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Illicit Leaky Capacitors Killing Motherboards
mcd7756 writes "The IEEE Spectrum magazine has an article about how capacitors made with a stolen formula for the electrolyte are leaking and causing motherboards to fail. Some computer manufacturers are admitting to the problem; others are hiding it."
http://slashdot.org/article.pl?sid=02/11/04/175121 0&mode=flat
"Indeed, those who have repaired the damaged boards say that they have encountered crippled motherboards from Micro-Star International, ASUSTek Computer, Gigabyte Technology, and others."
;)
Well shit, and I thought the woolly jumper I wore when I built my box killed it. Now I don't have to feel so bad about sending our broken mobos back and claiming it arrived that way! (I'm joking, I'm joking! Nobody tell Dell or the Cowboy gets it.
Good thing my computer is from 97.
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That was fun, all Abit. The caps develop a bulge
:-)
on top and after a while they leak the stuff out.
Spontaneous reboots, blue screens and all sorts of fun.
I'm just glad it wasn't me doing the replacing
To quote: "The large volumes of passive content in any electronic device means that you have that many more chances for a product to fail". I can see that motherboards that pop are going to be a major pain in the backside, particularly for us small system builders, but what other devices use these suspect capacitors? aircraft? cars? lifts? phones? routers? Anyone care to speculate?
other than this is just further proof of the lenghts corporations will go to in order to make more money. Theft, lies, deceit, are all perfectly acceptable business practices these days, especially in east Asia.
This story has been circulating around for a long time, but this article is a good update on what's going on. I was very surprised to read that manufacturers actually threatened that guy who put a list of problem boards on his website.
You know, this is an all-too-disturbing trend. If you look at the behavior of media-giants, RIAA, MPAA, and now computer hardware makers - they'd all like to see us just locked in our homes, doing what they want us to do, seeing only what they want us to see, and not having any communication with anyone else... because if we can communicate with other people (i.e. by publishing a list of boards that are prone to failure), we'll realize just how badly we're being taken. That would eat into profits, and therefore should be made illegal. Heaven forbid consumers are allowed to make informed decisions..
Starting to sound like Soviet Russia?
This shows that quality comes at a cost. If you truly want to get good quality goods, don't expect to keep forcing the market to make cheaper and cheaper products.
Why would a company steal a formula such as this? so they ddn't have to pay as much for the 'real deal' and then henceforth could sell at a cheaper price and undercut others. When this happens quality suffers.
It has happened in many other industries and frank, I'm surprised it hasn't yet happened in something as stressed and pushed-cheaper as the motherboard and other componentry markets.
Rampant commercialism is causing problems like this
Tech Support : Is there a capacitor leaking on your motherboard ?
Customer : What ???? How dare you talk about my moma like that, tell me right now, who's that #@&*%$ capacitor ?
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From the article:
"Zogbi cites tests by Japanese manufacturers that indicate the capacitor's lifetimes are half or less of the 4000 hours of continuous ripple current they are rated for."
4000 hours for the good capacitors? That's like 6 months of continuous usage. Surely shome mistake?
The batch of SunRay 1 terminals (first generation?) that Sun recalled due to a power supply problem have the faulty capacitors. They were the same brand of capacitors as some dual-CPU MSI motherboards we had that died.
At the time, I also wondered what other devices may have these faulty aluminium electrolytic capacitors, but it appears the answer is not many; probably due to their cost, they seem to be restricted to high frequency switched mode power supplies.
This is old news! (Sep. 2002) I submitted this to /. some time ago, but it was rejected...WTF?
Links to original (and informative) articles are Faulty capacitors and Passive Component Industry report.
In fairness most of the products affected carry a "Made in Tiawan" warning!
My older ABit board suffered the same fate a few days ago. I took a pic here.
I've got replacment capacators here now, gonna attempt a repair later today. I've never tried to fix a motherboard before, so should be fun!
Didn't they mean to say that "Leaking Capacitors Muck up Fotherboards"?
Basically anything that uses a switching power supply or a switching voltage regulator is at risk IMO. That covers most consumer and commercial equipment other than stuff that's physically too small to have one of these caps, or that handles only audio/radio.
However, I'm glad that this is happening to boards that end up in the hands of tech-savvy individuals that can spot the problem. People who buy ABIT, Asus, etc... boards expect a lot from the product that they recieve and are usuially knowledgeable about the equipment that they run.
I could only imagine if this happened to a major computer company, how it would be swept under the rug (which it may already have been). I see that IBM is named in the article, so at least they are willing to accept the failures. IBM is one of the only computer makers that I trust anymore after the way that they handled their hard drive failure issues. Yes, they tried to fix the problem by changing the uptime specs, but in the end, they got the problem worked out without too much hassle to customers (hardware zealots excluded).
I would like to know if this problem has been documented by any users that aren't using products from the manufacturers listed in the article and their expierence with the equipment, service and support.
I don't keep a lid on my coffee so when I walk around I look busy -me
High-Reliability motherboards don't use electrolytic capacitors for their onboard power supplies anyway. You'll only find these types on the typical built like crap (found in the majority of PC's built today)high volume motherboards. 5000 hour lifetime is what you'll find for typical ratings on low esr and long life electrolytic capacitors. This is only 200 days of continuous use.
High-Rel designs use very low esr tantalum caps. like these T530 Series
Quidquid latine dictum sit altum viditur
The issue with electrolytic capacitors is this:
All capacitors have what is called an equivelent series resistance, or ESR (great: now we have 2 TLAs that are overloaded in context: RMS and ESR... )
The ESR only matters when there is a current flow through the device - a static voltage does not create (much of ) a static current flow - that is rather the definition of a capacitor. So if you are putting a DC voltage across the device all is well.
However, if what you are putting across the device is NOT DC, but rather DC with an AC component on top of it, then there will be a current flow as the capacitor tries to hold the voltage constant (again, that's rather the point).
However, due to the ESR, some of that current will cause heating of the device (power = I*I*R).
In caps with the good electrolytic, nothing much happens. In caps with the bad electrolytic, the electrolytic breaks down into hydrogen and oxygen, as well as boiling into steam. Pressure builds, and eventually the cap leaks. Since the other stuff in the electrolytic is caustic, your PC board traces rot away.
Now, at low ripple currents, this does not happen very fast, and any cap will have a long lifespan. However, as you approach the limit of the cap, the heating becomes the dominant factor, and the cap will cook itself fairly quickly.
That's where that 4000 hours comes from - that is not the cap running with a few tens of milliamps of current ripple across it, that is the cap getting amperes of current rammed down its throat, and running very hot.
That's also why you use tantalum caps wherever possible - tant's don't have an electrolyte, they use a very spongy tantalum slug with lots of surface area. They don't have quite the capacitance per unit volume that electrolytics have, but they don't leak, either. (but they do blow up real good (sic) when you exceed their rated voltage!)
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