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About Capacitance Value

By on November 9, 2010

There are many different types of capacitors in the market like the mica, ceramic, electrolytic, tantalum and etc. Different types of capacitor have difference tolerance value. In order to avoid the confusion of what is the tolerance value of each type of capacitor, i would just use minus 10% as a guideline. For example, if the non polarity capacitor have the value of 1 nano farad (nf) then this mean when we test the capacitor, the value should not go below 0.9 nf otherwise we have to replace the cap. Even if the cap is in the borderline (say 0.9 or 0.91nf) , i would still replace it because i believe the cap value will continues to drop after few months time.

For electrolytic capacitor, we can use the ESR meter thus not necessary to know about the capacitance value although there are some rare cases where the ESR check to be okay but the capacitance value were out.

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7 Comments

  1. clinton downer

    November 9, 2010 at 4:37 pm

    Your suggestions on DVD repair is very helpful. However, I have a DVD in my shop that is still giving the same error- no disc dispite the fact that all the above mention problems are sorted out. There is an additional problem though- only the STOP/EJECT key gives response. Can you suggest what is the possible cause?

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  2. Selby Isoroembo

    November 9, 2010 at 9:21 pm

    Hi, Justine
    I like this website I am frequintly visiting your websit also read every thing that on this web,I like elotronic and Iam Computer Tech I pick up Hints on this site and also Love to have some of this Books you have on Display on the right side of screen.
    Please can you send me price list of these Books.

    Thank you and well done.
    Selby Isoroembo,PNG

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  3. admin

    November 10, 2010 at 5:28 am

    HI Selby,

    I've already sent an email to you.

    Jestine

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  4. admin

    November 10, 2010 at 9:24 am

    HI Clinton,

    If it still have problem then you may need to replace the lens/or the assembly. In your case, when you said only the buttons working normally then most probably the mainboard have problem that had caused the error. Mainboard problem is one of the hardest to detect due to lack of parts availability and repair information in the internet.

    Jestine

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  5. Bernard

    November 11, 2010 at 8:20 am

    Hi Jestine,

    Talking about capacitors, my nephew told me that some capacitors from China doesn't have the right uf readings. 2 new capacitors was blown up. After checking through the fault is with the capacitor written on it is 470uf , but actually testing with ESR it's readings is 900uf ++. So it's better to check first with ESR before fixing it up ( All new capacitors )The capacitor is dark brown color type.

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  6. admin

    November 11, 2010 at 10:10 am

    HI Bernard,

    Yes, those low quality caps could have problem. It will blow the first time you turn on the set.

    Jestine

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  7. leonard williams

    November 16, 2010 at 1:38 pm

    mr young ihave a ecg capacance tester that work wery well i alwayse check to see that the caps are above the normal reading

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