Capacitor Replacement

By on March 14, 2010

ecaps

Now, whenever you  could not find the exact voltage of the capacitor from electronic shops, you can always use a higher than the original rated voltage of capacitor for replacement. The best suggestion that i can give you is to use a next voltage level. For example, the capacitor rated voltage ranges that can be found in the market are 6.3v, 10v, 16 v, 25 v, 35v, 50v, 63v, 100, 160, 200v, 250v, 350v, 400v, 450v and etc. If you want to find replacement for the 25volt range cap then use the 35 volt. Of course you can use 50 or even 100volt but do you know that the higher the voltage of the cap, the higher the price? The capacitor price is not base on the capacitance value!

Well, you can use the 160v or even 250 volt range but it is not practical. The price is expensive and there will be no room/space for you to insert the cap. You may have to modify and use longer wires to fit in the big cap and this will look ugly. Generally the higher the cap voltage, the bigger is the capacitor size. Sometimes it depends on the manufacturers too. I came across capacitor that was rated 50 volt that have smaller size than a 25 volt cap!

Actually finding cap for replacement is not an issue, if the replacement cap can fit well into the original place then your job is considered done. This post is not for only electrolytic capacitors, it can be used for the non polar caps as well.

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32 Comments

  1. Big Ben

    March 14, 2010 at 9:54 am

    hi mr Yong,i have a 3 monitor with a strange problem i never seen before.
    first is belinea 1905s1 ,green led blinking and fall in standby mode, some sound is hear from transformer after fall in standby mode.
    Second monitor is samsung 923bf ,When i plug it first time into wall outlet monitor works fine,after unplug and plug again monitor start and turn off the lamps. and third is a samsung too,after monitor start turn off the lamps after few seconds.

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  2. Delroy

    March 15, 2010 at 1:45 am

    Hello Justin,your Electronic information that you share is so refreshing, i can't get enough.You are an inspiration to me.
    Thanks a million times and may the good Lord bless you always.

    Delroy Edwards, Jamaica.

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  3. admin

    March 15, 2010 at 11:30 am

    HI Delroy,

    You are welcome!

    Jestine

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  4. admin

    March 16, 2010 at 1:40 am

    HI Big,

    Is the first monitor output voltages from the SMPS stable? For the second and third monitor, you may need to check the filter cap (bulged) and also the back lamp. A bad backlight could cause it to shutdown.

    Jestine

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  5. BIG BEN

    March 16, 2010 at 12:08 pm

    Yes on the first monitor voltage is stable,in second and third capacitors is good and backlights is good,but no voltage from backligt output connector,but if i disconnect inventer board from second monitor sound from transformator not exist.on third monitor the buttons not work just light work.

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  6. admin

    March 17, 2010 at 9:23 am

    HI Big,

    Green led blinking with stable voltage could be a sign of CPU failure. Make sure the h/v signal is connected and are reaching the cpu. Make sure also the cpu is receiving stable 5 volt.

    for the second and third monitor, is there supply voltage to the inverter ic when the monitor is not working?

    Jestine

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  7. BIG BEN

    March 18, 2010 at 7:20 am

    hi mr Yong,on belinea i tried to change all component and it not solved the problem,i think problem is in a mcu or some smd components,
    i change the smps board and it works fine,now about samsung 923bf,i test it without metal case and it works fine,after that i back it in metal case without a one central plastic screw and it works fine,but on a third monitor porblem still exist,14 volt is not stable ,i tried to test diodes after transformer and it show 33 volts,after that diodes is two capacitors and a connector for mainboard, on first two monitor problem is litle confused but on third...

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  8. admin

    March 18, 2010 at 9:36 am

    Hi Big,

    Okay the first two monitors already solved. But on the third one is the output voltages not stable. Only one output not stable or all of the output?

    Jestine

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  9. BIG BEN

    March 18, 2010 at 12:47 pm

    Hi mr Yong .Output on connector for mainboard is not stable,14 voltage is not stable,other voltages is stable , but sound from monitor is like a arcing and turn of the lamps, after that sound disapear

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  10. Jomar

    March 21, 2010 at 2:41 am

    mr. yong,

    I have come accross a power supply section of a dvd player with a large voltage capacitor that has a glue-like yellowish color beside it. is it an indication that the capacitor is leaking? or it is really a glue. Only one capacitor have a glue-like on it. other capacitor sorrounding it doesnt have it. my dvd will sometimes hang up during long hours of operation. please advice. thank you.

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  11. admin

    March 21, 2010 at 11:11 am

    HI Big,

    If the 14 volt is not stable then you should concentrate on this line. It could be a bad cap or bad output diode. Sometimes bad components in the 14 volt line in the motherboard could cause such problem.

