REVISIT - Robotic Vacuum Cleaner - Faulty Brush Permanently Spinning
ฝัง
- เผยแพร่เมื่อ 27 ส.ค. 2024
- 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.
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Seller: So how many of these defective robotic vaccum cleaners do you want?
Vince: yes
The effort one man goes too, to not do the hovering...! Great video Vince.
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.
I'm no engineer or a have any education in electronics.. I'd still make my bet on this being the problem! :D
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.
ayyy
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.
I laughed so loud when it was about to hoover up your screws. I genuinely laughed a belly laugh.
I just had to rewatch it now that you mentioned it, loved that part
Mate you creating a army of robot vacuum cleaners is exactly why I subscribe. Looking forward to the future videos on these!
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.
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,
I've just bought a Robovac 12 with exact that fault and it turned out to be a faulty transistor Q9, which shorted parts of the board and caused one of the motors to spin all the time. I've been watching your videos for a long time and it helped me to have the courage to try things out :-)
Alright! My day just got way better, Thanks for the video Vince!
Thanks Kenneth:-)
i bought one of these, similar looking design but a different name, best thing i have ever bought!! i only have to vacuum my actual stairs now, if anyone reading this was thinking about buying one.... DO IT! you wont regret it
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.
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.
Thanks David :-)
To be frank 57 (58?) Ohms Vs 47 ohms for the gate inrush limit resistor( that's what is is doing) "is close enough"
I know, but Vince was looking for comments and I was giving mine
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.
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.
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.
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.
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!
So do this - It would be a laugh them all trying to avoid each other
Haha, I will do this :-)
Lol that would be entertaining
The robovac demolition derby we've all been waiting for lol
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 :)
Anybody else want to see Vince conquer the world with his army of robotic vacuums?
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.
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!
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 :-)
My day was going bad and then I saw you post video in my day around
The resistor is 30"B", not 308 which is also 2k Ohms :) Amazing video as usual.
Fun rollercoaster Dépistage again. I just enjoy the commentary, think along and enjoy watching your sleuthing method.
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!!
woa woa wait a second vince i paused the video when that mosfet broke and i played it back in slow motion on youtube and as you unsoldered that first mosfet leg the side that was faulty as you unsoldered it you can clearly see a hairline crack / fracture in the mosfet you did not break it that was already damaged go back and re watch that very moment in slow motion and you shall see it my friend keep up the awesome repair vids i love coming home from work to relax and watch these :D thumbs up
nice one mate, a followup thats what i like about you. True British grit we shall never surrender, even thow were not sure what were doing we will learn as we go
I really enjoyed these two vids on these robot vacuum cleaners. Will be waiting for that juicy joblot hehe.. great video Vince, as usual
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!
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.
Haha, I could imagine them all bumping into to each other until one topples :-) We could place bets on the last robot standing (wheeling) :-)
Great Job! Love the revisit. Note for your edification: The Schottky diodes look to be there to stop back voltage from the electric motors. If the unit is off and you spin the electric motors they act like electric generators. Those diodes stop the back flow of electricity from damaging the board.
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!
Thanks Fifury :-)
Just watched both the videos, glad you got it working and what a great buy. Look forward to seeing the other videos
The ruler shows the size of the solderpads (footprint) of the SMD components
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 :-)
This video is very timely for me because I'm waiting for a Eufy 11 in the mail that I bought off ebay last week which has a front bumper stuck error.
Great video looking forward to the next ten
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
Thanks Peter :-)
@@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.
Another rule of thumb is that the total parallel resistance will always be less than the smallest value resistor. ;)
I use a piece of blue tack to hold surface mount components when taking measurements.
Awesome job 👍 I'm looking forward to other fixes
Watch out, Vince is repairing a robot army! coming to clean a house near you. Lol
@41:10 That's what i've used a pair of cheap wide plastic tweezers for. You can buy tweezer probes, but glueing two male dupont tips to a plastic tweezer and wire it up does the same job. It's very useful for reading such small parts with a multimeter or component tester.
Well done vince . The fact that the gate resistor was open circuit almost cetainly means the mosfet was faulty.
Thanks Rob :-)
Another excellent video, I think a separate video per vacuum would be great! Doesn’t matter if it’s the same type of item being repaired, it’s the entertainment of watching you repair them that we want 😊 (Tronicsfix gets away with PS4’s all the time 🤔)
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.
Love the videos Vince, looking forward to the next 9 robot repairs! It actually inspired me to do a small teardown and repair of some of my broken electronics teaching my girlfriend along the way. I wish more people repaired their electronics before throwing them out before rushing to replace them with the latest, shiniest model. Btw I'm pretty sure the MOSFET was blown, it fell apart too easily and broke not at the leg, but rather the leg and a part of the case. As others have said you should try to avoid measuring in-circuit as other parts may be influencing your readings leading you down a rabbit-hole.
