Re : Is there really a difference in Intel and AMD approved power supplies
"-Alby Hewlet" wrote in message ...
I've also learned that you can't trust mobo voltage reporting at all and must check voltages with an accurate meter (digital) Even then you may be up the creek. I just finished working on a system where the problem was the power supply. Had 350 wt ps in it. All voltages, measured at the molex connector, when it was plugged into the motherboard and turned on, measured within specs, yet it couldn't boot the system. A cheap 250 wt spare I had in the parts bin booted it perfectly every, so you can't tell just by measuring the voltages either. Well, you can if you get a bad reading, but all good readings don't mean the ps is good. If I have it figured out correctly, thanks to Ric in another NG, the RC circuit regulating the power ready voltage wasn't rising fast enough. With out a scope you can't detect that. If it comes up too slowly, the system won't boot. I had that problem with my old FIC PA-2007 mobo (VIA chipset). It wouldn't work with my cheapo PSU unless I hit the reset button, but it had no problems with an ancient IBM brand PSU that contained about twice as many parts. The cheapo's power-ready circuity consisted of just a transistor and an R-C network while the IBM's was on a separate circuit board and had a comparator and some precision resistors and measured not only the time delay but also all the voltages and even checked for operation of the power oscillator. I didn't have an oscilloscope, so I had to pay with R-C values in the cheapo PSU until the mobo would boot reliably. |
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