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    Bad cap reading 4x high?

    I have a swollen Sanyo WG 2200uf cap removed from the board and reading 8000uf with an LCR meter and a DMM. I always thought bad caps capacitance goes way down when swollen or leaking.
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    #2
    Re: Bad cap reading 4x high?

    What resistance do you get when tested it in Ohm mode? What ESR do you get when tested with ESR meter?
    Never stop learning
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      #3
      Re: Bad cap reading 4x high?

      high leakage does that.

      Comment


        #4
        Re: Bad cap reading 4x high?

        Originally posted by budm View Post
        What resistance do you get when tested it in Ohm mode? What ESR do you get when tested with ESR meter?
        Starts around 1k ohms then climbs and climbs then, in a split second, goes up to 30k.

        Attached Files
        Last edited by Per Hansson; 02-24-2018, 09:00 AM. Reason: Offsite image uploaded
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        Ryzen 3600x
        16GB Patriot 3600MHz
        MSI B450 Gaming Plus
        MSI Air Boost Vega 56
        Acer 32" 1440P Freesync
        Rosewill Capstone 750W
        --------------------------------------------------------------
        Hakko FX-888D Station
        FX-8802 Iron
        MG Chem .8mm 63/37 RA 2.2%

        Comment


          #5
          Re: Bad cap reading 4x high?

          I've seen some LCR meters report incorrect numbers on leaky capacitors. The number is wrong.

          Comment


            #6
            Re: Bad cap reading 4x high?

            First off the ESR 0.24 ohms is a give away any way

            It should be .02 anyway and the UF reading is way off to
            9 PC LCD Monitor
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            These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

            1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
            2 Hem Saw Computer Stack Board

            All of these had CAPs POOF
            All of the mosfet that are taken out by bad caps

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              #7
              Re: Bad cap reading 4x high?

              Originally posted by sam_sam_sam View Post
              First off the ESR 0.24 ohms is a give away any way

              It should be .02 anyway and the UF reading is way off to
              I'm not too sure about the ESR accuracy on that cheap test kit. I have thrown brand new low esr caps in there and it's shown way too high esr as well.

              Here is an example. Brand new 1000uf Panasonic FM

              Attached Files
              Last edited by Per Hansson; 02-24-2018, 09:01 AM. Reason: Offsite image uploaded
              --------------------------------------------------------------
              Ryzen 3600x
              16GB Patriot 3600MHz
              MSI B450 Gaming Plus
              MSI Air Boost Vega 56
              Acer 32" 1440P Freesync
              Rosewill Capstone 750W
              --------------------------------------------------------------
              Hakko FX-888D Station
              FX-8802 Iron
              MG Chem .8mm 63/37 RA 2.2%

              Comment


                #8
                Re: Bad cap reading 4x high?

                they are very accurate if they are calibrated.

                Comment


                  #9
                  Re: Bad cap reading 4x high?

                  Originally posted by jayjr1105 View Post
                  IBrand new 1000uf Panasonic FM
                  Electrolytic caps are usually +/- 20% of their uF rating. So a 1000uF cap reading 1048uF is okay.

                  The ESR might be a bit high depending on which exact 1000uF cap you have. Check it against

                  https://cdn.badcaps-static.com/pdfs/...404c12c252.pdf
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                    #10
                    Re: Bad cap reading 4x high?

                    Originally posted by stj View Post
                    they are very accurate if they are calibrated.
                    I just ordered a .1uf cap to calibrate it. I don't have anything close sadly.

                    Originally posted by retiredcaps View Post
                    Electrolytic caps are usually +/- 20% of their uF rating. So a 1000uF cap reading 1048uF is okay.

                    The ESR might be a bit high depending on which exact 1000uF cap you have. Check it against

                    https://cdn.badcaps-static.com/pdfs/...404c12c252.pdf
                    I didn't mean the capacitance. I meant the ESR is way too high for a brand new low ESR cap.
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                    Ryzen 3600x
                    16GB Patriot 3600MHz
                    MSI B450 Gaming Plus
                    MSI Air Boost Vega 56
                    Acer 32" 1440P Freesync
                    Rosewill Capstone 750W
                    --------------------------------------------------------------
                    Hakko FX-888D Station
                    FX-8802 Iron
                    MG Chem .8mm 63/37 RA 2.2%

                    Comment


                      #11
                      Re: Bad cap reading 4x high?

                      Originally posted by retiredcaps View Post
                      Electrolytic caps are usually +/- 20% of their uF rating. So a 1000uF cap reading 1048uF is okay.
                      Yes, smaller ones are usually a bit over that.

                      Bigger ones (=High Voltage) usually are a bit under the specified value.

                      ie for a 470uF capacitor you can assume something around 440uF or something like that...

