Go Back   Hardware Canucks > HARDWARE > Power Supplies

    
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old November 22, 2008, 04:39 PM
RCKage's Avatar
Rookie
 
Join Date: Mar 2008
Location: Winnipeg, MB
Posts: 40
Default Safe to open?

How long is it recommended to leave a PSU unplugged to ensure that any charge has dissipated? Im wanting to open up my new PSU to get my sleeving as far in as possible but I've heard they can hold a charge for some time. Or is that just to scare noobs? Not...that Im....uh....a noob or anything....... lol My PSU has sat on the shelf at work in its box for at least a few weeks......good or no?
__________________
"And thus I clothe my naked villany
With odd old ends stol'n out of holy writ,
And seem a saint, when most I play the devil."
Reply With Quote
  #2 (permalink)  
Old November 22, 2008, 05:24 PM
odis172's Avatar
Allstar
F@H
 
Join Date: Oct 2008
Location: Ottawa, ON
Posts: 682

My System Specs

Default

Shut down your computer, Unplug the ac cord from the power supply, then press the power button on the computer. The power supply will attempt to start the computer, thereby draining the capacitors. Press the button 4 or 5 times, waiting a few seconds between each press, just to be safe. You should hear some fans spin a bit on the first press. There may still be some charges left over, so dont go touching any contacts! Use insulated tools, dont ground yourself, and i have even heard of people only using one hand, so if they do get a shock, it wont complete a circuit by going through your chest.
__________________
Laptop: Lenovo T420 - Core i5 2520 - 8GB DDR3
Server: 2 xeon E5530 - Asus Z8N-D6 - 12GB DDR3 - 8x 500GB raid 50 - Perc 6/i - Compucase RA448A00
Reply With Quote
  #3 (permalink)  
Old November 22, 2008, 07:03 PM
Andy's Avatar
Allstar
 
Join Date: Sep 2008
Location: Taichung / Toronto
Posts: 657

My System Specs

Default

Quote:
Originally Posted by odis172 View Post
Shut down your computer, Unplug the ac cord from the power supply, then press the power button on the computer. The power supply will attempt to start the computer, thereby draining the capacitors. Press the button 4 or 5 times, waiting a few seconds between each press, just to be safe. You should hear some fans spin a bit on the first press. There may still be some charges left over, so dont go touching any contacts! Use insulated tools, dont ground yourself, and i have even heard of people only using one hand, so if they do get a shock, it wont complete a circuit by going through your chest.
Damn ... now you have me scared .... to think I could have killed myself the last ten times I opened up a PSU. I've always unplugged the psu, and powered on the pc a couple times, and then pulled it out. Never had a problem.
__________________
SAGER 5165 - Matte Screen (1920x1080) - i7-2630QM - nVidia 555M - 8Gb DDR3 - 120Gb Corsair Force GT SSD - 500Gb Momentus XT - Intel® 6300
Reply With Quote
  #4 (permalink)  
Old November 22, 2008, 07:30 PM
Chilly's Avatar
Hall Of Fame
F@H
 
Join Date: Sep 2007
Location: Ontario
Posts: 2,593
Default

Quote:
Originally Posted by odis172 View Post
Shut down your computer, Unplug the ac cord from the power supply, then press the power button on the computer. The power supply will attempt to start the computer, thereby draining the capacitors. Press the button 4 or 5 times, waiting a few seconds between each press, just to be safe. You should hear some fans spin a bit on the first press. There may still be some charges left over, so dont go touching any contacts! Use insulated tools, dont ground yourself, and i have even heard of people only using one hand, so if they do get a shock, it wont complete a circuit by going through your chest.
This sounds about right, if I were you, I'd PM SKYMTL and ask him to be sure. SKYMTL has taken apart numerous PSU's while reviewing them. I would suspect he has some degree of experience and the Do's/Don'ts of taking apart PSU's. Also I just want to make sure your aware that this will void any warranty you may have on the PSU?

That said, as long as you follow the simple instructions of;

Unplug the PSU from wall,
Immediately afterward, press the PC's power button, a couple times to be sure,
Let it sit for a bit,

Once above is said and done and the PSU should be of drained of any "trapped" power in it. You should be perfectly safe after that to fiddle with it now.

Good luck and lets not see you in any newspapers m'kay?

Last edited by Chilly; November 22, 2008 at 07:37 PM.
Reply With Quote
  #5 (permalink)  
Old November 22, 2008, 07:44 PM
enaberif's Avatar
Hall Of Fame
 
Join Date: Dec 2006
Location: Calgahree, AB
Posts: 10,574
Default

Capacitors can hold a charge for a long time even after being discharged; this is why there is proper ways to discharge them.

I never recommend opening up a PSU unless you ABSOLUTELY need to.
Reply With Quote
Reply


Thread Tools
Display Modes