    Jestine

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  12. admin

    March 21, 2010 at 11:15 am

    Hi Jomar,

    Those are silicone glue to secure the capacitor from vibration during shipping and etc. Make sure all output voltages from the SMPS are good and stable.

    Jestine

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  13. BIG BEN

    March 25, 2010 at 6:12 am

    Hi mr Yong,I changed smps transformer and problem still exist,but is little different,i press power button monitor turn on normali,and sound appear, picture start to vibrating,and turn of the monitor,

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  14. BIG BEN

    March 25, 2010 at 6:15 am

    and yes i forgott,voltage is now stable

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  15. admin

    March 25, 2010 at 8:51 am

    HI Big,

    When you said now the voltage is already stable, so is the monitor still have problem?

    Jestine

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  16. BIG BEN

    March 25, 2010 at 9:43 am

    jes it have,start normali,after few seconds sound apear from transformer,picture start to vibrating and turn it off,maybe is someting before transformer?

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  17. admin

    March 25, 2010 at 9:52 am

    HI Big,

    Well, it can be components that breakdown when under load. It can be in the primary or in the secondary side. Start to replace the semiconductor and retest the set. If you have the freezer/coolant then it will be really helpful.

    Jestine

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  18. Kim Hock

    June 5, 2010 at 10:36 am

    Hi jestine,

    I face a problem in a 12v 80w ac adapter output filter capacitor, it got 3 pcs 1000uF, 680uF, 330uF 25v 105c brand samxon. After 1 year starting bulge, output voltage drop under load. I replace it with panasonic cap with same value, voltage & temperature rating, it work around 1 year & starting bulge again,some of it primary filter capacitor 68uF 450v 105c samxon also starting fail with no value & cause the primary side multiple component fail(PWM, resistor, zener diode, circuit track burn). Firstly i suspect the temperature ac adapter too high cause it cap bulged, after i measure the adapter internal temperature in a room without fan & air-con the maximun temperature reach 68c, but the cap temperature 105c it should be ok. 2nd i suspect the cap quality problem but even i chance it with panasonic brand also cant last longer. In ur experience what do you suspect & what should i do to prevent this capacitor fail again?

    Thank you.

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  19. admin

    June 5, 2010 at 11:30 pm

    HI Kim hock,

    Try use another brand with slightly higher voltage. For example, use 35 volt cap instead of 25 volt.

    Jestine

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  20. manjunath

    June 6, 2010 at 3:20 pm

    hi jestine,

    i am regular reader fo your monthly newsletters, i would like to know, can i suggest high voltage caps for low voltage caps, if i am suggesting a cross for caps, for example can i suggest 35 volts cap in place of 25 v, which is already being used in teh board? will it affect the application or functionality?

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  21. admin

    June 7, 2010 at 4:49 am

    HI Manjunath,

    You need to replace cap that have higher voltage otherwise the cap my blow if you replace it with lower than original value.

    Jestine

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  22. jay

    May 20, 2012 at 2:43 am

    hi jestine,
    i have dell 22" lcd that blown capasitor 68uF 450V.
    Can i change it with capasitor 150uF 450V

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    • Jestine Yong

      May 21, 2012 at 8:44 am

      Hi jay,

      Yes you can if there is enough space for it to be fitted.

      Jestine

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  23. jay

    May 23, 2012 at 2:33 am

    is it safe if i change it? cause i cant find the 68uF 450V capacitor.. thx btw the capasitor at the power board

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    • Jestine Yong

      May 27, 2012 at 4:03 am

      HI Jay,

      Yes you can it provides better filtering. I have cap running at 150uf and I fitted it with a 330uf.

      Jestine

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  24. leechimming

    August 15, 2012 at 10:05 pm

    nice post 🙂 thnx !!

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  25. Rex

    January 18, 2017 at 8:15 pm

    Hi i hv a power supply of led parcan da capacitor is blow off its rating is 82uf 400v cn i replceit with 68uf 400v

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    • Jestine Yong

      January 18, 2017 at 8:22 pm

      Hi Rex,

      The rule is to replace with the same or higher microfarad. If you put in a lower cap value, it may still run but not for long.

      Jestine

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  26. Justin Odey

    April 28, 2017 at 4:47 am

    hi jestine, can i connect two 470uf 50v capacitors in series in the absense of 470uf 100v that was originally used?

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    • Jestine Yong

      May 2, 2017 at 11:01 am

      Hi Justin,

      Please visit this link : http://www.electronicrepairguide.com/series-and-parallel-capacitors.html

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  27. Lawal

    December 7, 2017 at 12:14 am

    Pls i 2 capacitors to replace but can't find the exact ratings,45v/33uf and 450v/120uf.which rating can I use in place of them

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    • Jestine Yong

      December 7, 2017 at 10:06 am

      Hi Lawal,

      You can use 63 volt/33uf and 450 volt 150uf or 180uf.

      Jestine

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