REVISIT - Robotic Vacuum Cleaner - Faulty Brush Permanently Spinning

Hi, this revisit video shows me attempting to fix a Eufy RoboVac 30C robotic vacuum cleaner with a faulty brush that keeps on spinning, even when charging. This model had suffered from liquid damage previously.
Remember that this is just for entertainment and I am not an expert in these repairs. The processes in the video may not be the best way, the correct way or the safest way to fix these things.
I do love fault finding and trying to fix broken things so I hope that comes across in this 'Trying to FIX' series.
Many thanks, Vince.

[@idlethumbs01]

The effort one man goes too, to not do the hovering...! Great video Vince.

[@sihaynes]

Mate you creating a army of robot vacuum cleaners is exactly why I subscribe. Looking forward to the future videos on these!

[@TechGorilla1987]

I laughed so loud when it was about to hoover up your screws. I genuinely laughed a belly laugh.

[@AlexKiraly]

I just had to rewatch it now that you mentioned it, loved that part

[@WildSccotsman]

MOSFETs typically fail with a short source to drain. which means that it appears fully on all the time. That would explain why the brush rotated all the time when switched on.

[@rkan2]

I'm no engineer or a have any education in electronics.. I'd still make my bet on this being the problem! :D

[@iLLusiveMan82]

that's exactly what happened. When he was measuring it on the meter that 0,0035V is basically a short ( source to drain short)...don't worry Vince, the mosfet was fried before you ripped its leg appart :)). Also it took those two resistors with him.

[@retititu]

ayyy

[@Jeroen_a]

That's what i thought from the beginning (mind you i'm no expert at all)... in simple terms.. they act as sort of a electronic switch...power the gate and it switches/connects the source to the drain, no? A short in the mosfet would cause it to be always on, hence the spinning motor..... and to be fair... this has been the case for a long time since the brush hits the contact of the base when charging in the dock and the brush was bent more then the other brush....a bit of a design fault on the device.... i think the both brushes (or just one) could get stuck between the carging dock connectors at some point.

[@itslegiTim]

Seller: So how many of these defective robotic vaccum cleaners do you want? Vince: yes

[@Keythong]

Great fix Vince, well done. Please Vince for the fun and shear entertainment value, once you have fixed them you just have to let them all loose at the same time. I swear it's what everyone wants to see, it will be amazing to watch and you may never get the opportunity again.

[@devttyUSB0]

I love your notes, your learning process, the commenters and everything about these vids. :) Even though i'm screaming at the screen! :) You got it working mate, great job!!

[@justinuptmor8532]

My day was going bad and then I saw you post video in my day around

[@ArreglandoCosas]

I really enjoyed these two vids on these robot vacuum cleaners. Will be waiting for that juicy joblot hehe.. great video Vince, as usual

[@AnxiousDavid]

now we know Vince's grand plan, build an army of robot vacuums for the cleanest world domination ever! Glad to see you got the first one working properly again. Though i would caution testing all 10 on the stairs if one of them decides to jump just like lemmings(not really that is a myth but whatever) the others will follow they hate to be left out.

[@Mymatevince]

Haha, I could imagine them all bumping into to each other until one topples :-) We could place bets on the last robot standing (wheeling) :-)

[@joshpopkie3524]

Watch out, Vince is repairing a robot army! coming to clean a house near you. Lol

[@robtitheridge9708]

Well done vince . The fact that the gate resistor was open circuit almost cetainly means the mosfet was faulty.

[@Mymatevince]

Thanks Rob :-)

[@scottgibson7534]

Hi vince I have already told you certain componments have a maximum temprature for soldering/unsoldering. The mosfet comes in at......Soldering Recommendations (Peak Temperature) d for 10 s(seconds) 260c. In real life you can exeed these, but you have to know a bit about the componmets. With that mosfet the Drain is the centre leg and also the tab soldered to the board, as this is also a heatsink in operation it also covers the back 1/4 of the package. When desoldering you want the heat on the TAB at the top of the mosfet with the air directed at and under this tab NOT concentraited on the top of the package. Also with any liquid damadge board, once cleaned it is a good idea to reflow all the componment joints where the damadge was.

