Trying to FIX my Wife's ORAL-B Electric TOOTHBRUSH

[@giovannifoulmouth7205]

Vince pls don't lie to us, that is you and your wife in the thumbnail and you look very happy together.

[@ami6packs]

happy wife = happy life :)

[@samuelfellows6923]

I assume that was a [his’s & hers] toothbrush advertisement

[@TrueBrit1]

@@ami6packsMore like, happy wife = happy credit card company.

[@jct4647]

99% clean IPA is NOT conductive. The already failing 375mA rated fuse and surrounding area was hot and by putting cold IPA on it, caused a thermal shock that caused it to go open circuit.

[@Fifury161]

Thermal shock is likely as is mechanical stress...

[@hamdzuii]

the PP component is a PTC fuse, It increases resistance as the heat increases. When you inject the IPA, it also means you cool it down, so the resistance decreases, the current through it increases and overloading the fuse next to it.

[@digihorse6730]

100% also Vince please watch your fingers do not touch your meter probe ends as instead of reading open circuit you will get your skin resistance indicated. I suspect the PP resetable thermal fuse was going intermittently open when you were measuring it.

[@biotrekker]

No one has the right to be rude to a man of your accomplishments.

[@Smmmile]

I just have this image of Vince combing through the house praying for something interesting to break. Sometimes even contemplating giving something a cheeky nudge off the top shelf to help get the ball rolling.

[@Mymatevince]

😂😂

[@themlotproductions]

Perhaps some sticky tack to held a small item on your mat might make things easier Vince.

[@willproctor7301]

100% Agreed.

[@steelcityreseller8170]

Ha! I was thinking the same thing! When his wife told him the toothbrush broke, I picture Vince doing a fist pump and screaming "yes!!!"

[@caslurjmmm]

Hi Vince. I'm a random dude from Brazil. Fortunately I do speak English so I understand everything you say. I really enjoy your accent and the way you explain everything. RESULT!! Cheers from sunny Rio de Janeiro! I'll keep watching your videos!

[@bernhar]

Outros brazucas aqui...

[@pedrofrade1183]

Hi Vince! Came across a video of yours and now I can’t stop binge watching your channel! Thanks for teaching us and helping keep devices away from landfills! Cheers from Portugal

[@ralphj4012]

Well done. I believe the item marked PP is a resettable polymer PTC fuse (Bourns MF-PSML300), available from Farnell et al. Many operational explanations on Interweb. 99% IPA is typically 1% purified water, though there are some dubious suppliers. Such a high resistance has very little effect and many repairers use it as a poor-person's infrared camera.

[@JAYG6390]

For me, your videos are worth watching for the discovery of the issue. Yes, the fix itself was fairly straight forward but there were plenty of interesting little bits you discovered to get there. Keep up the great vids Vince. Love them :)

[@6581punk]

I had an Oral B toothbrush that I replaced the battery in three times. Lasted about 14 years as a result. Still works, but it was looking a bit tatty so I got a new one.

[@hadesmcc]

FWIW, you can easily take off the bottom end by placing the toothbrush on the charging base, pressing down and grabbing both the base and the bottom end and tilting the brush. It's really easy. It's much harder to remove the top insulation ring.

[@Knightliner69]

yes, that‘s true. That’s the way to open the bottom quite easy without any tools 👍

[@golimonkey]

Hi Vince, resistances of 1M and higher are considered as complete insulators up to 1000v, you wont damage anything with 1M ohm connection let alone 5-6Mohms. It was something else that blew it. Love the video ❤

[@greendragonmakerspace]

The IPA resistance is in the Mega Ohms, it also looked a bit dirty which might affect the conductivity. Mega ohm resistance won't affect much and certainly couldn't blow anything. :)

[@robertweiss4171]

I was pretty sure that IPA wouldn't cause any issues as I've used it to find hot components and also seen many other creators in this field do the same. I had to test if myself and found that it was around 20+ Mega Ohms.

