Caps STILL leaking after power has been removed?

[Tom41]

If you look in the PSU Build Quality Pictorial thread, I've posted pictures of my most recent dead PSU. Also there is a close-up picture of one of the leaking Teapo caps, taken just after the PSU was removed from the PC.

Now, here's the strange thing. That particular Teapo cap is still leaking, even though the PSU hasn't been connected to mains since I opened it up! The day it was taken out of service, the cap had a small dot of electrolyte on the top as shown in the photo. The next day, the bottom channel of the Y-vent was full of dried electrolyte. I've just looked at it again, and now all three channels of the Y are full of electrolyte!

As a matter of fact, one of the other bulged caps is now showing a tiny dot of electrolyte on the top as well. Do bad caps continue to leak long after the power has been removed? Is there any other explanation for the leakage?

[i4004]

Re: Caps STILL leaking after power has been removed?

well, the explanation is it's slow chemical process.
nor begining nor termination will be instant...

[severach]

Re: Caps STILL leaking after power has been removed?

I've had leaky caps on boards that had never run other than the factory test.

[Krankshaft]

Re: Caps STILL leaking after power has been removed?

Don't forget that using the caps just accelerates their deterioration.

I remember reading a post on this forum about caps that leaked even before the equipment was ever used!

Fresh out of the box the caps were bulged.

[kc8adu]

Re: Caps STILL leaking after power has been removed?

had another gigabyte board given to me yesterday.
customer bought it for a spare and didnt need it anymore.wanted to know why a new never used board smelled like dead fish.it was stored in a rubbermaid tote which sealed well.
showed him the leaking choyo caps.the server had already been here and recapped due to instability.
its a duallie tualie.
got a jetstream 12v power supply in last week with leaking sc caps.customer tried it from new and it made birdies in their hf rig.replaced the caps and no more birdies.had to been bad from new.