[@LegendSpecialist]

Awesome job 👍 I'm looking forward to other fixes

[@daveharkin4731]

I use a piece of blue tack to hold surface mount components when taking measurements.

[@thomasesr]

The ruler shows the size of the solderpads (footprint) of the SMD components

[@Mymatevince]

Ok, thanks, so it looks like I measured it correctly in the video then. I wasn't sure as the next size up on the ruler looked like the perfect size to solder onto :-)

[@sarah1390]

I see on the Aidafruit website (also available from other sellers) that there is a tool called SMD Component Testing Tweezers. It is tweezers and multimeter combined into 1. I see on that website that it is 27.95 USD and if you can get it from a UK seller I don't think there is much of a price difference.

[@VVerVVurm]

I have one of them and they are great - but the gripping action is mechanically imprecise. when they slip it launches the tiny part into orbit never to be found again. xD

[@rocktoroll77]

I liked both videos cuz I think it’s cool how they work I like how things work awesome job

[@TheOldRogue]

That fet was blown, it wouldn't have broke so easy with what you did by slightly bending the leg mate, the leg would have snapped before you broke the fet in half. Likely the 2 resistors blew because of a faulty fet causing a high resistance and the little things couldn't take it. Lovely fix, enjoyed that one :)

[@Mymatevince]

Thanks Old Rogue :-)

[@standishgeezer]

to measure small SMD components Vince, just use some double sided tape to stick the component down to your work mat whilst you take a reading.

[@Mymatevince]

Love this idea. I have just ordered some reverse ceramic tweezers, cheapo ones from eBay for doing this BUT the double sided tape sounds like a winner. Nice and simple. Thank you :-)

[@VVerVVurm]

@@Mymatevince wow .. i didn't know these existed! It looks like they can do wonders whith some bit of solder wick for clean up jobs requiring much less heat..

[@KirbyEnthusiast]

Great video, i wouldnt know were to start , bit more technical than My Kirby's

[@Danechip]

Watching your video's reminds me of the Truman Show, watching you grow lol. If you get 4 of them in the kitchen, you would have your own robot wars!!

[@mickyparker3949]

Vince I noticed that the Red/Black on the right side is opposite on the left side!!!? Good luck. Love your vids

[@KorAllRBare]

Two 110 Ohm Resistors stacked would give around 54~56 Ohm resistance, and it would be much more mechanically sound Err-Solid, On the udder hand one of those udder vacuum cleaners may make for a donor for all the udder ones, speak-n of which.. Cant wait for the rest of them thar Vacuum cleaner Vidz.. oh yeah... APU I dropped a Like..

[@38911bytefree]

schotky diodes are often used as rectifiers in switching PSUs. No only because it speed but since their drop is half o even lower compared to and standard diode, they disipate half the heat. Computer PSUs can deliver at 50A on 12V, 50A times 0.6 is not the same as 50 time 0.3. Of course the PSu has heatsinks and fans to take the heat out but this lead to less efficiency. Gamer PSU like themrlatake at the 700W range use special 0.1V diodes trying to cut the waste as much as possible. Then they use more complicated rectificatrion things. The drop doenst look that much but at 50A everything gets a problem.

[@VVerVVurm]

and don't forget that the peak current in SMPS is usually much higher than what you actually draw from the output! It's so crazy to see that even the beefiest schotky diodes don't suffice for modern PC PSU anymore and they use synchronous rectifiers. but 50A output could easily mean 500A peak in the rectifier...

[@38911bytefree]

@@VVerVVurm Didnt kenw about peak power issues. But the last time I tried to fix a thermaltake, I tough something wrong was going with the diodes, then discovered this "high efficiency" diodes, from PFC the part start from PFR. But YES, in the most loaded rail sincro rectifying is the way to go. But YOU DONT THEM until tru 650 to 700 or ... 247 server PSUS. Even the High efficiency HP PSUs for desktops got away with diodes LOL High eficiency is probably 80 plus. They dont tell. Anything MOSFET based with Active PFC is in this line IMHO. Some still sorting the outwith diodes. When thing get wild ... sincro rectifiers.