[@flibble666]

^ what this person said ^ Here's the science bit for those that want a in depth answer . "Isopropyl alcohol is a polar solvent, which means it can form hydrogen bonds with water molecules. This makes it non-conductive in pure form. When isopropyl alcohol is mixed with other substances such as salts or acids, however, the resulting solution can become conductive. For example, when salt is dissolved into a solution of isopropyl alcohol, the salt molecules will break up into ions, which can carry electrical current. Similarly, when acid is added to isopropyl alcohol, the acid molecules will ionize and create a conductive solution. In conclusion, isopropyl alcohol itself is not conductive, but it can become conductive when combined with other substances."

[@eathenalexander2836]

As long as it’s 99.9% ipa it’s safe

[@scottdietz4683]

While checking resistance with your meter do you have your fingers on the metal part of the probes?

[@letsfixitgarage]

Hi Vince! When I saw this video recommended by KZbin got a real flash back to the few years ago :) thanks for the initial recommendation of my channel and thanks one more time for mentioning it again! I must say the whole video I was thinking what I will write in the comment and the whole time I was "complaining" why did you not made your research!!! You could have saved so much hassle.. but you are right what you learn on your own mistakes stays much longer. That said I believe your toothbrush is still in danger one thing is that you put the rubber case part under the plastic ring afterwards, this compromises water tightness strongly, other thing is the hole in the bottom cover.. it is ventilation hole but with a membrane (for small amounts of water condensate to escape) now your toothbrush has a hole in it where water can easily enter.. and these brushes don't tolerate water as much as philips toothbrushes do.. motor corodes and not much can be done there.. so check eBay for some dead genius brushes just to get the bottom cap, and revive one more motherboard as this defect is really wide spread :( I started repairing Philips and oral-b toothbrushes for People locally and was overwhelmed with request for repair.. this made the tall on my KZbin channel as last video is almost one year and have tons of material that I have filmed but can't find the time for video editing and uploading.. anyways thanks for the good memories and keep on learning!!! Cheers

[@Mymatevince]

So sorry I have only just seen this message. I'm really happy you watched it and even happier to hear that you are repairing them for people locally, I hope that is a profitable venture for you and an added bonus is keeping the toothbrushes out of landfill. Cheers for the tips on keeping my wife's toothbrush waterproof, I appreciate it. Keep up the good work 👍👍👍👍

[@rossewart9302]

Thanks for the videos. You, Joey Does Tech and Tronicsfix have inspired me to get into all my broken guitar pedals and get em sorted. Love the variety of stuff you tackle!

[@flatman9]

Great watch as always. Think this is a common fault as my brush (same one) is just over a year old and looks to have same fault. I won't be able to fix mine as I don't have the equipment but it's ridiculous that brushes costing that much go faulty so quick with the same issue 😔

[@ray73864]

My 2010 Oral-B was awesome, that thing lasted from 2010 right up to 2022, only reason I had to replace it was because the battery was degrading, and the rubber grips had all but completely worn off. Bought my new Oral-B in 2022 (Looks identical to your wifes one but is black). My 2010 Oral-B, you could open the base very very easily, the plug had a little bumpy bit on it that was designed to fit into a hole in the base to turn it (sorta like an allen key), you kept unscrewing and eventually the bottom came off. The other nice thing about my 2010 one was that the charging base had a holder for all the toothbrush heads too. Still, I do like this new one, battery is still going decently strong in it, lasts about a week to a week and a half (Almost a fortnight, almost!).

[@digihorse6730]

Vince always keep your fingers off the meter probe ends as instead of a component showing open circuit it will show ‘your’ skin resistance.

[@FiveStringCommando]

I bet Mrs. Vince is thrilled to have her toothbrush back

[@mjrdainbramage]

The thumbnail was just perfect! It really put a smile on my face, so thank you Vince. Happy Easter!

