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This PSU needs to be changed??

Last response: in Components
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June 25, 2012 2:43:05 PM

Hi, a few days ago i have opened my Psu and i have notice some green liguid

upon some capacitors , i think that its time for a new Psu before i explode in

the air....... :cry:  :cry:  :cry:  i did not touch anything due the high voltage of the big 2 capacitors just opened the psu , taken photos and the closed it again.

the psu is still working fine... :sarcastic: 

what do you suggest.... Thanks in advance :D 






More about : psu changed

June 25, 2012 2:44:55 PM

sorry for the big pics its my first time posting with pics.
June 25, 2012 2:55:29 PM

here maybe you can see them better after been resized..



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a b ) Power supply
June 25, 2012 3:41:35 PM

Time for a new one!
June 25, 2012 3:48:26 PM

thanks man!! :D 
a c 88 ) Power supply
June 25, 2012 3:53:31 PM

The caps are fine. The white stuff all over them is a glue thats used so they don't move. Looking at the caps none of them are bulging or look bad in any way. Based only on the caps pic your PSU is fine. I didn't see any green liquid btw.

Edit: Here is a review of a unit. Notice in the pics that the glue is also used. http://www.jonnyguru.com/modules.php?name=NDReviews&op=...
June 25, 2012 4:02:25 PM

yes you are right man. Thanks again you saved me money. :)  i was worried that i would fire up my pc. thanks again.
a c 88 ) Power supply
June 25, 2012 4:06:43 PM

It still might if its a low quality PSU and a voltage spike comes along... But the caps are fine. Nothing wrong there.
a b ) Power supply
June 25, 2012 4:09:24 PM

I second what 47 said. The whitish stuff is a sort of cement/glue used to reduce vibration stress on solder joints and component leads, it has absolutely nothing to do with leaking caps.

I could not find any 'green liquid' either, unless the cement looks green to you.

Nearly all PSU manufacturers do this. Most cements I have seen break off quite easily if you pry components a little.
June 25, 2012 4:11:18 PM

i dont have any problem with spikes its just 3 years old.... its a tagan 600w i know its not the best brand in psu..... i was just wondering... So it can last a bit more... :)  thanks again.
June 25, 2012 4:12:05 PM

yes it looks green to me sorry , i cann not see all colours.... :( 
a c 263 ) Power supply
June 25, 2012 4:41:29 PM

Some Tagans are quite good.
a b ) Power supply
June 25, 2012 5:02:33 PM

Here is an image of typical leaking caps:
http://en.community.dell.com/resized-image.ashx/__size/...

They usually leak from the top where the metal is stamped to make it thinner/weaker so it can act as a safety vent or from the bottom either due to the "plug" popping out from the can or the plug's vent leaking if present.

Additional note on cement found on PCBs between components: it also prevents components from damaging each other from friction - no friction possible when components are cemented together.
June 25, 2012 5:14:31 PM

aha nice information :)  thanks now i can check right.. my psu. but i have one quesion why do they use electrolytic capacitors?? They can not use solid one?? Or solids can not achieve the specs of electrolytic??
a b ) Power supply
June 25, 2012 6:15:40 PM

panokan said:
but i have one quesion why do they use electrolytic capacitors??

Inexpensive, low impedance, good energy density, decent AC ripple capacity (in specific models), reliable when manufactured and chosen properly.

The reasons why electrolytic capacitors fail so often in cheap PSUs are mainly due to low-quality electrolyte (mainly affects cheap Chinese knock-off brands like Fuhjyyu) and using under-specified parts. Cheap PSUs often use only one or two knock-off capacitors rated for 0.7-1A RMS ripple on 20A rails where there may be around 10A RMS ripple. Good PSUs are more likely to have 2-3 major-brand (non-knock-off) capacitors rated for 2.5-4A each which makes them far less likely to fail than the Chinese stuff.

Polymer caps with better performance (5-6A RMS ripple) vs size characteristics are available but they are considerably more expensive.
a b ) Power supply
June 25, 2012 7:04:28 PM

4745454b said:
The latest review on JG shows a PSU with some "solid caps" in it.

But FSP Aurum Gold 1000W at ~$180 has the BOM budget to afford polymer caps.

For PSUs in the neighborhood of $70, the BOM gets much tighter.

Much tighter still when looking at Chinese OEM PSUs that can be had for $20-30.
a c 88 ) Power supply
June 26, 2012 2:18:26 AM

Correct. I was only trying to show there are some PSUs out there with some solid caps. I wouldn't expect the Antec 380W to get them, or any other such PSU. Just not worth it for the OEM.
!