Hey Vince, don't worry about melting plastic connectors with hot air, cover them in blu-tack and they will be protected from the heat. Use lots.
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.
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 :-)
@@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..
I like the job lot videos - the Walkman one was particularly good, especially since they all had different faults
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)
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 :-)
With all these spare cleaners now, you can swap out a 57 resistor :)
I would actually like 1 of these now.
Great revisit Vince
Very true Emma. I will see if I have a spare board leftover at the end of the job lot :-)
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.
Perfect explanation. Thank you :-)
Ok now I'm jealous - your soldering setup is better than mine, and you're better than me at SMD! Well done Vince :)
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.
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
Great video well done
Really enjoying these types of videos I learn a lot from them
👍
I liked both videos cuz I think it’s cool how they work I like how things work awesome job
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
This time I hit that like button before I even watched the video. No more oopsies like last time.
This video was indeed great! I would be looking foward to see the videos of you trying to fix the rest. It would be like the videos by tronicsfix
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..
I agree. also he should give it a name. :D
About the small multimeter measuring thing you wanted. i did a seach on ebay for "multimeter tweezer" i think thats what you are looking for. i havent tested any, and i think the leads on most of them looks kinda dodgy, but might not need it for so small parts.
EDIT: Thanks so much for your videoes!
Awesome!!!! Great work Vince!
Thank you Chris :-)
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 :)
Thanks Old Rogue :-)
36 minutes in watch a robo vac try and eat its own guts.
I almost purchased this thing. You saved me, headache man.
Great video, i wouldnt know were to start , bit more technical than My Kirby's
so happy for your success!!!
lump of blue tack is ideal for holding smds for testing
As Vince tests the vacuum over his soldering pad vacuuming up 8 screws and "oh gutted" lol
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..
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.
Thanks Goran :-)
Thumbs up cracking vid cant wait for the other ones
Omg I’ve read the comments before watching the video and already laughing before it even started
These videos as so addicting :) :) Loved the first part and now this revisit part!!!!
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*
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 :-)
how did i miss this things existed? thank you!
40:36 you can in fact get probes in the shape of tweezers that do what you describe, they're perhaps a little bit bulky (cheap ones at least) but they do the job quite nicely and plug directly into a multimeter. They have the polarity marked on the side too. Mine have annoyingly short wires but again that may be because I bought cheap ones. The search term is Tweezer Probes.
Loving these videos
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!!
xD Anytime I work on stuff like this I wear gloves. Yet Vince is over here picking up them petrified chips. haha
Vince I noticed that the Red/Black on the right side is opposite on the left side!!!? Good luck. Love your vids
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.
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...
@@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.
You get smd tweezers for multimeters, I think you switched your source and gate the resistors is on the gate of the mosfet
Your house is going to be SUPER clean after you repair all 10 of those vacuums.
When checking if a component has fallen off, it is really clear as there will be a component sized imprint in the solder on the empty pads. Check your last video and you will see there was a clear imprint of where it should be when you lost that cap from the board.
Cheers Paul :-)
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
But...but... the resistors were independently tested and failed...
Likes watching the robot vacuum cleaner videos
Thanks for these interesting videos
The SMD resistors measuring below 100 ohms would have numbers like ‘390’ printed on them and have different multipliers. You can research these values on the web.
Resistance (ohm) is only properly measured with the components removed from the circuit. When you have a "mesh" of circuits tied together with many resistors in serial mode or/and parallel mode the value of one resistor is adultered. Regards
40:37. They do. One such device would be cross-locking ceramic tweezers.
Another method would be to buy some of those smd tweezer-probes that would plug into standard multi-meter banana jacks.
YES, the MOSFET was bad. I was saying that as soon as I saw the motor was staying on. Same as WildScotsman said below....shorted MOSFET stays on. That is the brush motor controller "switch".
For the SMD resistors etc that are that small, have you thought about buying a £3 - £5 USB soldering iron. They are good and have narrow pointed tips that are ideal for SMD. I used to buy the practice boards from ebay and Banggood and although I have a soldering station with the iron and hot air gun, the USB iron was better. I bought the USB one after I watched a Big Clive video on them.
@36.49 - Vince hoovers up all those tiny svrews. LOL At least you'll know where to find them :-)
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.
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.
Your da man vince 👍
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.
SK34A is the micro version at 45p each
*Robot vacuums*
Vince: NO DON’T SUCK MY SCREWS
Great revisit video Vince.
Thanks :-)
@@Mymatevince You're welcome.
Szczotki - sz:sh (like in shop), cz:ch (like in chuck). Chears!
Hi Vince you can get a SMD tester on wish for £13 model number HP 990B. Hope this helps 😊👍
The resistor is a calculation like the colour bands mate, 220 is 22ohms, look up a value calculator, there's some good ones online
Watch the film "Runaway" and see if you still want household robots!
I love this movie although it's a little bit trashy. I always wanted to have/build the little spider critters. :D