[@doomhuntress886gaming]

*Robot vacuums* Vince: NO DON’T SUCK MY SCREWS

[@cw2126]

Your da man vince 👍

[@danydbdb]

The 2Kohm reads 30B which is 2Kohm in EIA-96 code.

[@iceman9097]

Hi Vince you can get a SMD tester on wish for £13 model number HP 990B. Hope this helps 😊👍

[@Ghost82uk]

The resistor is a calculation like the colour bands mate, 220 is 22ohms, look up a value calculator, there's some good ones online

[@ches74]

Nice one, Vince. The problem circuit was in the water damaged corner, wasn't it? I suspect that it was switched on when wet resulting an excessive current draw through the MOSFET which caused it to fail short circuit. That excessive current is probably the cause of the resistor failures also. For parallel resistors it's not quite the path of least resistance, best look up the formula. e.g.10 & 47 ohms in parallel= 8.24ohms. 100 & 100 = 50. One thing I keep saying, your little bit of solder isn't a little. Please search for images of solder fillets, Blobby joints are painful to see. Why buy components from eBay? Better to get them from CPC, Digikey, RS, Mouser etc. more certain they're legit and they have the datasheet so you can check dimensions etc.

[@borgred]

SK34A is the micro version at 45p each

[@CLC-1000]

Great revisit video Vince.

[@Mymatevince]

Thanks :-)

[@CLC-1000]

@@Mymatevince You're welcome.

[@conorwalsh9360]

invest in a SMB sample book works very well with SMB ruler

[@jrsc01.]

Hi Vince, any update on the LCD VGA upgrade on the Sega Game Gear?

[@MrDsmen]

Hi Vince, I wouldnt recommend buyingmosfets or any power components from china/ebay/aliexpress, a lot of times they are either fake or in the better case they are recycled, the fake ones like to go bang or arent up to standard of the original. also when I say fake I mean sanded down package with new laser etched part number on it, so you never know what you are really getting

[@VVerVVurm]

the fake chips are a major problem. however it is mostly when buying chips that are no longer in production that it becomes a concern.

[@Mymatevince]

Thanks for the info :-)

[@antonia4722]

Resistors in parallel Rt=1/R1+1/R2.... eg. 2 x 8 ohm resistors in parallel=4 ohms.

[@DemonGunLiz]

When you fix all of them you should launch all of them in the same room and watch them bump into each other.

[@swiftrick15]

SHOTTKY diodes allow current to flow back ...that is the down side and purpose of SHOTTKY, yes voltage drop is better, but there is a pay off. Horses for courses.

[@Danechip]

What did you pay for the job lot?

[@RichardHeadGaming]

A blown mosfet can toast the resistors in its circuit.

[@TheBoringCreatr]

54:44 your face looks like the face out BONEWORKS i like it. and nice haircut u have :)

[@pvc988]

Now you need to get shark suit for your cat (If you have one).

[@vegoutwithvegge]

I could watch it for hours....ok boomer :)

[@wasserman63]

i am certain it was both the resistor and the mosfet

[@Mymatevince]

Thanks Axel :-)

[@foxycutie8267]

Hi

[@MrRewdtv]

Should have used your solder paste and your heat gun

[@res1492]

You have the heat gun...why are you messing about with the iron..stop being so worried the heat...you are careful enough

[@lbrahimk-o9w]

مرحبا

[@Zodliness]

😂 😂 Invented because in reality, both sexes hate vacuuming! 😂😂

[@robquinton9835]

its probably some corrosion shorting a track somewhere still feeding power to motor

[@HazzaTL2]

NO QUICK VERSION? Love your videos, but too long winded. please bring back the Quick Versions.

[@ftrueck]

most likely the mosfet was the problem. Normally the plastic case would not break with so little stress.

[@Mymatevince]

Thanks Florian :-)

[@VVerVVurm]

are you talking from experience? I am genuinely cuious. they do not mentioning bending radius/distance in any smd datasheets. but for through hole devices the manufacturers are notoriously paranoid about bending stress. they usually require clamping the lead near the package and bending distance at least 2 mm from the package. we hobbyists usually don't care though..

