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New tool to find short capacitors on motherboards : shorty with display

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    New tool to find short capacitors on motherboards : shorty with display

    Hi everyone,

    I would like to share a project I made recently : I adapted a shorty device and added a display.
    it becomes a 0.1mΩ meter with surprising stability.
    the original shorty project is here : https://hackaday.io/project/3635-sho...circuit-finder
    I did one showed here (http://kripton2035.free.fr/Projects/proj-shorty.html) and was pleased with its performances, but it lack a display.

    here is a video showing the measuring of some small values resistors :
    https://youtu.be/4F6QNSpWTos


    here another video showing continuous resistance measuring along a soldier roller :
    https://youtu.be/8mYyr9uKpFU


    and last another video showing how to find a shorted capacitor on a 820-00165 macbook air motherboard.
    fast and easy.
    https://youtu.be/L4V3BWReZLY


    I'm cleaning the schematic and sources, and will share it when it's ready.

    #2
    Re: New tool to find short capacitors on motherboards : shorty with display

    interesting, what is the avr adc resolution, 12bit?

    Comment


      #3
      Re: New tool to find short capacitors on motherboards : shorty with display

      Originally posted by kripton2035 View Post
      Hi everyone,

      I would like to share a project I made recently : I adapted a shorty device and added a display.
      it becomes a 0.1mΩ meter with surprising stability.
      the original shorty project is here : https://hackaday.io/project/3635-sho...circuit-finder
      I did one showed here (http://kripton2035.free.fr/Projects/proj-shorty.html) and was pleased with its performances, but it lack a display.

      here is a video showing the measuring of some small values resistors :
      https://youtu.be/4F6QNSpWTos


      here another video showing continuous resistance measuring along a soldier roller :
      https://youtu.be/8mYyr9uKpFU


      and last another video showing how to find a shorted capacitor on a 820-00165 macbook air motherboard.
      fast and easy.
      https://youtu.be/L4V3BWReZLY


      I'm cleaning the schematic and sources, and will share it when it's ready.
      What micro controller did you

      Could you please post the code that you used for this project

      Thanks for posting this
      Last edited by sam_sam_sam; 02-14-2021, 05:55 PM.
      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


        #4
        Re: New tool to find short capacitors on motherboards : shorty with display

        Nice work adding the screen, I look forward to you releasing the source and schematics.

        Comment


          #5
          Re: New tool to find short capacitors on motherboards : shorty with display

          the microcontroller is an arduino nano
          the ADC is an mcp3421 in 16 bits mode, the 18bits being too slow at 3 samples/sec

          I first used the avr adc (at 10 bits) and it was enough with the shorty initial amplification (x200)
          then I tried the 18b adc and lowered the amplification for better range to 27x
          the video use the 18b adc in 16b mode (and no pga gain)
          it can read 0.1mΩ to around 2.5Ω
          Last edited by kripton2035; 02-15-2021, 12:39 AM.

          Comment


            #6
            Re: New tool to find short capacitors on motherboards : shorty with display

            Thanks for posting.
            I'm following your project with interest on eevblog too

            https://www.eevblog.com/forum/testge...with-display)/
            "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment


              #7
              Re: New tool to find short capacitors on motherboards : shorty with display

              Interesting project...

              Comment


                #8
                Re: New tool to find short capacitors on motherboards : shorty with display

                very interesting project! thx for sharing!
                we wait for details!

                Comment


                  #9
                  Re: New tool to find short capacitors on motherboards : shorty with display

                  share your schematic and code - dont take too long on board layouts - everybody will probably make changes anyway.
                  like ditching the arduino and putting an mcu on the main board.
                  personally i hate din connectors - that may just be me!
                  4mm shrouded sockets would allow me to just use my multimeter probes.

                  Comment


                    #10
                    Re: New tool to find short capacitors on motherboards : shorty with display

                    It won`t be long before the chinese start selling it. Interesting project ,very good .
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment


                      #11
                      Re: New tool to find short capacitors on motherboards : shorty with display

                      Originally posted by stj View Post
                      personally i hate din connectors - that may just be me!
                      4mm shrouded sockets would allow me to just use my multimeter probes.
                      you must have 4-wires probe or you won't get the reading stability like on the video.
                      Attached Files

                      Comment


                        #12
                        Re: New tool to find short capacitors on motherboards : shorty with display

                        inside the shorty prototype
                        Attached Files

                        Comment


                          #13
                          Re: New tool to find short capacitors on motherboards : shorty with display

                          Originally posted by SMDFlea View Post
                          It won`t be long before the chinese start selling it. Interesting project ,very good .
                          Thought on that right after posting my comment
                          My advice, if any good, to is to hide something important and only release to forum registered members.
                          I'm sure anyone would come up with a better idea if @kripton2035 is up to it

                          Comment


                            #14
                            Re: New tool to find short capacitors on motherboards : shorty with display

                            it is based on an open source design - it would be a bit wrong to close it.

                            on connectors - did i say i hate din plugs?
                            so for 4pins i would use mini-XLR connectors.

                            Comment


                              #15
                              Re: New tool to find short capacitors on motherboards : shorty with display

                              just noticed, your prototype has an 8pin adc, but the part number your using is mostly just sold as 6pin sot23 package.

                              not a problem, but keep that in mind if your going to design pcb's

                              Comment


                                #16
                                Re: New tool to find short capacitors on motherboards : shorty with display

                                the shorty original is open sourced, so I really can't make mine a closed design.
                                by the way, there is nothing complicated on this design, just add a display and a better adc on a shorty.
                                I even reused the same protoboard and box where my original shorty was.
                                I only was the first it seems to have this idea and realize it in real.

                                I will publish the design on my web site in a few days, the pcb will come later after testing it.

                                @stj : the adc is on a 8 pins protoboard, but it is a 6 pins, the last two pins are not connected on the adapter sot23-6 to 8pdip.
                                Last edited by kripton2035; 02-19-2021, 09:56 AM.

                                Comment


                                  #17
                                  Re: New tool to find short capacitors on motherboards : shorty with display

                                  i didnt know sot23-6 fited on those soic boards.
                                  that's good because i have a load of those adapters.

                                  infact other than the adc i have it all.
                                  arduino's, blue-pills, esp8266's, oleds - i keep lots of such stuff!

                                  Comment


                                    #18
                                    Re: New tool to find short capacitors on motherboards : shorty with display

                                    I also changed the aop, from a mcp6041 to a ad8628
                                    the mcp had too much voltage offset, and I losed a lot of low mΩ resolution with it
                                    the ad8628 is perfect with 1µV offset.

                                    not sure you also have the aop in your drawers ?

                                    Comment


                                      #19
                                      Re: New tool to find short capacitors on motherboards : shorty with display

                                      i only have dac's

                                      Comment


                                        #20
                                        Re: New tool to find short capacitors on motherboards : shorty with display

                                        ad8628 is just an op-amp??

                                        Comment

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