Jee caps
I've just pulled a slightly bulging jee cap from a psu. Its esr was 160!
Whats's the biggest esr ever measured here on badcaps.net?
Whats's the biggest esr ever measured here on badcaps.net?
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Re: Jee caps
My peak meter only goes to 40ohms no higher just says its failed lolPlease Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !
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Re: Jee caps
someone mentioned a bad kzg cap reading 2000 ohms esr? lol but i imagine some completely burst open junk caps can even read open circuit or infinite resistance lolComment
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Re: Jee caps
^ I don't recall that. I said in another thread that UCC specified a 5x11 0.1uF 50V SMG as having a maximum acceptable ESR of almost 2,000Ω ESR (at 20˚C and 120Hz) in the datasheet (which is ludicrous - it may as well be a resistor at that point). Highest recorded ESR of a failed KZG is 100Ω by PlainBill.
A capacitor that is open circuit would indeed have infinite resistance, suggesting the liquid electrolyte has completely dried up. A capacitor that is shorted (zero resistance) suggests great damage to the dielectric. A capacitor that reads fine for ESR but not capacitance denotes that the surface area of the aluminum oxide or foil has shrunken over time. It's a common failure mode for those capacitors based on organic solvents such as Ethylene Glycol or even γ-Butyrolactone. And it's probably why certain Rubycon series have a tendency to go out of spec in terms of capacitance as they age.
Jee has always been some of the worst bottom-of-the-barrel junk. No surprise one reads 160Ω. Some capacitors do fail to such an extent that no ESR or capacitance meter will give you a reading.Comment
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Re: Jee caps
High leakage current = dramatically damaged or thinned oxide layer. That's why leakage current increases as capacitors sit in storage with no voltage across their plates (the oxide layer slowly dissolves into the solution until the capacitor is reformed and rebuilds the layer).Last edited by Wester547; 09-04-2016, 08:56 PM.Comment
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Re: Jee caps
jeez... these caps.Don't buy those $10 PSU "specials". They fail, and they have taken whole computers with them.
My computer doubles as a space heater.
Permanently Retired Systems:
RIP Advantech UNO-3072LA (2008-2021) - Decommissioned and taken out of service permanently due to lack of software support for it. Not very likely to ever be recommissioned again.
Asus Q550LF (Old main laptop, 2014-2022) - Decommissioned and stripped due to a myriad of problems, the main battery bloating being the final nail in the coffin.
Kooky and Kool Systems
- 1996 Power Macintosh 7200/120 + PC Compatibility Card - Under Restoration
- 1993 Gateway 2000 80486DX/50 - Fully Operational/WIP
- 2004 Athlon 64 Retro Gaming System - Indefinitely Parked
- Main Workstation - Fully operational!
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
This one should make @Pentium4 smile
(if he is still reading BCN forums) – I got a new old stock / open box Casing Power MPT-301 PSU on eBay for $4 total. 
Yes, it’s a very generic-looking box, but the manufacturer isn’t (at least not back in the days), which is…
Macron Power Technology Co. LTD.
Let’s look at the PSU itself.
The shell/case also appears quite generic, like many “sold-with-the-PC-case” units. However, the shell is well-formed and has decent steel thickness. In terms of... -
I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
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