[@ftrueck]

VVerVVurm no there are no radius infos in datasheets for smd components but I experienced this a few times. If a mosfet failed the plastic case got very brittle because of the heat. I obce had a failure where the breach uncovered the chip die and it was covered with black dust. There is no guarantee for my answer but the leg seemed not be bent too much. I guess with excessive force you can kill a mosfet also but who knows what the real cause was?

[@andersmmvfc.8376]

Awsome vince! Can you plz keep them until you fix them al and then have 11 over them cleaning your kitchen at the same time :) maybe do it gradually so first one then 3 5 7 9 11 see what number of vacuums do the most efficient job. So entertaining as usual thank you!

[@ecobob101]

So do this - It would be a laugh them all trying to avoid each other

[@Mymatevince]

Haha, I will do this :-)

[@UltimatelyEverything]

Lol that would be entertaining

[@mattyfupepper]

The robovac demolition derby we've all been waiting for lol

[@krzysztof_46]

Hi

[@willproctor7301]

Love your videos Vince, especially when you solder something and to me it looks perfect. Then you go and retouch it or add too much solder lol. Your first go soldering usually looks bang on. Hold back on the extra solder and retouching if you can mate, save me from shouting "LEAVE IT ALONE" at the screen each time :). PS looking forward to your future army of robot vacuum cleaners. Imagine ten of those little guys running around the place all at once.

[@jeremydewolfe8026]

36 minutes in watch a robo vac try and eat its own guts.

[@MrKeebs]

The resistor is 30"B", not 308 which is also 2k Ohms :) Amazing video as usual.

[@techman2471]

Your 2k ohms resistor are labelled with the EIA surface mount resistor code. Google it and get a cheat sheet for your smt resistors. Also, if you teepee those resistors 47 and 10, you made a 57 ohm set.

[@Mymatevince]

Thanks David :-)

[@jasonudall8614]

To be frank 57 (58?) Ohms Vs 47 ohms for the gate inrush limit resistor( that's what is is doing) "is close enough"

[@techman2471]

I know, but Vince was looking for comments and I was giving mine

[@idea22yt]

43:26 That's wrong Vince. If two resistors are in parallel current won't flow only by the easiest way, it will flow both ways, that means total current will be higher compared with using just the lower resistor. Example: 2 x 100 ohm in parallel = total 50 ohm 100 and 200 ohm in parallel = total 66 ohm 10 and 47 ohm in parallel = total 8 ohm Formula is: 1/Rtotal = 1/R1 + 1/R2 + ... + 1/Rx

[@Mymatevince]

Thanks Peter :-)

[@Danechip]

@@Mymatevince To simply put it, on your calculator, put in the first value and hit 1/X then add the second value and hit 1/X, hit ='s and hit 1/X again. And mentioned, equal values just half it, as in series just add the two values together.

[@andyfairman7812]

Another rule of thumb is that the total parallel resistance will always be less than the smallest value resistor. ;)

[@JSJneo]

Alright! My day just got way better, Thanks for the video Vince!

[@Mymatevince]

Thanks Kenneth:-)

[@unmountablebootvolume]

I've only seen mosfets fall apart like that one after they blew up. When you lift a leg on a good one it just bends the plastic case and the bonding wire connecting the leg to the chip, but when it blows up the pressure breaks the case into multiple pieces so that the whole component falls apart when you apply even a small amount of stress to the case. It is possible that the fet was blown up by either running the device without the flyback diode (wich suppresses the reverse voltage spike, that motors and other inductive components generate when you stop the current from running through them) connected across the motor, or just by a short circuit sending unhealthy amounts of current through the fet.

[@DoNotContactMe]

The legs on these types of mosfets are very stiff. The package will break before the leg will bend. You can see the package crack when he tried to lift the legs.

[@oldman1944]

As tamagotono says, the legs on these are too stiff to bend without breaking the package. I found this out two days ago messing with a BMS.

