DLink using bad caps?
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Posted by Eric on March 21, 2008, 8:32 pm
Please log in for more thread options As I recently posted, one of my main wireless routers (DI-764 802.11a/b) finally died completetly after six years of use. The 802.11a radio had died a few months back, but by then I was only using the router portion of the DI-764 as I had a WAP (DWL-7100AP 802.11a/gb) attached to it. I've since ordered a wired router to replace the old DI-764 (waiting on it to arrive from Newegg), but thought I would play around with the old DI-764 and see if I could actually fix the thing. Upon opening it up, I noticed that one cap had completely bursted while another one was buldging. First trip to a Radio Shack proved fruitless as that particular store (at a mall) no longer sold components. The sales clerk didn't even know what a capacitor was. She kept asking me if it was some sort of interconnect! Anyway, today while lunch at work, I went to a regular Radio Shack and got new caps. I then soldered the new caps onto the mainboard and the DI-764, to me disbelief, was fully operational again! Once I got home, I decided to look into another D-Link WAP that I have since it has just started acting a little flakey. Sure enough, one of the caps inside it is starting to buldge. This particular WAP has only been running for a little over a year. Ok, I guess I shouldn't really complain about six years of 24/7 operation, but should they be crapping out after only a year? Is D-Link saving a few pennies by using poor quality caps? | |||||||||||||||||||
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Posted by on March 22, 2008, 2:18 am
Please log in for more thread options If you could photograph the bad caps and where they were located, upload the photo, then readers at sci.electronics.design could diagnose the problem. I do salute your effort to fix the problem. | |||||||||||||||||||
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Posted by Eric on March 22, 2008, 1:52 pm
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>> Hi,
>> >> As I recently posted, one of my main wireless routers (DI-764 802.11a/b) >> finally died completetly after six years of use. The 802.11a radio had >> died >> a few months back, but by then I was only using the router portion of the >> DI-764 as I had a WAP (DWL-7100AP 802.11a/gb) attached to it. >> >> I've since ordered a wired router to replace the old DI-764 (waiting on >> it >> to arrive from Newegg), but thought I would play around with the old >> DI-764 >> and see if I could actually fix the thing. Upon opening it up, I noticed >> that one cap had completely bursted while another one was buldging. >> First >> trip to a Radio Shack proved fruitless as that particular store (at a >> mall) >> no longer sold components. The sales clerk didn't even know what a >> capacitor was. She kept asking me if it was some sort of interconnect! >> >> Anyway, today while lunch at work, I went to a regular Radio Shack and >> got >> new caps. I then soldered the new caps onto the mainboard and the >> DI-764, >> to me disbelief, was fully operational again! >> >> Once I got home, I decided to look into another D-Link WAP that I have >> since >> it has just started acting a little flakey. Sure enough, one of the caps >> inside it is starting to buldge. This particular WAP has only been >> running >> for a little over a year. >> >> Ok, I guess I shouldn't really complain about six years of 24/7 >> operation, >> but should they be crapping out after only a year? Is D-Link saving a >> few >> pennies by using poor quality caps? >
> If you could photograph the bad caps and where they were located, > upload the photo, then readers at sci.electronics.design could > diagnose the problem. > > I do salute your effort to fix the problem. Hi, Didn't even think of that... The bad caps have already made their way to a dumpster... | |||||||||||||||||||
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Posted by Jeff Liebermann on March 22, 2008, 12:18 pm
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>Ok, I guess I shouldn't really complain about six years of 24/7 operation,
>but should they be crapping out after only a year? Is D-Link saving a few >pennies by using poor quality caps? No, it's not really D-Links fault. Since about 1999, the entire industry has been plagued by defective low-ESR electrolytic capacitors with counterfeit electrolyte. <http://en.wikipedia.org/wiki/Capacitor_plague>
The problem has been that there are so many defective capacitors in
<http://www.badcaps.net/> circulation, that they end up in current products. Also, the delay before they blow up varies with temperature and loading. A very hot and high rippple current capacitor on a PC motherboard may blow up in a few weeks, while the same capacitor, in a light duty and cooler product, might take years. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 | |||||||||||||||||||
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Posted by Eric on March 22, 2008, 1:50 pm
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>
>>Ok, I guess I shouldn't really complain about six years of 24/7 operation,
>>but should they be crapping out after only a year? Is D-Link saving a few >>pennies by using poor quality caps? >
> No, it's not really D-Links fault. Since about 1999, the entire > industry has been plagued by defective low-ESR electrolytic capacitors > with counterfeit electrolyte. > <http://en.wikipedia.org/wiki/Capacitor_plague> > <http://www.badcaps.net/> > The problem has been that there are so many defective capacitors in > circulation, that they end up in current products. Also, the delay > before they blow up varies with temperature and loading. A very hot > and high rippple current capacitor on a PC motherboard may blow up in > a few weeks, while the same capacitor, in a light duty and cooler > product, might take years. > Hi, Wow. I remember when computer motherboards were having problems with bad caps, but didn't realize it was so broad.... | |||||||||||||||||||
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>
> As I recently posted, one of my main wireless routers (DI-764 802.11a/b)
> finally died completetly after six years of use. The 802.11a radio had died
> a few months back, but by then I was only using the router portion of the
> DI-764 as I had a WAP (DWL-7100AP 802.11a/gb) attached to it.
>
> I've since ordered a wired router to replace the old DI-764 (waiting on it
> to arrive from Newegg), but thought I would play around with the old DI-764
> and see if I could actually fix the thing. Upon opening it up, I noticed
> that one cap had completely bursted while another one was buldging. First
> trip to a Radio Shack proved fruitless as that particular store (at a mall)
> no longer sold components. The sales clerk didn't even know what a
> capacitor was. She kept asking me if it was some sort of interconnect!
>
> Anyway, today while lunch at work, I went to a regular Radio Shack and got
> new caps. I then soldered the new caps onto the mainboard and the DI-764,
> to me disbelief, was fully operational again!
>
> Once I got home, I decided to look into another D-Link WAP that I have since
> it has just started acting a little flakey. Sure enough, one of the caps
> inside it is starting to buldge. This particular WAP has only been running
> for a little over a year.
>
> Ok, I guess I shouldn't really complain about six years of 24/7 operation,
> but should they be crapping out after only a year? Is D-Link saving a few
> pennies by using poor quality caps?