Fake primary capacitors

[tom66]

Re: Fake primary capacitors

People have to remember most manufacturers don't care about Fuhjyuu caps -- they use them because they're cheap. And I'll bet they're easier to fake as there's less vigilance over them. So if supplier X suddenly has a large supply of Fuhjuuu and the procurement manufacturer can get a raise by dropping the per-unit cost by 20 cents then you will see fake Fuhjyoo.

[Heihachi_73]

Re: Fake primary capacitors

No-one would be dumb enough to fake a Fuhjyyu. Although, one could probably dress up a Fuhjyyu as a KZG and no-one would know the difference.

[Pentium4]

Re: Fake primary capacitors

Weird!

Or, WHAT THE HEC!

Even the fuhjyyu is overrated! :P

The Fuhjyyu is actually within tolerance (barely...), so it isn't necessarily fraudulently labelled.

Yeah you're right. I measured the other one that ran along side it and it measured 433uF so I assumed they were really 470's I should have posted the picture of that one

[Shocker]

Re: Fake primary capacitors

The Fuhjyyu is actually within tolerance (barely...), so it isn't necessarily fraudulently labelled.

[ben7]

Re: Fake primary capacitors

Weird!

Or, WHAT THE HEC!

Even the fuhjyyu is overrated! :P

[Pentium4]

Re: Fake primary capacitors

That's a good assumption. Unfortunately it depends...Another 470uF HEC input cap that was black instead of blue was actually 470uF. And a CS cap that I figured would be fake was its actual value. I wish they were more consistent!!!

[momaka]

Re: Fake primary capacitors

Wow, more fakery (is that even a word, btw?). I guess from now on, when I see primary caps from unknown Chinese manufacturer, I will just assume the capacitance is 1 level lower than what is printed on the sleeve. Even though it may not be the case for every cheap cap brand, I think it's a safe assumption regardless.

[Pentium4]

Re: Fake primary capacitors

I know this is an old thread but wanted to share some...These caps came out of Coolmax, L&C, Sun Pro, and Logisys PSU's

[goodpsusearch]

Re: Fake primary capacitors

Someone trying to fake Capxon... Priceless

[momaka]

Re: Fake primary capacitors

momaka, I would think that while sitting on the shelf unused for a long time, the aluminum oxide layer might thin, resulting in a lower maximum voltage, but a higher capacitance.

Maybe... but the ESR Micro V4.0 meter I used at work to test the caps showed otherwise. I tested several other capacitors (both HV and non-HV), and they all showed proper values. For example, a 450V 68uF CapXon from a TV made in 2006 was showing 66uF. Also, a 16V 1500uF Nichicon HN was showing 1510uF and 0.01 ESR. So I believe the meter is working right.

Perhaps the 200V 330uF CapXon KM's I have are fake ? Unlike regular CapXon KM which are black, these are dark blue with light blue for the (-) stripe.
But who knows. They are quite old too, so maybe that's the sleeve color CapXon decided to use at the time.

[PeteS in CA]

Re: Fake primary capacitors

momaka, I would think that while sitting on the shelf unused for a long time, the aluminum oxide layer might thin, resulting in a lower maximum voltage, but a higher capacitance.

[goodpsusearch]

Re: Fake primary capacitors

Measured 2x 200V 330uF CapXon KM from 1999 the other day. They both showed 232uF and 228uF respectively - quite a bit low. Now, I understand they are old (I pulled them from the PSU they were in back in 2003), but still it seems that their capacitance is way too close to 220uF for this to be a coincidence. So perhaps CapXon is doing the same thing as these other crap manufacturers (i.e. marking the capacitance up)? I wouldn't be really surprised if they did.

I have measured 1000uF Capxon and JunFu primary caps from my Jou Jye power supplies and they showed ~1000uF

[John Doe]

Re: Fake primary capacitors

And now with decently-built power supplies from respectable brands (FSP, Seasonic, Antec Basiq series, etc.) that are priced between $40-$60, I believe their is really no reason to purchase $20-$30 gutless wonders. It is worth spending the extra $20-$40 (or more even) on a quality power supply, than to have hundreds of dollars worth of computer parts up in smoke by a gutless wonder.