[@andysimkin5200]

Vince, why don't you reuse components from other broken boards save waiting on parts from China. Nvrmnd.. I've just seen nearer the end of the video

[@Leonvolt28]

36:29 I thought that it was gonna suck up its own screws 😂 You did a great job. I watch these type of videos for hours.

[@moosesugar]

i think it was the mosfat rather than the resistors i enjoyed this fix and i would rather you fix them one by one rather than do what steve from tronicsfix does and cut the videos short and show less detail

[@bearcingetorix6326]

But...but... the resistors were independently tested and failed...

[@solveit1304]

I bought Eufy Robovac 11 for like 30$, seller says that battery is going flat after 5 minutes. But that was not the case - 4 beeps and steady light so main brush. I opened it and there are hairs everywhere, they stuck motor, after cleaning everything works fine :) Thanks for inspiration to buy this robovac :)

[@Fifury161]

8:35 - it's quite normal to have missing component locations - these are usually design decisions. The main reasons are normally due to inventory - similar components with different footprints. It can also be different revisions or local requirements (such as electrical noise suppression or power filtering based on region). Some products are sold with different features, rather than make multiple revisions of the board they simply omit the components that add those extra features. So you can have a "base" model & a "luxury" model - both using the same PCB, saving costs!

[@Mymatevince]

Thanks Fifury :-)

[@technixbul]

The resistor is 0.220 Ohms, it should be easier to solder Schottky diode with hot air, those diodes are best suitable for high frequency power supply rectifying because of their low drop voltage and less capacitance. I think that 2 transistors in series drive that motor, one turns on by CPU when you turn on power (the healthy one) and the second (faulty one) is turned on by CPU when cleaning mode is active. You can actually test MOSFETs for short - directly on the board. You can't desolder that transistor with iron due to massive heatsinking, only with hot air. You can desolder a transistor like this from old computer motherboard as here is not critical because is used as electronic switch, just make sure it is correct N or P type. I see you leaned resistor colour code. It does not reading proper value because of the resistor tolerance is +/-5%. Resistors in series ADD values, resistors in parallel give value = 1/R1 + 1/R2.

[@AnonymousRepair]

You get smd tweezers for multimeters, I think you switched your source and gate the resistors is on the gate of the mosfet

[@robdgekke]

I would keep that one if I where u. U did allot on it. And you admitted it u like watching it doing his job..

[@VVerVVurm]

I agree. also he should give it a name. :D

[@Le_Kret]

Szczotki - sz:sh (like in shop), cz:ch (like in chuck). Chears!

[@ShravanSuryanarayana]

great debug!!! I did resolve some issues in a bigtrac robot after you inspired me. so thanks for that. It is also nice to see you being amused by the cliff sensor.

[@SOB821]

lump of blue tack is ideal for holding smds for testing

[@paulcraven4876]

Actually 18650 means 18mm diameter 65mm long and the 0 means its cylindrical

[@gorjy9610]

resistor value is not so important in case like this, gate resistor is there just to protect a gate. In fast switching applications putting very high value can be a problem but here where mosfet is just on or off (motor running or not) even if you put 1k you will not see a difference. And yes, that mosfet was dead before you pull that leg up.

[@Mymatevince]

Thanks Goran :-)

[@jaroslavtatar4035]

As i wrote on last video. Get some ceramic tweezers. You can buy reverse tweezers. Then its holding as you wanted at time 40:4*

[@Mymatevince]

Thank you, I have just ordered some reverse ceramic tweezers from eBay. I got ones with a slight curve on them so hopefully they will lie flat on the surface to make testing easier :-)

[@VVerVVurm]

how did i miss this things existed? thank you!

[@konohh]

Some resistors of this size are marked with a coding: www.resistorguide.com/resistor-smd-code/

[@martinmeyer2008]

You can't measure resistors when they are in the circuit, you'll get very erroneous results! If you suspect a resistor, it'll have to come out to be tested :-) @ 23:35 you're not getting a reading because there is a short through the mosfet - its blown IMHO.

[@DoNotContactMe]

You are half correct. You can get wrong readings while in circuit, but the resistance will always read equal to or lower than the actual value. He was measuring an open, so it is likely the resistor is open.

