How much is the acceptable variations in the PSU's out dc voltages?

By Insong ·
My current problem is the computer will not boot. With PSU connected to motherboard i measured the dc voltages out PSU but these were less 0.5 to 1v. The green wire, the power_on line, has no voltage when measured, are these OK?

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No the figures are not OK

by OH Smeg Moderator In reply to How much is the acceptabl ...

But probably more importantly what is the computer doing?

Also have you tried measuring the voltages with the PS not connected to the M'Board?


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Well, the power supply is off, so those are normal

by robo_dev In reply to How much is the acceptabl ...

As I recall if you ground the green wire it should start any ATX PSU.

"The motherboard controls the power supply through pin #14 of the 20 pin connector or #16 of the 24 pin connector on the motherboard. This pin carries 5V when the power supply is in standby. It can be grounded to turn the power supply on without having to turn on the rest of the components. This is useful for testing or to use the computer ATX power supply for other purposes."

Note that if there is a short in the motherboard and your turn on the PSU, the failed component may be easy to spot, as it will be the one emitting 'magic smoke' and or a small amount of flame.

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