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Problems with my psu, after sleeving

post #1 of 4
Thread Starter 
Hello everybody.

I´m looking for some help in this place, so i would very glad if anybody could help.

Well, the storie is the next one:

I have an AX1200, i destroyed the cables and i make my own cables from zero., I follow the pinout from moddiy and devious dog... and i put like them the pinout and the psu doesn´t power on.

Here some results of it using that pinouts ( i don´t say the pinout are bad, only they aren´t usefull to me):



Those results are following the pinout above.

Here the result from my own pinout (i have to test each pin to build a custom mine, because i lost the paper where i wrote the pinout). The results was taken, making a bridge between "ps on" pin and a ground pin


At first, the voltages are ok, but when I connect the 24pin cable to the Chinese generic tester or Dr Power II (I try with both), the result is the PSU doesn´t power on.

I filmed a video, where you can see how i switch on the psu and the fan makes the intention to move, but only hears a "cla cla" sound.


If anybody could give me some help... i would be very happy

thanks so much

p.d i also make a bridge between "ps on" + ground, without the 24pin cable, and connect a periphial cable (6pin) with a nidec fan, and fan moves....
post #2 of 4
Don't attempt to bridge the Power_On signal with a wire because if you bridge the wrong wires together, you could damage the power supply. So instead use a resistor rated for about 300 or 500 ohms and at least 5 watts because 300-500 ohms is low enough to activate the Power_On signal but high enough to prevent excessive current from causing damage (damage from excessive voltage is still possible). You want at least 4-5 watts because in the worst-case misconnection, between +12V and -12V, a 300 ohm resistor can dissipate nearly 2 watts, which will make a 2W resistor boiling hot, but a 5W resistor will stay cool enough to be safe (but not comfortably so).

Where did you splice the new wires into the old ones? If you removed the old wires completely from the circuit board, then sorting out the wires will be more difficult, especially those for Power_On, Power_Good, and +5Vstandby. I hope the circuit board is marked for those signals. I suspect a mix-up among those wires. What voltage do you measure for the Power_On pin when it's not bridged? It should be about +5V, and if you connect a 500-1,000 ohm resistor between it and a properly working purple +5Vstandby wire, the Power_On pin should measure almost exactly +5V. Also measure the COM wires while the PSU is turned off. Hold the black meter test lead against an unpainted metal part of the PSU case.
post #3 of 4
Thread Starter 
i don´t have enough knowldege to make that you suggest..

So i have two options:

- go to a electrician friend and check the psu


- buy another psu
post #4 of 4
You can do it because it's more simple than what you've already done.

In the mean time, do not use the power supply tester until you get all the wires sorted out because the tester may cause a harmful short.

I didn't realize you had a modular power supply, but that should make the task of sorting the wires easier, and most likely the 24-pin connector mounted on the PSU case will have the same pinout as the 24pin connector that plugs into the motherboard, but you must verify this first.

Find the +5Vstandby pin by measuring the voltage between each pin and some bare metal on the case (The bare metal can be a screw inserted into one of the threaded mounting holes). While the +5Vstandby will always measure close to +5V, so may the Power_On pin, but it may measure as low as 3.3V. And the Power_Good pin may measure up to 2V - 3V.

Find the Power_On pin by connecting one end of a 300-500 ohm resistor to bare metal on the PSU case and the other end of the resistor to the pin you want to test. When the PSU turns on, you've found the Power_On pin, and then you can measure the voltages on the other pins to find their functions. The Power_Good pin should measure over 3.3V when the PSU is running.

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