[@Fifury161]

5:55 - the use of a diode here is to suppress the back EMF (Electro Motive Force) from the motors (it can also help reduce switching noise). A Schottky diode is used here suggesting there is PWM (Pulse Width Modulation). A diode helps suppress the electrical noise - with PWM the response times need to be quicker, also these diode types are more efficient - good in a battery powered device!

[@mohamadasriabdulazid4784]

The resistor is not 308 it be 3Gohm. It is 30B is a precision resistor it read 2kohm with 1% accuracy, while 202 is 2kohm with 5% accuracy. Indeed the MOSFET is faulty, instead been as switch it becomes a wire, that keep supplying power to the motor.

[@Mymatevince]

Thanks Mohamad :-)

[@thomasesr]

The brush motor is turned on and off by a transistor controlled by the main chip. The main chip sends a low voltage and low current signal to the transistor's gate and the transistor either connects the motor black wire to ground or leave the motor's black wire with high resistance (basically disconnected) for instance. This type of transistor is usually a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), and when they fail, they usually fail closed circuit, making it basically always on.

[@Mymatevince]

Perfect explanation. Thank you :-)

[@handsolo1209]

Watch the film "Runaway" and see if you still want household robots!

[@VVerVVurm]

I love this movie although it's a little bit trashy. I always wanted to have/build the little spider critters. :D

[@nightstah]

I'm surprised you didn't measure the two resistors out of circuit that you suspected were faulty. Another good follow-up vid (if I ran one of those through my house of three kids and five cats it'd choke to death on dirt and hair and never make it through a single room before giving up the ghost, lol)

[@Mymatevince]

Hi, I did test them out of circuit but I cut that bit out of the video as it was getting too long:-) They both tested open so had no reading :-)

[@charlesjmouse]

Always fun and entertaining, thanks. I know this is an old video, but a couple of learning points for any who may read: -Never (re)move a known working component - every dab with a soldering iron is a risk to the component and the board. (remove, test, never swap!) -Continuity testing is certainly important, but check that all components are present and where missing replaced first. -While useful at times, be VERY wary when testing components in situ - you will get some potentially misleading results. I hope that helps somebody. Kind Regards,

[@radekvamowski8092]

there are smd tweezers for your meter you can get on ebay. ebay: 143199750482 for example. also got the same ruler XD

[@TheMrbobscott]

www.ebay.co.uk/itm/SMD-Inductor-Test-Clip-Probe-Tweezers-Resistor-Multimeter-Capacitor-top-ATF/192417605491?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

[@DanPottas]

I would think about buying one of them others off you when u fix them let me know if you would sell one when working pls vince.

[@MightyJabbasCollection]

Your house is going to be SUPER clean after you repair all 10 of those vacuums.

[@pds8475]

The resistor has the EiA-96 marking which is 30 B. The code 30 is 200 in EIA-96 and the B is a multiplier of 10. Here is a link to a table www.hobby-hour.com/electronics/eia96-smd-resistors.php

[@pds8475]

The MOSFET went s/c and drew to much current through the resistors causing them to burn out and go o/c. The MOSFET would of heated up when it went s/c and damaged the package and caused a micro crack. So when you soldered it, it caused it to fully crack.

[@Mymatevince]

Perfect, thank you PDS :-)

[@catcam]

Mosfet was bad 100% ... by the way how good is your digital microscope (is it worth buying) ? ..again tnx for great content and greetings from Croatia

[@Mymatevince]

Thanks, I haven't really used it enough yet to say whether it is worth it or not. From first few impressions it works well to view but I am not sure if there is enough room to solder underneath it :-)

[@catcam]

Thanks Vince

[@hianyonethere]

Great video looking forward to the next ten

[@Bi0]

xD Anytime I work on stuff like this I wear gloves. Yet Vince is over here picking up them petrified chips. haha

[@therealtrip9723]

Hi would just like to say this when removing connectors that require force. Please dont pull at the cable pull at the connector. This only applys to some. Still PLEASE.

