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Old 01-06-2022, 07:50 PM   #1001
momaka
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Default Re: The Hall of Shame - Nichicon HZ series with H05xx date codes

Quote:
Originally Posted by Uranium-235 View Post
Those XFX 7000/8000 cards almost ALWAYS had bad caps. I had next door neighbor over a decade ago with three of them
Yeah, XFX really liked to use those crappy GSC/Evercon/Sacon caps on many (but not all) of their 6000, 7000, and 8000 series of cards. In the case of the bad Nichicon HZ I showed, though - that was a "recycled" cap I scavenged from a dead Xbox 360 motherboard. The whole point was to note that 2005-made Nichicon HZ are fairly unstable and like to go bad, but 2006 and newer aren't (at least not yet. )
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Old 01-06-2022, 08:36 PM   #1002
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Default Re: The Hall of Shame - Badcaps Photo Montage

"SI" cap, IIRC:

https://www.badcaps.net/forum/showpo...postcount=3149
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Old 01-08-2022, 02:00 PM   #1003
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Default Re: The Hall of Shame - Badcaps Photo Montage

Okay, here is my contribution. A few years ago I used a Motorola power supply that was from a retires base-station police band radio. I used it to build a 20amp power supply to run some of my radio gear.
I walked into the shack one day and I could smell something burning. I looked around but did not really see anything. No visible smoke. I noticed this power supply was off. I could tell this was where the stink was emanating from. I just took it out of service, set it aside and used another power supply.
I pulled it out and removed the cover today and this is what I found. It about burned my shack down. If it was not inside a metal case I built it might have!! Enjoy!
Attached Images
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File Type: jpg IMG_6883.jpg (994.8 KB, 25 views)
File Type: jpg IMG_6884.jpg (1.28 MB, 30 views)
File Type: jpg IMG_6881.jpg (1.13 MB, 27 views)
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Old 01-09-2022, 08:20 PM   #1004
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Default Re: The Hall of Shame - Badcaps Photo Montage

Look like the cause was something other than the caps. I think Nichicon discontinued the PL series something like 15 years ago, so they had a pretty long life.
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Old 01-09-2022, 10:52 PM   #1005
momaka
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Default Re: The Hall of Shame - Badcaps Photo Montage

Quote:
Originally Posted by PeteS in CA View Post
Look like the cause was something other than the caps. I think Nichicon discontinued the PL series something like 15 years ago, so they had a pretty long life.
Concur.

Actually, I do have a theory of what might have happened there. Being that old, those Nichicon probably had deteriorated rubber seals at such age. If at some point the PSU was "bumped" or exposed to slightly stronger vibration, that could have caused some electrolyte to leak out. Moreover, the PL series are somewhat similar to the PR series of that age in that they both used the quaternary ammonium salt in their electrolyte. Now, the PR series were actually pretty well-known for leaking electrolyte from their bungs after a number of years. PL, on the other hand, not anywhere near as often.

So basically, I'm speculating here that these Nichicon PL caps started to leak a little bit of electrolyte on the PCB. Since electrolyte is quite corrosive, it probably started eating traces away. Over time, it could have caused a weak or bad connection somewhere. On top of that, electrolyte is also conductive and flammable too. So if you have a weak connection and you add a conductive agent to it (possible source of spark or heat generation) that's also flammable... I think that might explain how the small inferno happened inside the PSU. Or does that sound like a big tinfoil hat theory?

And in any case, the big question is: why didn't the PSU's protection circuitry shut it down?
All in all, that PSU doesn't look like a cheapo no-name dubious brand. But perhaps it just lacks/lacked modern protections (aside from maybe complete short-circuit)?

Last edited by momaka; 01-09-2022 at 10:54 PM..
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