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Dyson V6 Absolute Not Starting

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    Dyson V6 Absolute Not Starting

    Hi everybody,

    I bought one of these and the batteries are a disaster with them. I have a second dud battery now and I'm just about to throw the thing in the bin.

    The battery is rated 21.6V and supplies up to 16A. I connected two 12V lead acid batteries in series to test the motor - the dyson starts and then stops after two seconds. I'm not sure why, maybe it is the overvoltage protection or maybe the batteries can't supply the required current.

    I'm just wondering if I put two lead acid car batteries (which would have the required current capacity) in series for 24V, drop down to 21.6V using high current diodes (in case the 24V is too much), would it do the job? Has anybody toyed around with powering with an alternative power source? Obviously I would have to carry around the car batteries but I would just put together a Ghostbusters type carry bag, so this would not be an issue.

    #2
    Re: Dyson V6 Absolute Not Starting

    If you have some 20 volt tool battery packs you could test this device I would caution you that these type of battery pack have a certain amount of current that you pull from the BMS protection board so be aware of this limitation

    3 to 5 amps is the normal range higher preforms tools range is about 5 to 8 amps

    Impact gun ,die grinder , grinder would fall in the 5 to 8 amp range

    Drill driver 1/4 impact gun regulator drill fall in the 3 to 5 amp range

    One other caution you should be aware of is that some battery packs do have have BMS protection boards they are part of the charger and the tool has a voltage/current monitor circuit

    You can sometimes tell if this is the case it will have each battery cell voltage can be measured on the connector pins if this is the case do NOT use this type of battery pack to test your device in question you will no current protection for the batteries in the pack

    The other option is to replace the defective batteries with good ones and try retesting them if you do this remember that you have to reactive the battery pack by putting it on the charger before you can test the device

    I would have to agree with you suspicion that it might over voltage detection circuit which would not surprise me in the least

    If you have two battery packs you might get lucky and have enough good batteries out two battery packs to make a good one for awhile

    Do you know what size batteries they 18650 , 21650 and so on

    I hope this helps you with this type of repair
    Last edited by sam_sam_sam; 07-09-2022, 06:54 AM.
    9 PC LCD Monitor
    6 LCD Flat Screen TV
    30 Desk Top Switching Power Supply
    10 Battery Charger Switching Power Supply for Power Tool
    6 18v Lithium Battery Power Boards for Tool Battery Packs
    1 XBox 360 Switching Power Supply and M Board
    25 Servo Drives 220/460 3 Phase
    6 De-soldering Station Switching Power Supply 1 Power Supply
    1 Dell Mother Board
    15 Computer Power Supply
    1 HP Printer Supply & Control Board * lighting finished it *


    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

    Comment


      #3
      Re: Dyson V6 Absolute Not Starting



      Hi Sam,

      Thanks for your reply. I have drawn up a quick electronic diagram of what I'm proposing. To be honest I expected to look up youtube and find someone who had done similar, or at least a good reason why it could not be done. But I will put the circuit up there for somebody to critique. Maybe the dyson battery module also provides regulation or preparation of the voltage before it is fed to the dyson itself.

      I'm pretty sure they use the 18650 batteries, and I have a good few spares of these in old laptop batteries. But I think the issue with the Dyson battery module is more that the electronics around the battery fail, not that the cells themselves fail. This is another option for something that I could try though.
      Attached Files
      Last edited by VitalComputing; 07-09-2022, 07:37 AM.

      Comment


        #4
        Re: Dyson V6 Absolute Not Starting

        I would add one more diode for good measure first if it works correctly with this then you could remove the extra one and see if the circuit like this situation

        You could do this but I would at least use 3 amp diodes for this test so you do short them out
        I would not continuously run it on this setup unless you use 10 amp diodes at a minimum just to be on the safe side

        One thing I would recommend that you load test the 18650 cells with a automotive type headlight and record the time that the voltage is above 3.0 but make sure that you start with a fully charged battery 4.2 maximum and group them ( your time testing above 3.0 volts) as close as possible for best results with the BMS protection board unless it has balancing protection as well most of the BMS boards do not have the balancing feature on them

        You can charge 18650 batteries with out a BMS protection board but you need to have an adjustable power supply that can control current as well as voltage to do this safely charging current should not be more than one amp current and set voltage to 4.1 volts and should be alright but do not walk away from them when charging these batteries if you do not know the history of them you need to check them out for temperature issues while charging them

        If you want to walk away from them while charging do not go over 200 milliamperes current while charging them every so often I would still check the temperature on them when the charging voltage gets close to 3.8 volts and beyond this voltage until fully charged

        They should stay at room temperature or a little bit higher than but not so warm that you can not comfortably keep your hands on them if they are higher than room temperature the warmer they are beyond this temperature I would hesitated using them for this device but this just me personally one note if use the ones warmer than room temperature I would have all the batteries cells that are basically the same temperature when charging for best results but what your results will be are anybody guess

        One final note if you have a battery testing machine that has a temperature sensor in the controller this makes testing and grouping batteries a lot easier
        Last edited by sam_sam_sam; 07-09-2022, 08:57 AM.
        9 PC LCD Monitor
        6 LCD Flat Screen TV
        30 Desk Top Switching Power Supply
        10 Battery Charger Switching Power Supply for Power Tool
        6 18v Lithium Battery Power Boards for Tool Battery Packs
        1 XBox 360 Switching Power Supply and M Board
        25 Servo Drives 220/460 3 Phase
        6 De-soldering Station Switching Power Supply 1 Power Supply
        1 Dell Mother Board
        15 Computer Power Supply
        1 HP Printer Supply & Control Board * lighting finished it *


        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

        Comment


          #5
          Re: Dyson V6 Absolute Not Starting

          What is this Dyson? A cordless vacuum? I remember a friend of mine had the same problem, but can’t remember what was the problem. Apparently there is a lot of them that have trouble at roughly a year went by.
          If it would be mine I just hook my CC CV each power supply to it and crank her up.
          Last edited by CapLeaker; 07-10-2022, 11:41 AM.

          Comment


            #6
            Re: Dyson V6 Absolute Not Starting

            Sorry I thought these were sold worldwide. The word Dyson here is synonmous with hoover. It is an upright hoover, though it barely hooves that much these days.

            Comment


              #7
              Re: Dyson V6 Absolute Not Starting

              is the dyson fully intact when testing ?

              Comment


                #8
                Re: Dyson V6 Absolute Not Starting

                Originally posted by petehall347 View Post
                is the dyson fully intact when testing ?
                Yeah it's fully intact, aside from the battery of course. There are two terminals from the battery that I have identified as positive and negative - I have pulled out the Dyson battery and have connected the terminals from the battery. These things are very temperamental as hell though, so I certainly have not ruled out it stopping after two seconds because of some other, non battery related issue. They are notorious for stopping because of issues with the filter and things like that.

                I'm going to order a few of these to drop the voltage anyway and see what happens.


                https://ie.farnell.com/ixys-semicond...00v/dp/1080095
                Attached Files

                Comment

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