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**kc8adu** · 10-03-2009, 05:40 AM

Re: Which Caps fail without showing it?

depends if the failure is due to impure aluminum,bad electrolyte,or it dried out due to heat.

**KeriJane** · 10-03-2009, 08:32 AM

Re: Which Caps fail without showing it?

Hi C hegge

Any capacitor can fail without visible damage.

Chemi-Con KZE are famous for this as well as OST, but any brand or series has the potential to malfunction without leaking or bulging.

The Chemi-Con KZE failures appear to be heat related as they tend to fail in hot areas. But it may also be the use they are put to. (Possibly overloaded?)

It all depends on what killed it. The common "gassing" condition that leads to leaks and bulging is often a sign of overloading, overheating, impure aluminum or bad electrolyte.
But... it doesn't have to build internal pressure to fail! (like the KZE)
Alternately, the can may be too strong and well sealed with a badly executed "vent" to show any evidence of high internal pressure.

If it looks bad, it's bad.
If it looks OK, it needs further testing!
Keri

**linuxguru** · 10-03-2009, 09:42 AM

Re: Which Caps fail without showing it?

G-Luxon, Tayeh, Teapo, OST, GSC, Evercon...

**Wizard** · 10-03-2009, 11:18 AM

Re: Which Caps fail without showing it?

Linuxguru, Does not matter.

I have a SMPS board for LCD TV waiting to be recapped that aren't swelled up at all.

Cheers, Wizard

**Topcat** · 10-03-2009, 04:16 PM

Re: Which Caps fail without showing it?

teapo is the most notorious one I've seen for failing without showing signs. Seen MANY motherboards and power supplies loaded with teapos that physically appear OK, but upon checking them, they're way out of spec or just open.

**momaka** · 10-03-2009, 07:22 PM

Re: Which Caps fail without showing it?

Originally posted by KeriJane

The Chemi-Con KZE failures appear to be heat related as they tend to fail in hot areas.

I though it was the Chemi-con KZG (and possibly KZJ) that were the problematic ones (or did I miss a thread somewhere?).

Originally posted by linuxguru

G-Luxon, Tayeh, Teapo, OST, GSC, Evercon...

From the pictures I'm seeing on this forum, I'd say GSC/Evercon/Sacon don't quite belong to that list. They seem to go *pop* more often than not.
If they made firecrackers, though, I would totally buy them

.

**linuxguru** · 10-03-2009, 10:33 PM

Re: Which Caps fail without showing it?

GSC/Evercon/Sacon do bulge/vent, of course - but even if they're not bulged/vented, they may still be completely out of spec. My guess is that many of these quiet-death caps vent slowly and continuously out of the bottom seal, drying out over time as the water gets completely electrolysed.

**ratdude747** · 10-03-2009, 10:53 PM

Re: Which Caps fail without showing it?

oddly, teapo/ost/tayeh/iq seem to belong to a different branch of bad caps. the have these symptoms:

-often fail silently
-usually do ok in power supplies provided they are well ventilated and the psu has a good fan. usually, that is.

its odd... but remember:

tayah is made by teapo (same symptoms, some had the imfamous teapo vent stamp, later confirmed with paper trail i think)

iq is made by ost- we have seen caps with both logo's at the same time, same symptoms

gsc became evercon and later sacon. gsc was discovered to be evercon when identical symptoms showed up and later, someone noted they had the same fax machine number and address. idk how the sacon-> evercon/gsc link was made.

**c_hegge** · 10-03-2009, 11:00 PM

Re: Which Caps fail without showing it?

OK, Thanks for the replies everyone.

KeriJane and momaka, I've never seen a failed Chemi-con KZE (unless it's polarized incorrectly, the voltage is too high, or it gets put in a fire

). It's KZG and KZJ that I have found to be failure-prone.

**Topcat** · 10-04-2009, 01:05 AM

Re: Which Caps fail without showing it?

