 20pin
It just doesn't seem I could have five bad supplies that all happen to be minus the -5V line. You guys know more on the inner workings and theories, I'm just a solder monkey. What do you think?
Bill
Supplies w/o -5V, giving overvoltage warning:
Dell L280P-01 24pin
Ultra ULT-XF700s (CyberPower OEM) 20/24pin
Bestec ATX1956D 24pin
Hercules 450W 20pin
Hercules 480W 20/24pin
Bad WITH -5V showing overvoltage:
Antec SL300S 20pin
Solved it myself. Answer is YES. Older Power Judge testers misread if there is no -5V wire present. I tested with a couple of junk supplies. Green across the board on the Power Judge I was using. I then clipped the wire to simulate the missing pin in newer supplies. Presto...overvoltage warning. Reconnect the wire, everything green again. Same results on second test supply.
Comment