Connect with us

Popping capacitors Who has post 2006 hardware with bad caps?

Discussion in 'Electronic Repair' started by CheetahHugger, Oct 13, 2007.

Scroll to continue with content
  1. Just got 7 420W pc power supplies in which have all the same capacitor
    1000uf 16v popped, as these were made in 2006 i am suprised, that was a
    problem of the past or are there more people here that still have
    trouble with capacitors?
    Someone gave me 2 tft monitors which briefly show picture and then shut
    off, i open those tomorrow and see if they also have bad capacitors.
    I am aware of the motherboard capacitor problem but that too doesn't
    happen anymore or does it?
    Who sees post 2006 hardware with bad caps?

    Cheetah
     
  2. Marra

    Marra Guest

    Its maybe not the caps fault, maybe its a design fault ?
    Maybe someone has put in wrong voltage cap ?
    Maybe it cant cope with current surge at power up or later?

    http://www.ckp-railways.talktalk.net/pcbcad21.htm
     
  3. Arfa Daily

    Arfa Daily Guest

    Me, just about every day of my working life ...

    Arfa
     
  4. Hmmm.... I have a fairly new Samsung Syncmaster (something) 19" LCD on
    the bench with exactly the same problem. I'll start on it on Weds and
    see what I find.
    I'm not sure of the manufacturing date, but I've been seeing them in
    new +5/+12v external switching power supplies used on external USB to
    hard disk enclosures. I have a few torn apart and all have volcanic
    electrolytics.

    I haven't seen any recently in the usual places (motherboards, power
    supplies, and consumer electronics). I found a few in LCD panel power
    supplies, but they were much older than 2006. To find them, ESR
    meter, optical pyrometer, IR thermometer, or a really nifty IR
    thermography scanner that I borrow ocassionaly. I've tried using
    various digital cameras for IR and had no luck.
     
  5. JANA

    JANA Guest

    There is probably some other common fault that is causing the caps to be
    over stressed, or there is a design fault.

    Investigate things such as the working temperature of the supply, and if
    there is adequate air flow through it. Also, check the voltage across the
    cap while the supply is operating.

    For an experiment use a higher voltage rated cap and see what happens. If
    you can squeeze a 25V cap in its place, or find a way to use 2 X 470 uF /
    25V in parallel to replace if there is no space for a single at 1000 uF.
    Also, make sure that the cap's temperature is rated at 105 deg Cels.



    --

    JANA
    _____


    Just got 7 420W pc power supplies in which have all the same capacitor
    1000uf 16v popped, as these were made in 2006 i am suprised, that was a
    problem of the past or are there more people here that still have
    trouble with capacitors?
    Someone gave me 2 tft monitors which briefly show picture and then shut
    off, i open those tomorrow and see if they also have bad capacitors.
    I am aware of the motherboard capacitor problem but that too doesn't
    happen anymore or does it?
    Who sees post 2006 hardware with bad caps?

    Cheetah
     
  6. Eeyore

    Eeyore Guest

    Any particulat brands ?

    Graham
     
  7. Eeyore

    Eeyore Guest

    Were there never any 105C 'bad caps' ?

    Graham
     
  8. Yes, i can, it's just that i remember huge problems with capacitors
    about 10 years ago and it seems it's still a common failure making me
    think it's a weak component purposely installed to make sure the
    appliance in question will only just outlast the warranty.
    To me this is theft from consumers.

    Cheetah
     
  9. On my last 2 TFT monitors teapo and jackcon, on the power supplies it's
    tah-ken and fuhjyyu (fake fujitsu?).
    This is on Nec, Asus and Powermaxx power supplies from which i have 7
    with the same cap popped.
    This does look like a design fault so i will put a higher voltage cap in .

    Cheetah
     
  10. Arfa Daily

    Arfa Daily Guest

    Nope. The two main things that they always have in common, are that they are
    either secondary side filter caps on switchers, or located right next to a
    component that runs hot. SMPS designers seem to have something programmed
    into their genes, which compels them to do this ...

    Arfa
     
  11. Eeyore

    Eeyore Guest

    LOL ! I had a similar problem with a layout guy. He loved to crowd all the hot
    items together. In one case we even found that a certain power diode would after
    extended operation virtually 'weld' itself into the tiny PTH he'd provided it
    with.

    Graham
     
  12. robb

    robb Guest

    i think you need to factor in the product value and penny
    counters as well, Cheapo mother boards were big problem once upon
    a time. The mother board and other electronic mfgs are ordering
    thousands and millions of components and a couple of fractions of
    pennies here and there really adds up to big savings or profit
    for them. I replaced some buldging caps in my old cheapie MOBO
    with nichicon equivalents and the board still runs great.
     
  13. Arfa Daily

    Arfa Daily Guest

    That said, there was a genuine issue a few years back where one (or more ??)
    of the major electrolytic manufacturers had a batch of 'fake' electrolyte
    swung across them, which resulted in hundreds of thousands of substandard
    caps appearing on the market, and finding their way onto computer
    motherboards, and failing after a relatively short period of time.
    Obviously, the mo-bo manufacturers thought that they were buying full spec
    caps, and the cap manufacturers thought that's what they were selling, so
    not a penny-pinching situation in that case.

    Arfa
     
  14. Meat Plow

    Meat Plow Guest

    IIRC Abit was one mobo manufacture that got bit by bad caps.
     
  15. Eeyore

    Eeyore Guest

    Yes. Still not sure if it was that or a dodgy PSU of the same era that gave me
    trouble.

    Graham
     
  16. Guest

    I have one of those Abits. I tried to replace them but the local elctronics
    dealer(central Canada) wanted $40.00 for 20 caps. (I could replace the MoBo for
    that price, its outdated anyway and I just wanted to try replacing the caps for
    the heck of it). I am waiting to find a more reasonable seller with decent prices.
     
  17. Yeah,

    But i am currently looking over a pile of scrapped items i took from a
    local computer shop, including about 50 power supplies and 2 tft
    monitors, and several complete computers fairly late, amd athlon mainly,
    who have all in common that they are discarded because of bad caps.
    The problem the previous poster mentioned is true here as well, they
    want up to 1 euro for just 1 capacitor, so i solve that by salvaging
    dead mainboards for their caps to replace the bulged ones.
    Unless someone knows a good supplier for 105° caps suitable for computer
    who has no objection to ship to or is located in europe.
    Any suggestions, i would like 1000 or such of each common number.

    Cheetah
     
  18. Ron(UK)

    Ron(UK) Guest


    Rapid Electronics
    http://www.rapidonline.com
    I believe that they will ship to mainland Europe


    Ron(UK)
     
  19. I bought a bag of 30 1500 µF 6.3V nichicon 105° caps from China on
    Ebay. The caps were $10.99 and shipping to Sweden $5.99.

    Here is one such auction:
    http://cgi.ebay.com/1500-uf-6-3v-10...oryZ1244QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

    They shipped quickly, ~1 week, and the price is very reasonable.

    I have no affiliation with them, other than I'm a happy customer.

    I have also bought LED:s from another chinese vendor, and I'm very
    happy with these as well.
     
  20. Guest

    Thanks for the info. Sounds like reasonable prices. I will give them a call.

    regards
    hg
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-