Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > General Electronics Technical Discussion
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 06-29-2020, 07:09 PM   #1
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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 is offline   Reply With Quote
Old 06-29-2020, 07:12 PM   #2
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

A few photos:
Attached Images
File Type: jpg E3801A76-098E-41A0-9280-1D1493D275C1.jpg (252.2 KB, 19 views)
File Type: jpg 184F16B6-1E6A-4FD5-B0AA-7A53B538B963.jpg (226.9 KB, 7 views)
braxton is offline   Reply With Quote
Old 06-29-2020, 07:14 PM   #3
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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??
braxton is offline   Reply With Quote
Old 06-29-2020, 08:45 PM   #4
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,549
Default 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
budm is offline   Reply With Quote
Old 06-29-2020, 09:30 PM   #5
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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 at 09:44 PM..
braxton is offline   Reply With Quote
Old 06-30-2020, 04:33 PM   #6
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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
braxton is offline   Reply With Quote
Old 06-30-2020, 06:10 PM   #7
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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 at 06:49 PM..
braxton is offline   Reply With Quote
Old 06-30-2020, 08:20 PM   #8
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,549
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

Quote:
Originally Posted by braxton View Post
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 at 08:55 PM..
budm is offline   Reply With Quote
Old 06-30-2020, 09:26 PM   #9
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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
braxton is offline   Reply With Quote
Old 06-30-2020, 10:13 PM   #10
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

I think Q9 is bad. Can anyone help me identify it.
Attached Images
File Type: jpg 15124D4D-5D19-426B-988A-8F40B74D8BE9.jpg (258.4 KB, 12 views)
braxton is offline   Reply With Quote
Old 07-01-2020, 06:16 PM   #11
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,549
Default 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://www.diodes.com/assets/Datasheets/ds30144.pdf
Attached Files
File Type: pdf BSS138_K38.pdf (409.1 KB, 2 views)

Last edited by budm; 07-01-2020 at 06:23 PM..
budm is offline   Reply With Quote
Old 07-01-2020, 08:15 PM   #12
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default 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 at 08:29 PM..
braxton is offline   Reply With Quote
Old 07-01-2020, 10:09 PM   #13
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

Iíve 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 Images
File Type: jpg 633090B9-6579-4CFE-95F5-5772107E06D8.jpg (235.7 KB, 7 views)
braxton is offline   Reply With Quote
Old 07-02-2020, 12:33 AM   #14
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,549
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

Remove it and test it off the board to make sure.
budm is offline   Reply With Quote
Old 07-02-2020, 08:23 AM   #15
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

Quote:
Originally Posted by budm View Post
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.
braxton is offline   Reply With Quote
Old 07-02-2020, 01:28 PM   #16
budm
Badcaps Veteran
 
budm's Avatar
 
Join Date: Feb 2010
City & State: S.F. Bay area
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Knowledge Seeker
Posts: 37,549
Default 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.
budm is offline   Reply With Quote
Old 07-03-2020, 04:57 PM   #17
braxton
Member
 
Join Date: Nov 2009
Posts: 93
Default Re: Anyone Work on Neato Robotic Vacuums or Know about Lidar?

Quote:
Originally Posted by budm View Post
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.
braxton is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2020
Powered by vBulletin ®
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 11:13 AM.
Did you find this forum helpful?