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Yageo 400V 680uF measuring 580uF

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    #1

    Yageo 400V 680uF measuring 580uF

    Hi,
    I have a Yageo 400V 680uF that is currently measuring 580uF (Measured by UNI-T UT603). Does that normally qualify for replacement?
    Details: Siemens tumble dryer getting Error 25 after an hour or so, on all last 3 runs.
    I checked the circuit boards quickly and this capacitor sticks out, nothing visible, not even bulging though. It costs 12euro, so I'd like to get your feedback first. The main thing on that board seems to be a motor controller (for the compressor) https://www.mouser.sk/ProductDetail/...xvzUNHBQ%3D%3D.
    Thanks
    Daniel
    Tags: None
    #2
    Whats the esr like on the cap?

    Comment

      #3
      I don't have that kind of equipment, sorry.

      Comment

        #4
        Electrolytic capacitors, typically, are +/-20%, so on the low end the cap can be as low 544uF.
        PeteS in CA

        Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
        ****************************
        To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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        Comment

          #5
          ok I got me an ESR tester and that cap shows 0.33ohm.

          Comment

            #6
            Originally posted by slybunda View Post
            Whats the esr like on the cap?
            ESR is 0.33ohm, what do you think?

            Comment

              #7
              Check with the datasheet for that cap to see how it stacks up.

              Comment

                #8
                Originally posted by slybunda View Post
                Check with the datasheet for that cap to see how it stacks up.
                Easier said than done, . Mine has a sticker with what looks like a Bosh part number (BSH 9000558676), but I couldn't find any more details on that.
                I'm attaching a photo in case it would help.
                I only found one similar on web, not sure it's identical and the data sheet doesn't specify ESR: https://static6.arrow.com/aropdfconv...an_lv_2011.pdf
                Any opinion welcome.
                Attached Files

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                  #9
                  look for . yageo lg series datasheet

                  Comment

                    #10
                    http://www.paullinebarger.net/DS/Yag...G%20Series.pdf

                    Comment

                      #11
                      Thanks guys, that indeed looks like what I have. However, I don't see ESR value in that data sheet.

                      Comment

                        #12
                        https://il.farnell.com/epcos/b43511a...-in/dp/3437421

                        This one has esr of 0.14

                        Comment

                          #13
                          I switched the capacitor for a new one but that didn't solve it. Next up is likely the main invertor chip IKCS17F60F2A, but I'm not 100% sure, not even 51%. I guess it could still be the compressor leakage. The chip is 16.3eur on Ali, I guess I will try that. The whole invertor board is 335eur as original Siemens spare part.

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