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how to deconstruct a PSU to replace fans

B

boran

Golden Member
hi, I have an enermax E-365-P-VE (350 watt's 2 fans, not themally controlled)

and I'd like to replace these two fans with Pabst fans (because these are quiter and I dont like the noise)

but I know the PSU keeps a lot of power within it's capacitators, so how do I remove that charge from the capacitators ?

can it be done by waiting for the power to drain (and if it can be done, how long would it take ...)


and another note .. does a PSU dissapate less heat when the system is inactive ? because then I can switch those fans to 7 volts when I go to bed (would shave another few decibels off the sound ...)

and would it be damaging to the PSU if I replaced the fans with lower CFM rated fans (cous pabst dont really have a high RPM

the rest of the system will not dissapate much heat because it will be watercooled and there R four intake fans ....




 
I've replaced fans before, and its not really hard. You basically just unscrew the fans, change connectors possibly if you need to, so that they are powered, and screw it back up. Dont touch the capacitators and you'll be fine, if you want to be careful I heard that letting your p/s sit for a couple days or overnight, the charge will have dissipated, but I'm not sure.

Good luck
 
well, and now my second part of the question ...

does a PSU generate less heat when teh rest of the system isnt used as much (when the system is into sleep, no vidcard, no drive activity, not much fan activity)

 
What I did to an extra Deer PSU I had lieing around was take off the top, snip off the fan at the wiers, and solder in a new one. It was bigger than there was room for, so I actually kept the top off, but I use it to test things outside of my PC anyway now, so that doenst matter 😉.

anyway, I just unscrewed the top, snipped the old fan, soldered the new fan, screwed it in, and was done. Never had any trouble with shockking mysely.

heh 😀

edit:

maybe I should mod my current PSU to look like one of those enermax's with dual fans....DOH! I knew I shouldnt be hanging around these board! You people give me too many ideas! 😉
 
Capacitors of the PS or monitor magnitude can store their charges for quite some time, even years. The best way I know of to discharge caps is to unplug their power cable, then try to power up your computer. That will suck the charge in the caps out 😉

As long as a PS has some air flowing through it, it should be fine. With the small volume of the PS casing, almost any 80mm will be suffcient. I would opt for a Panaflo L1 though, since Papsts are expensive here in the U.S. 🙂
 


<< As long as a PS has some air flowing through it, it should be fine. With the small volume of the PS casing, almost any 80mm will be suffcient. I would opt for a Panaflo L1 though, since Papsts are expensive here in the U.S. 🙂 >>



here it's the other way around 😀 so pabst is the way to go for silent fans, there will be two fans innit but 2 120mm's sucking air out too so I dont know if it'll get enough airflow ...

 
what model of papst fans are you going to get boran? i'm thinking of getting some to replace my psu fan too if i can find papst here in my country. also, do you know the model name 80mm papst fans for use with heatsinks and case fans?
 
I'll be using 2 PAPST 120mm 4412FGL for my radiator, specs:

Size : 119x119x25mm
Power consumption : 1.25W
Fan speed : 1600rpm
Noise : 26dBA
Air volume : 94m³/h = 55.3 CFM
Sintec sleeve bearing


then 1 PAPST 92mm 3412NGL in the bottom of my PSU, specs:

Size : 92x92x25mm
Power consumption : 1.2W
Fan speed : 1950rpm
Noise : 23dBA
Air volume : 61m³/h = 35.9 CFM
Sintec sleeve bearing


and then 5 PAPST 80mm 8412NGM as 2 back, 2 front, 1 in PSU, specs:

Size : 80x80x25mm
Power consumption : 1.3W
Fan speed : 2600rpm
Noise : 26dBA
Air volume : 58m³/h = 34.1 CFM
Sintec sleeve bearing


Total calculated dBa (using this calculator) : 34.8 dBa
Total Watt usage : 10,2 W

Total airflow in: 136,4 CFM (front & back fans)
Total arflow out: 144,7 CFM (top fans on rad & PSU fan)

- maybe I'll use a PAPST 80mm 8412NGL fan on the PSU lowering the total air out to 130 CFM (and giving posetive case pressure, making dust intake less, but also lowering the CFM on the PSU to 19,4 CFM ....)

and I'll be using a fanbus to control all fans in my system (in pair) so when I switch em all to their lowest voltage the noise will be even less .... it'll cost quite a lot but It'll be the most silent cool box around 😀

 
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