Binky component identification

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Binky component identification

Postby Timboberonion » August 14th, 2015, 5:39 pm

Some background:

3 year old XV21. Replaced the lidar motor about 6 months ago. Came up with the same error just recently, again. Took it apart and the motor is ok, but there is a smoked component on the PCB, guessing it is something to do with the PWM control of the lidar motor. I need to know what it is and if it is replaceable. Picture of component labeled as L20

l20 component.jpg


Any help greatly appreciated.

Tim
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Re: Binky component identification

Postby shirgal » August 14th, 2015, 6:57 pm

Tim,
Just to be sure did you measured the voltage coming out from the 2 pins plug P11 going to LIDAR while system hooked up?

For your inquiry L20 is a monolithic chip ferrite SMD inductor, As with capacitors, component values and identifiers are not usually marked on the component itself; if not documented or printed on the PCB, measurement, is the only way of determining them.
Surface mounted multi-layer chip inductors are tiny and magnetics(you can test this with tiny flat screwdriver)
; often only 3 or 4mm across. Although this physical size limits the values of inductance that can be achieved, typical values of less than 1nH up to a few hundred nH(nano henry)

So i have your L20 inductor measured and from the table bellow you have the codes:
SMD Package identifier
Metric=3216
Imperial=1206
3.2 mm × 1.6 mm
0.126 in × 0.063 in
Last edited by shirgal on August 14th, 2015, 8:14 pm, edited 3 times in total.
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Re: Binky component identification

Postby Timboberonion » August 14th, 2015, 7:42 pm

No, I didn't measure the voltage at P11. I removed and tested the lidar assembly. I assumed there would be no voltage due to the popped component. The picture I posted is from XV11hacking, and is of a good board. My L20 looks like it shot a flame at the P11 then cracked in half :shock: . I see no identifying marks on it. There are quite a few of these "L" SMD's on the board, and none have any markings. Not sure where to go from here - any hints or suggestions?

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Re: Binky component identification

Postby shirgal » August 14th, 2015, 7:48 pm

Tim ,now i see your L20 is broken into half :hand: ,
I have updated my previous reply.

here are 1206 datasheet - http://www.vishay.com/docs/34029/ilsb1206.pdf
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Re: Binky component identification

Postby shirgal » August 14th, 2015, 8:39 pm

Tim,
There is a unused brush motor temp termistor 2 pins plug on the left side corner labeled P9,
I would take one of its conductors L12 or L14 for the L20 job :-)

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Re: Binky component identification

Postby chaos_prevails » January 27th, 2018, 8:34 am

Dear Tim, and Shirgal,
I have the same problem (L20 is burned)

@Tim: did you succeed using the L12/L14 inductor getting your neato back to work?

@Shirgal: could you clarify the the inductance value of the L20? The pdf you linked for the 1206 says 3.3uH. But when I search for ilsb-1206, I find different inductance values, from 1uH to 27uH.

kind regards,
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Re: Binky component identification

Postby mfortuna » January 27th, 2018, 9:41 am

Most vendors provide many values on the same datasheet. As mentioned there is often no marking on a part as small as a 1206. Sometimes you may see the value like a resistor code but you need to know the base. If it is nH. 332 could mean 3.3 uH. If this part is connected to a DC motor I think you would need a value of 1uH or lower since the current rating is 100mA or greater.
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Re: Binky component identification

Postby chaos_prevails » January 29th, 2018, 11:15 am

Thanks mfortuna,
unfortunately there is no marking, also not at the other inductors
I assume the inductor is connected to the lidar motor, as this one stopped working. How could I calculate the needed nH/uH for this SMD from the min/max ampere of the lidar motor it draws?
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Re: Binky component identification

Postby mfortuna » January 29th, 2018, 9:35 pm

Going by the range of current listed in the datasheet you may want to try .33uH which is the highest value rated for 250mA. If you search the forum you will find a substitute motor people have used. The datasheet for that motor may contain the current rating.
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Re: Binky component identification

Postby chaos_prevails » February 2nd, 2018, 6:45 am

Thanks,
I searched the forum and found viewtopic.php?p=127592#p127592 which led me to this enigne:
https://www.jameco.com/z/RF-500TB-12560 ... 73044.html
Maximum current of this motor is 331mA.

So I guess this would be the correct part (choosing 330nH):
https://www.ebay.com/itm/1206-SMD-SMT-C ... q4Zu1v2ijA

And I have another problem:
R68 (1R30) is broken (literally split in two). So I also cannot charge any more. Looking at the size 2512 (6332), 1W seems typical. So I guess this is the correct replacement (choosing 1.3Ohm):
https://www.ebay.com/itm/2512-SMD-Chip- ... ITBdxquFfA

as soon as I have everything put together I will post whether my neato works again :)
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