I'm troubleshooting an ASUS P5B motherboard that won't post, starting with my Power Supply. Using a multimeter, and referencing this guide, this pinout chart, and these tolerance specifications, here are my results:
First, the power cord from my receptacle is giving 122.3VAC, which is out of the -6% to +10% tolerance for 110VAC (103.4VAC to 121VAC). So my PSU is getting slightly too much voltage, and the story continues with the 24-pin connector. I tested a few other receptacles and they all put out around 122VAC.
All of the +5VDC pins (#s 4, 6, 9, 21, 22, 23) are putting out 5.3VDC, which is above the tolerance maximum of 5.250VDC. The +3.3VDC and +12VDC pins are all within tolerance.
Is a PSU supposed to condition the incoming voltage before outputting to the motherboard? Since mine is passing higher voltage than spec, does this mean the PSU is bad?
Thanks!
First, the power cord from my receptacle is giving 122.3VAC, which is out of the -6% to +10% tolerance for 110VAC (103.4VAC to 121VAC). So my PSU is getting slightly too much voltage, and the story continues with the 24-pin connector. I tested a few other receptacles and they all put out around 122VAC.
All of the +5VDC pins (#s 4, 6, 9, 21, 22, 23) are putting out 5.3VDC, which is above the tolerance maximum of 5.250VDC. The +3.3VDC and +12VDC pins are all within tolerance.
Is a PSU supposed to condition the incoming voltage before outputting to the motherboard? Since mine is passing higher voltage than spec, does this mean the PSU is bad?
Thanks!