Murlocke

I need to get inside my PSU, and to avoid shock I need to drain it, I read that unplugging the PSU from the wall and keeping the switch on (on the psu) and pressing the power on button on the computer a few times drains it. The wierd thing is the lights and fans should spin for a split second on the first power on, then it should be drained.

It doesnt do this with my PSU (one in rig). I've unpluged it from the wall, kept the PSU switch on, press the power button on my comp and nothing happens....

Any advice?

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cgrado

maybe it's drained?

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Erind

but just to be sure I say wait a couple of hours(maybe more) before unscrewing anything

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Murlocke

yea im going to wait 24hours just to be safe, thanks

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lessthanjake1241

just because nothing happens doesnt mean its drained, be careful. the capacitators can hold charges, however small, for weeks.

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Mister Crowley

Touching the leads with your finger would drain them. (Im Serious.)

You wouldn't even notice on little caps like that. Dont try this with a flux capacitor in an arc welding machine, it might kill you.

Open that thing up!

Namrac

^No, don't. The capacitors in a PSU can hold a charge strong enough to kill you for years.

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Mister Crowley

The capacitors in a power supply come after the transformer and are mostly in the filter sections for the voltage rectifiers. The caps run around 12-20 volts.

I used to make power supplies for my home made amps (they were ok)

Edit: I wouldn't touch one to my tongue....

xavier111

[quote=Mister Crowley]Touching the leads with your finger would drain them. (Im Serious.)

You wouldn't even notice on little caps like that. Dont try this with a flux capacitor in an arc welding machine, it might kill you.

Yes, and as we all know, Flux Capacitors have an output of 1.21 Jigawatts!
That was a joke Mister Crowley, so please dont take any offense.
A resistor is perfect for discharging a capacitor. The size of the resistor is dependant on the working voltage of the capacitor. I usually use a ratio of 25/1, meaning 25 ohms to 1 working volt. So for a PSU at 120 volts, I would use a 3000 ohm resistor. Take a pair of insulated needle nose, and while holding the resistor, touch the two solid core wires, one to each side of the capacitor's terminal. I recommend holding it there for atleast 15 seconds to fully discharge the capacitor. Hope I helped any.

ENTERPRISE

Example of what not to do!

If i where you mate i wouldnt go messing about inside of a PSU really they can hold a lethal charge for a very long time.

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