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Slightly Bulged Electrolytic Capacitor

By on October 23, 2008


I believe you have seen electrolytic capacitors that bulged in electronic board. If the bulged is too severe the top cap may split open and some of it has a big hump. The question is should we replace the e-cap if it has only a slight bulged? Not only that the slightly bulged electrolytic capacitor may be tested good using analog meter, digital capacitance meter and even ESR meter. The bulged cap just haven’t reach till it could cause problem yet.

If i see this kind of slightly bulged cap, i would not  test it with meters instead i will just directly replace it.The cap later on will surely develop problem either the hump will become bigger or it may cause intermittent problem. I just don’t want to take the risk of the equipment send back later by customer telling me that the equipment have problem again. I would like to solve it once and for all in order to prevent callback. For your information, callback from customer will only take up more of your time and you will not earn anything from the second repair.



  1. nagendra

    October 23, 2008 at 8:19 pm

    i want the circuit diagram of smps with output 10-50v

  2. admin

    October 23, 2008 at 9:59 pm

    Sorry i don't have such schematic diagram


  3. Paul Sulwer

    September 16, 2011 at 8:38 pm

    I agree with your article; I had a motherboard with a slightly bulging capacitor but wasn't leaking. I didn't even think it was bad and was just going to leave it, but noticed that every so often when I'd go to turn on the computer, I'd just get funny lines on the screen (sort of like the Matrix) until I reset the power. So I replaced the cap and it seemed to boot fine after that, although I haven't used it in awhile...


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