KZG's still bad?

[Behemot]

Yo guys, I got Lenovo M57 microcomputer system in my hands. It is basically full of Chemi-Cons KZG, 1000 uF/6,3 V and 1500 uF/10 V. The big question is are they still bad, or has Nippon Chemi-Con changed the electrolyte?

Cause, you know, it has to hold at least a year when I will provide warranty reselling it, on the other hand, if they are good (or at least better than used to be), I can spare my Rubycons and the time, too

I don't know the exact manufacturing year, but they are darker than used to be, marked 8(7) 4R, 8(7) 4Z and 6(T) 2I. I guess this is new dating system as the older one I found definitely won't apply on this. Or they are just OEM's with different marking.

[c_hegge]

Re: KZG's still bad?

KZG are still bad, and I can't see that changing any time soon. Nobody outside of badcaps.net even realizes they are bad.

[Scenic]

Re: KZG's still bad?

Yep.
KZG & KZJ -> avoid like the plague

[Behemot]

Re: KZG's still bad?

You haven't pleased me guys, that means I have to still change them before I will even try to offer it for sale

[PeteS in CA]

Re: KZG's still bad?

The problem is that it takes months to recognize there's a problem, get NCC to recognize it and cleanse stocks at OEMs and Disties. Hundreds of thousands or millions of the things are "out there", many already installed. Then there's the purged parts ... there are many paths to the grey market between various stockrooms and the recyclers.

[Behemot]

Re: KZG's still bad?

But they manufacture this for some 8 years now…?

[mockingbird]

Re: KZG's still bad?

The problem is that it takes months to recognize there's a problem, get NCC to recognize it and cleanse stocks at OEMs and Disties. Hundreds of thousands or millions of the things are "out there", many already installed. Then there's the purged parts ... there are many paths to the grey market between various stockrooms and the recyclers.

I think that by this point, they are aware of it:



Most likely the electrolyte formula has more now to do with "planned obsolescence" than it has to do with negligence. Though we can never forget the old adage "Never attribute to malice that which is adequately explained by stupidity."

[PeteS in CA]

Re: KZG's still bad?

I think the KZG and KZJ may have come into production in 2007 or 2008; if so, 4 or 5 years ago. Those years would be the time frame when I tested them. They did not do well, nor were they spectacularly bad. Obviously, the samples I tested were relatively new, so if the trouble takes a few months to develop, my tests (and at least some of mobo companies' - and possibly NCC's - tests) would not have caught that problem. Once in production and qualified by OEMs, there is significant inertia and reluctance to recognize/admit a serious problem with a carefully tested critical part. NCC's reputation is/was golden; when you have 10s or 100s of thousands of parts in stock and in constant use, the, "Oh, bleep! You want me to stop the line?!" reluctance is very large.

There are a lot of UCC/NCC sales people wandering around Asia, EuroLand and the Americas right now wearing asbestos-and-kevlar business suits.

[mockingbird]

Re: KZG's still bad?

I think the KZG and KZJ may have come into production in 2007 or 2008 ; if so, 4 or 5 years ago

Did you not see the pic I posted? July 2003... That's short of 9 years... There's no way a company could not know of a defective product for that long... Nichicon fixed their HM/HN series late '04... I don't know how long the HM/HN series have been around.

[ratdude747]

Re: KZG's still bad?

Nichicon fixed their HM/HN series late '04... I don't know how long the HM/HN series have been around.

IIRC the bad ones began in 2001...

[PeteS in CA]

Re: KZG's still bad?

Did you not see the pic I posted?

No. For whatever reason, the computer from which I posted, the one I'm using right now, didn't/doesn't show that picture.

[Th3_uN1Qu3]

Re: KZG's still bad?

It shows here. It says KZG New Series Engineering Bulletin Jul 03.

[PeteS in CA]

Re: KZG's still bad?

It shows here. It says KZG New Series Engineering Bulletin Jul 03.

I was posting from a shared computer at work (during break time). Network security there screens out a lot of stuff, though sometimes rather quirkily.

[mariushm]

Re: KZG's still bad?

I've seen motherboards on newegg with KZG series, for example this Foxconn with AMD E-350 (which is probably a cpu not older than 1 year)

http://www.newegg.com/Product/Produc...82E16813186212

If you zoom on the pictures, you can see functional polymers mixed with 1000uF 6.3v KZG and Teapo's.

I doubt Foxconn is really using super old stocks...

[Behemot]

Re: KZG's still bad?

Yeah it is my case as well. There is few polymers, but the rest is KZG and the small are even some crappy brand…

[Topcat]

Re: KZG's still bad?

I still see KZG and KZJ bad all the time, and in newer hardware. Avoid.

[severach]

Re: KZG's still bad?

2000 hour KZG caps aren't expected to last. We're just annoyed when these 2000 hour caps fail a lot sooner than other brands' 2000 hour caps. Either KZG is overrating or other brands are underrating.

[c_hegge]

Re: KZG's still bad?

KZGs are just bad. Probably more like 100 hours endurance.

[Behemot]

Re: KZG's still bad?

NCC ceased to manufacture them? They are no longer in group chart! http://www.chemi-con.co.jp/e/catalog...m_diagram.html

[c_hegge]

Re: KZG's still bad?

That must be their solution to the problem