[@sarah1390]

With resistors depending on their tolerence, values are designed to cover their tolerence range. for instance if the resistor is 47 ohms at 1% tolerence, the measurement can be anywhere from 46.5 ohms or 47.5. If the tolerence of the resistor is rated at 10% then the resistor can measure about 42 to 52 Ohms. I wouldn't worry too much in this situation just as long as you have a resistor that is as close as possible. here is a good website that explains resistor tolerences and how they are manufactured in a way that it covers their tolerence range www.resistorguide.com/resistor-values/

[@tinom2649]

The usage of a letter prevents the confusion with other marking systems. However, pay attention because the letter R is used in both systems. For resistors with tolerances other than 1%, different letter tables exist. As with package codes, these resistance value codes are common, but a manufacturer may use a variation on these or even something completely different. It is therefore always important to verify the manufacturer’s marking system. Code Multiply factor Z 0.001 Y/R 0.01 X/S 0.1 A 1 B/H 10 C 100 D 1`000 E 10`000 F 10`0000 Code Value Code Value Code Value Code Value Code Value Code Value 01 100 17 147 33 215 49 316 65 464 81 681 02 102 18 150 34 221 50 324 66 475 82 698 03 105 19 154 35 226 51 332 67 487 83 715 04 107 20 158 36 232 52 340 68 499 84 732 05 110 21 162 37 237 53 348 69 511 85 750 06 113 22 165 38 243 54 357 70 523 86 768 07 115 23 169 39 249 55 365 71 536 87 787 08 118 24 174 40 255 56 374 72 549 88 806 09 121 25 178 41 261 57 383 73 562 89 825 10 124 26 182 42 267 58 392 74 576 90 845 11 127 27 187 43 274 59 402 75 590 91 866 12 130 28 191 44 280 60 412 76 604 92 887 13 133 29 196 45 287 61 422 77 619 93 909 14 137 30 200 46 294 62 432 78 634 94 931 15 140 31 205 47 301 63 442 79 649 95 953 16 143 32 210 48 309 64 453 80 665 96 976 Tags codes, packages, resistor, resistor code, smd, smd code, smd resistance code, SMD resistor, smd resistor code, smd resistor dimensions, smd resistor marking, smd resistor sizes, smd resistor values, smd resistors, smt, surface mount CONTENTS What are SMD Resistors? SMD resistor calculator SMD Resistor Packages Resistor SMD Code The Three and Four Digit System The EIA-96 System Read more www.resistorguide.com/resistor-smd-code/ so 30 is 200 b means *10 so 2k

[@OmarMekkawy]

Could you take high resolution photos for the PCB. I want to reverse engineer it please.

[@bearcingetorix6326]

I have Eufy 30C, it works amazing, no problems, but I stumbled on to the first vid, now here I am on the second... My one question, did you end up bending back the front bumper springs to recharge them? Great stuff!

[@TechGorilla1987]

As for the clamp to hold things - that Blue Tac I mentioned before really helps to hold down tiny things and doesn't leave any residue on anything. I use it to hold posters and wires in place. Great stuff!

[@Mymatevince]

Yeah, I like the Blu Tack on slightly bigger components but with these tiny resistors they kept getting buried inside the Blu-Tack. I did film it but cut it out to shorten the vid. Double sided sticky tape was one of the suggestions given in the comments and I think that might be a winner :-)

[@PaverickFA18]

R220 is supposed to be 0.22 omes

[@psialt9720]

Well done on fixing that, good video. You should not be touching those mosfets because both brushes was spinning. It was wrong control of one mosfet -- a failed pulldown resistor. And, just an advice: you need to learn more theory about components.

[@bernhardmichaelfux308]

Did you bother the reading of the Chinese resistors? Don`t worry! The reading of these resistors is not an exact game! It`s an average value. If the resistor should have 2K, you can read 1990 Ohm as well... And, Bytheway - your cheap Multimeter also is not accurate enough to give 100% readings. There are always tolerances to deal with. The main thing is that it works at last, isn`t it? And - you don`t work with exact 12 Volt either but more with 13,5 to 11.somewhat in such circuits!