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How far off value do you let a cap go?

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    #1

    How far off value do you let a cap go?

    Simple thoughts here, how far off of a cap's marked value do you let a cap get to before considering replacement?

    Me, I let it go no more than 50-55uF below value. Example is a 25" Magnavox TV/DVD/VCR combo unit that was handed to me for repairs, with a squealing power supply and no life. So far, found three caps that I considered useless:

    Cap 1: 1000uF/16V - Tested out at 799uF
    Cap 2: 1000uF/16V - Tested out at 843uF
    Cap 3: 2200uF/6.3V - Tested out at 1730uF
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    #2
    Re: How far off value do you let a cap go?

    Caps have a tollerance code printed on them as in (M) = 20%
    Best to keep within the caps tollerance or considerably less, I would have thought, should be safe enough

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      #3
      Re: How far off value do you let a cap go?

      If the caps are in the SMPS/PSU side, then measuring ESR is required to see if they are within spec in addition to capacitance.
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        #4
        Re: How far off value do you let a cap go?

        Trying to not use them under 70 % of specified value.
        Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts

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