                      Comment


                        #12
                        Re: Bad cap reading 4x high?

                        i recommend a 0.22uf film cap for calibrating.

                        if a .1uf cap is actually 0.099uf the tester wont like it.

                        Comment


                          #13
                          Re: Bad cap reading 4x high?

                          It looks like the leakage resistance causes the fault capacitance reading.
                          If you put 100K, 47K resistor in parallel with that Panasonic cap, what will it show on your cap meter?
                          Last edited by budm; 02-19-2018, 06:56 PM.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

                          Inverter testing using old CFL:
                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                          http://s807.photobucket.com/user/budm/library/

                          TV Factory reset codes listing:
                          http://www.badcaps.net/forum/showthread.php?t=24809

                          Comment


                            #14
                            Re: Bad cap reading 4x high?

                            Originally posted by stj View Post
                            i recommend a 0.22uf film cap for calibrating.

                            if a .1uf cap is actually 0.099uf the tester wont like it.
                            Figures, I knew I should have just ordered a kit like this. http://a.co/3KgqGtE

                            Do you think my ESR readings will improve that much once calibrated? I have tested a ton of low esr caps, never once seeing anything .0X or lower. I thought that LCR tester is just junk.

                            Edit: I can put two .1uf's in parallel can't I?
                            Last edited by jayjr1105; 02-19-2018, 07:46 PM.
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                            Ryzen 3600x
                            16GB Patriot 3600MHz
                            MSI B450 Gaming Plus
                            MSI Air Boost Vega 56
                            Acer 32" 1440P Freesync
                            Rosewill Capstone 750W
                            --------------------------------------------------------------
                            Hakko FX-888D Station
                            FX-8802 Iron
                            MG Chem .8mm 63/37 RA 2.2%

                            Comment


                              #15
                              Re: Bad cap reading 4x high?

                              the parallel method should work.

                              you should read my very long tester thread!!
                              https://www.badcaps.net/forum/showthread.php?t=50720

                              Comment


                                #16
                                Re: Bad cap reading 4x high?

                                Originally posted by stj View Post
                                they are very accurate if they are calibrated.
                                LCR-T4 versus BK 880
                                https://streamable.com/acx9m
                                Attached Files
                                The art of fighting without fighting

                                Comment


                                  #17
                                  Re: Bad cap reading 4x high?

                                  1-6-4 Temperature Characteristics

                                  Aluminum electrolytic capacitors have liquid electrolyte. This electrolyte has properties (conductivity, viscosity, etc.) that have rather conspicuous temperature characteristics.

                                  Electrical conductivity increases as the temperature increases and reduces as the temperature decreases.

                                  Therefore, the electrical characteristics of aluminum electrolytics are affected by temperature more than other types of capacitors. The following section explains the relationship between temperature and capacitance, tangent delta, ESR, impedance and leakage current.



                                  1) Capacitance The capacitance of aluminum electrolytic capacitors increases as the temperature increases and decreases as the temperature decreases. The relationship between temperature and capacitance is shown in Fig. 1-9.



                                  2) Tanδ, Equivalent Series Resistance (ESR), Impedance The Tanδ, equivalent series resistance (ESR) and impedance changes with temperature and frequency. An example of the general characteristics is shown in Fig. 1- 10 and 1-11.



                                  The art of fighting without fighting

                                  Comment


                                    #18
                                    Re: Bad cap reading 4x high?

                                    https://www.youtube.com/watch?v=vzoDurlg_jI
                                    The art of fighting without fighting

                                    Comment


                                      #19
                                      Re: Bad cap reading 4x high?

                                      Originally posted by victor_cj View Post
                                      LCR-T4 versus BK 880
                                      https://streamable.com/acx9m
                                      I have never from day 1 of owning the LCR-T4 seen a cap ESR that low. Even with brand new caps. I wonder if there's firmware or something to update. I still have some caps coming tomorrow for calibration.
                                      --------------------------------------------------------------
                                      Ryzen 3600x
                                      16GB Patriot 3600MHz
                                      MSI B450 Gaming Plus
                                      MSI Air Boost Vega 56
                                      Acer 32" 1440P Freesync
                                      Rosewill Capstone 750W
                                      --------------------------------------------------------------
                                      Hakko FX-888D Station
                                      FX-8802 Iron
                                      MG Chem .8mm 63/37 RA 2.2%

                                      Comment


                                        #20
                                        Re: Bad cap reading 4x high?

                                        >0.1uF capacitor for calibration is the reference, Rp and Rs may make a difference.
                                        On the LCR-T4 PCB, 431(TL431) is the reference for ATMEGA328P-AU.
                                        Attached Files
                                        Last edited by victor_cj; 02-22-2018, 02:30 AM.
                                        The art of fighting without fighting

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