DIY dc PSU from pc power supply

[agp]

hi all,

i'm on the way of doing this. I have just gotten a P4 power supply which supplying 12v @10a.

I cant power on the psu when shorted pin 14(green) with ground. there is 1 2x2 square connector must be connected to mainboard then I can power up.

any idea any1 how to mid this power suply?

[Artyspec]

hi all,

i'm on the way of doing this. I have just gotten a P4 power supply which supplying 12v @10a.

I cant power on the psu when shorted pin 14(green) with ground. there is 1 2x2 square connector must be connected to mainboard then I can power up.

any idea any1 how to mid this power suply?

You need loading on the 5v line.

[agp]

You need loading on the 5v line.

i tried to connect some device like cd-rom. but still cant.

[Super-Hornet]

Hi

So far I haven't see any Computer PSU that require you to load down the 5V in order to power on.

I even have a ATX PSU at my desk that I use to power a Computer Fan when weather is hot. I only tap the 12V and short 2 wires.

For your case, it could be:
1. You short/connect the wrong wire to power it. Is the PSU fan running?
2. The PSU is spoilt/damage. The easiest way to tell is to connect it to a motherboard and try to power it up. Even with motherboard and u cannot power it up, then the PSU is spoilt.

SH

[Artyspec]

I think the loading is to stabilise the voltage. Not sure, but since some ppl do it, no harm just following suit, so i did it. Works like a charm.

[agp]

Hi

So far I haven't see any Computer PSU that require you to load down the 5V in order to power on.

I even have a ATX PSU at my desk that I use to power a Computer Fan when weather is hot. I only tap the 12V and short 2 wires.

For your case, it could be:
1. You short/connect the wrong wire to power it. Is the PSU fan running?
2. The PSU is spoilt/damage. The easiest way to tell is to connect it to a motherboard and try to power it up. Even with motherboard and u cannot power it up, then the PSU is spoilt.

SH

this psu abit funny. lol. connect 1 of the 2x2 m/b cable then can power on.

i tried another power supply. can power on w/o need to connect any cable.

is it normal once 1 removed the shorted pin from the green and black cable, the power supply is off?

[w_kby]

PSB modification

Hi,

Found this PSB modification thread interesting. Hope you find it useful too.

http://www.daddyhobby.com/forum/showthread.php?s=&threadid=3286

[Super-Hornet]

Yup. once you remove the 2 shorting pins, the power will go off.

SH

[agp]

thx guys. got to start work.haha