It's been that way for years. Long ago you could have gotten halfway decent units like CM Real Power's for that much, which were miles ahead of generic units.

I got a few old Topower's I'm now using as doorstop. I could re-cap, replace the fan and hell, even the transformer seems shoddy. But why bother? Today $50 can get you a SF Golden Green 450 unit which blows away many other PSU's that it just seems pointless to bother with crap units.

Measured 2x 200V 330uF CapXon KM from 1999 the other day. They both showed 232uF and 228uF respectively - quite a bit low. Now, I understand they are old (I pulled them from the PSU they were in back in 2003), but still it seems that their capacitance is way too close to 220uF for this to be a coincidence. So perhaps CapXon is doing the same thing as these other crap manufacturers (i.e. marking the capacitance up)? I wouldn't be really surprised if they did.

Could be aged, or yeah, overrated. CapXon's are a notch below Teapo. Most units I've seen with CapXon's tend to have a wiggly shape of ripple, they just can't straighten it out. And they used to fail on Epsilon units.

[momaka]

Re: Fake primary capacitors

Measured 2x 200V 330uF CapXon KM from 1999 the other day. They both showed 232uF and 228uF respectively - quite a bit low. Now, I understand they are old (I pulled them from the PSU they were in back in 2003), but still it seems that their capacitance is way too close to 220uF for this to be a coincidence. So perhaps CapXon is doing the same thing as these other crap manufacturers (i.e. marking the capacitance up)? I wouldn't be really surprised if they did.

[Newbie2]

Re: Fake primary capacitors

And now with decently-built power supplies from respectable brands (FSP, Seasonic, Antec Basiq series, etc.) that are priced between $40-$60, I believe their is really no reason to purchase $20-$30 gutless wonders. It is worth spending the extra $20-$40 (or more even) on a quality power supply, than to have hundreds of dollars worth of computer parts up in smoke by a gutless wonder.

[PeteS in CA]

Re: Fake primary capacitors

When I was at Delta Products our sales VP gave me a "250W" ATX cheap no-name to look over. It was enough to cure me of such cheap crap. I guesstimated it as actually good for maybe 120W-140W and spotted several glaringly obvious safety agency standard violations. Cheap crap is cheap because it's crap ... and it may prove to be expensive if you use it.

[Newbie2]

Re: Fake primary capacitors

This looks like a very good reason not to go all cheap and purchase some $30 "500W" power supply; they come equipped with components that don't live up to their ratings!

[b700029]

Re: Fake primary capacitors

Unfortunately it isn't easy to determine who originally made those caps, because electrolytics all look identical internally. Perhaps an analysis of the electrolyte composition may work, but manufacturers keep their compositions a trade secret. Only by comparing with known brands and series would that be any use. This might be another explanation as to why the vent stamps of cheap caps look like those of more expensive ones too.

[PeteS in CA]

Re: Fake primary capacitors

Another thing that might be happening is some one bought cheap a bunch of surplus decently made, properly rated caps, removed the shrink-wrap sleeve and put on no-name sleeves with the capacitance rating bumped up, and sold them at a profit knowing they weren't likely to get caught.

My previous employer once considered buying what was purportedly a high-end ST Micro MOSFET which was in short supply from a non-authorized distributor. Purchasing was suspicious, so they got some samples and sent them for testing to the Component Engineering people (which included me). Not only could we tell the samples weren't what their markings said, but one of our tests told us that the parts were really a very decent, but older and not suitable for the product for which they would have been used, MOSFET made by IR.

[severach]

Re: Fake primary capacitors

I've found the same thing. The cheapo power supply input caps caps measure substantially lower than the label. I think it's because they know that the power supplies they are going into are still going to work at the lower capacitance.