Anyone Work on Neato Robotic Vacuums or Know about Lidar?

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  • braxton
    Senior Member
    • Nov 2009
    • 146

    #1

    Anyone Work on Neato Robotic Vacuums or Know about Lidar?

    I have a Neato Botvac D80 series robotic vacuum with an error 3000 (problem with the lidar sensing unit). Basically, when the lidar unit starts to spin up, it doesn't reach the proper speed but spins fast and then slow and then speeds up and then slows down etc. until it errors out.
    Because i have a spare working unit, I was able to track the problem to a small simple board at the base of the lidar unit.

    I will attach some photos shortly.
  • braxton
    Senior Member
    • Nov 2009
    • 146

    #2
    Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

    A few photos:
    Attached Files

    Comment

    • braxton
      Senior Member
      • Nov 2009
      • 146

      #3
      Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

      The 4 wires go to the main board. Power, ground, Rx and Tx.

      Where to go from here??

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

        Since you do have working board for comparison:
        1) Do you have the oscilloscope to check Rx and Tx signals?
        2) You can also check Voltages of IC U1.
        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

        • braxton
          Senior Member
          • Nov 2009
          • 146

          #5
          Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

          i do not have an oscilloscope but I can try to check voltages of the one chip.

          I think U1 is a Texas Instruments LM393A Dual Comparator chip.
          Last edited by braxton; 06-29-2020, 09:44 PM.

          Comment

          • braxton
            Senior Member
            • Nov 2009
            • 146

            #6
            Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

            I also think this defective board is somehow supposed to wirelessly power additional boards on the top side of the lidar unit, as well as wirelessly communicate with the other board(s).

            See
            http://blog.avrnoob.com/2015/08/neat...-1-ir.html?m=1

            Comment

            • braxton
              Senior Member
              • Nov 2009
              • 146

              #7
              Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

              It looks like the board gets the 5V signal, which powers the U1 chip and also powers the coil. I believe the coil is used to inductively power the top board, which contains the laser etc. All seems good there.

              I also notice that D4 glows red but D2 does not light up at all.
              Is it supposed to?

              I suspect that D2 and D4 communicate wirelessly with corresponding Rx and Tx diodes on the upper lidar board.

              Is it possible that D2 is bad (how would I test it?) and if so what would be a suitable replacement?
              Last edited by braxton; 06-30-2020, 06:49 PM.

              Comment

              • budm
                Badcaps Legend
                • Feb 2010
                • 40746
                • USA

                #8
                Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                Originally posted by braxton
                It looks like the board gets the 5V signal, which powers the U1 chip and also powers the coil. I believe the coil is used to inductively power the top board, which contains the laser etc. All seems good there.

                I also notice that D4 glows red but D2 does not light up at all.
                Is it supposed to?

                I suspect that D2 and D4 communicate wirelessly with corresponding Rx and Tx diodes on the upper lidar board.

                Is it possible that D2 is bad (how would I test it?) and if so what would be a suitable replacement?
                Well you do have working board so you can see what D4 and D2 should behave, one of them may be emitter (D4) and another one is for receiver (D2). What kind of cover is installed on top of those two diodes?
                The inductor output may be connected to the white connector. Where does it goes to? LIDAR motor assembly?
                Q2, 3, 5, and 6 look to be for driving LIDAR motor.
                How about showing the other boards and how they are connected together?
                Last edited by budm; 06-30-2020, 08:55 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

                • braxton
                  Senior Member
                  • Nov 2009
                  • 146

                  #9
                  Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                  This link has pics of the other top boards and likely explains everything better than I could:

                  http://blog.avrnoob.com/2015/09/neat...t-2-lidar.html

                  Comment

                  • braxton
                    Senior Member
                    • Nov 2009
                    • 146

                    #10
                    Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                    I think Q9 is bad. Can anyone help me identify it.
                    Attached Files

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                      Why do you think it is bad since you do not know what it is? Did you compare the readings, Voltage and junctions, to the working board?
                      BTW, that link in your post #9 is useless, it does not show how all the boards are connected together. I guess you are not going to provide the info as requested. Good luck, I'm out.
                      K38 = BSS138
                      https://cdn.badcaps-static.com/pdfs/...e0c2c6e155.pdf
                      Attached Files
                      Last edited by budm; 07-01-2020, 06:23 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

                      • braxton
                        Senior Member
                        • Nov 2009
                        • 146

                        #12
                        Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                        That link (parts 1 and 2) does indeed explain the connections to all the different boards in the text. The bottom board powers the top boards wirelessly and communicates wirelessly as well.
                        The part is bad because it is shorted across the 2 pins on the same side (not the case on the working board)

                        The part in question links directly to the brown wire (which is either Rx or Tx), which in turn links to the main robot board.
                        Last edited by braxton; 07-01-2020, 08:29 PM.

                        Comment

                        • braxton
                          Senior Member
                          • Nov 2009
                          • 146

                          #13
                          Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                          I've shown the connections to the transistor/mosfet.
                          The pin labelled G is ground. This circuit connects to D4 which transmits or receives IR signals from the top board.
                          Attached Files

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                            Remove it and test it off the board to make sure.
                            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

                            • braxton
                              Senior Member
                              • Nov 2009
                              • 146

                              #15
                              Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                              Originally posted by budm
                              Remove it and test it off the board to make sure.
                              Yes I did that already. Those two pins on the mosfet are shorted (actually 40 ohms resistance). The 3 connections on the board are not.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                                The pins are Gate and Source, it may nave been damaged by static discharge. Be careful when handling MOSFET, they are easily damaged by static discharge.
                                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

                                • braxton
                                  Senior Member
                                  • Nov 2009
                                  • 146

                                  #17
                                  Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

                                  Originally posted by budm
                                  The pins are Gate and Source, it may nave been damaged by static discharge. Be careful when handling MOSFET, they are easily damaged by static discharge.
                                  Thanks for making me aware of the static sensitivity of this mosfet.

                                  Comment

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