Originally posted by ratdude747

oddly, teapo/ost/tayeh/iq seem to belong to a different branch of bad caps. the have these symptoms:

HUH? That is inaccurate. Teapo belongs in the list of non-venters, as they do indeed fail frequently without showing signs. The rest almost always vent, swell, and leak. I see them every day. OST has gotten a little better about failing without venting, following in teapo's footsteps, but my god man, IQ and teyah's bloat and splooge to this day, where have you been!!

**kc8adu** · 10-04-2009, 10:01 PM

Re: Which Caps fail without showing it?

just had 2 shuttle ss51 boards with ost/iq that were high esr.like .25 ea.
no leakage or bulging but the bungs were oily looking.this was a several bsod an hour wonder.
had a big box of the tiny white netgear wireless routers that crime warner issues around here.teapo's were either open or several ohms esr.none bulged.

**Toasty** · 10-05-2009, 01:32 AM

Re: Which Caps fail without showing it?

>>...I've never seen a failed Chemi-con KZE (unless it's polarized incorrectly, the voltage is too high, or it gets put in a fire...<<

I've a bunch of iMac PSU's here with many failed KZE's. No vents, but low value and high ESR (and dead PSU). It's about as hot a fire you can get, without the flame, in there.

Toast

**RJARRRPCGP** · 10-05-2009, 06:13 PM

Re: Which Caps fail without showing it?

Don't you mean the KZGs?

I heard they have problems with heat.

**PCBONEZ** · 10-05-2009, 08:01 PM

Re: Which Caps fail without showing it?

KZG are the ones 'famous' for failing without bloating.
KZJ use the same electrolyte as KZG so they are suspected of it but they aren't common enough to see many failures.
-
Haven't seen or heard of such a problem with KZE.
- Any lytic cap you put in a roaster oven will fail. Even MBZ.
.

**PCBONEZ** · 10-05-2009, 08:35 PM

Re: Which Caps fail without showing it?

Back to your question:

Originally posted by c_hegge

I've seen OST (Taiwan Ostor Corporation) capacitors fail without bulging, and others say that Teapo can do it, but are there any others? Or are these the only ones?

ANY -can- do it.
Five+ years ago a lot of them were doing it.
OST and KZG are the most famous for it in RECENT history.
Part of the reason is probably that most of the others don't show up on motherboards that often anymore in comparison to how often OST and KZG are used.
.

**ratdude747** · 10-05-2009, 09:30 PM

Re: Which Caps fail without showing it?

ok, so i fail at informing. i had thought those were fine in vented psu's. i had also heard iq (same as ost) silent fails a lot, as does teapo (and presumably tayeh)

**PCBONEZ** · 10-06-2009, 09:58 AM

Re: Which Caps fail without showing it?

Less likely to fail in vented PSU's [or rather, with good cooling 'where ever' they are] but that doesn't make them ones you -want- to see in your gear.
.
You might be right about Teapo and silent fails but I haven't experienced it as far as I know. "As far as I know" because I don't bother checking Teapo pulls from motherboards. I just change them if they are 6mm or up.
.
I do think Tayeh was a Teapo product.
Maybe another product line or caps Teapo OEM'ed to someone else.
Reason is I've seen Tayeh branded caps with Teapo's trademark vent.
[The Y stamp with short bars between each of the legs.]
.

**larrymoencurly** · 10-25-2009, 04:46 PM

Re: Which Caps fail without showing it?

My Asrock K7VT4 Pro mobo (Socket A) had 15 Ltec 1000uF, 6.3V LZP caps. The two for the DDR voltage and the one for the north bridge voltage were bulging, but the rest measured 0.03 ohm ESR and were not bulging, not even those for the AGP slot voltage (Nvidia FX5200 card).

**Wizard** · 10-27-2009, 11:06 AM

Re: Which Caps fail without showing it?

Like I said, doesn't matter. I have large share of non-bloaters in any kind of capacitor makers.

I just changed a 10uF Lelon. Not bloated, simply dried out, used in Vertical circuit of TV.

Cheers, Wizard

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Which Caps fail without showing it?

Which Caps fail without showing it?

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