[@Mymatevince]

😂 Thank you, Happy Easter to you too 👍

[@NRE333]

Vince do you want a Phillips Sonicare 9900 Prestige? It charges fine and the motor works. However the brush head doesn’t properly engage. I’ve been considering throwing it out. It’s yours if you want it!!

[@jimo2983]

The motor pause at 29:59 is the toothbrushe's timer. It tells you when to move to a different quadrant of your mouth. This is a feature and not a problem.

[@peterjones2411]

I think the pp is a PTC fuse and thermal shock could have been the short however that little chip could also have an oscillator running at several MHz and capacitive loading by IPA could have caused the oscillator to lockup and caused an internal switching transistor to latch on blowing the fuse. most things become conductive and capacitive at high frequencies

[@Msound500]

🤩❤️ Great video, think this not the conductivity of IPA but the temperature drop make PP reset pass current into E fuse and blow then suddenly Stay mysterious why originally PP fuse might be faulty by time bc never reset for too long little bit like a switch contact melt on surface ( here microscopic size )

[@hadesmcc]

22 mins in, so far, same fuse as on mine. That SMD with the PP lettering is a Bourns fuse. It is resettable.

[@DaMu24]

A Bourns fuse?

[@hadesmcc]

@@DaMu24 It's the name of the brand.

[@heinrichfelder1849]

Bourns MF-PSML300 PTC resettable fuse maybe...

[@hadesmcc]

Haven't watched the full video yet just heard you describe the issue, mine had this problem multiple times. I keep having to replace a fuse, always the same one. Leads me to think there's some issue somewhere else that makes the fuse die over time. I'm curious to see if your issue happens to be the same and if you've figured something more about it than I did.

[@christhomas7905]

Just a thought on videos when you're measuring ohms... I noticed you touch the ends of your probes when testing which would affect the reading as its goung through your body. If you touch both leads with fingers on either hands you'll get a reading, so not sure if that plays a factor in your measurements.

[@gendragongfly]

The component labeled 'pp' is likely a Bourns MF-PSML300 PTC (Positive Temperature Coefficient) resettable fuse. Meaning the resistance goes up as it heats up. Additionally, the person that said IPA is conductive was either not using Pure IPA, or more likely was just being an ... Yes, even pure IPA is slightly conductive, about 20 Mega Ohms over distances less than 0.5 mm. However this does not electrically influence any household circuits because even at relatively high voltages like 400v or 600v and short distances like 0.5 mm, this will result in only 0.1 mili Amps of current flowing. This is also the reason why Mega Ohm resistors are rarely used in household electronics, aside from some exotic speciality applications fractions of a mili Amp are just not useful for most electronic applications.

[@tim0steele]

Very common fault on the 3771. I wonder if Oral-B got a bad batch of fuses? Mine had other issues so I fixed it by buying an old but working 3771 (wrong colour) and swapping the guts over.

[@ianhuxstep211]

In answer to the IPA conductivity issue. I repaired a high end power supply, replaced a component in the PFC Circuit but the IPA hadn’t completely dried or evaporated. When I switched it on it took out about £100 pounds worth of components. I was not happy as the unit worked but just needed a cap changed for preventative maintenance.

[@kasamialt]

IPA won't conduct a huge amount of power and blow anything directly but it might conduct enough to mess with something sensitive like a mosfet gate and switch it on when it shouldn't be. The square thing next to the fuses looks like it could be a mosfet. I don't know why that would blow anything either in this case, unless it's part of a switching regulator circuit on the other side.

[@Pulverrostmannen]

That PP component is very likely a PTC Thermistor put in series with the motor made as a overload protection. it is meant to have a certain resistance and the higher load you get the hotter the thermistor gets it will raise the resistance and reduce the current through it. it is the same way a re-settable fuse works. the PTC enters a avalanche state where the thermal state heats it up enough to start increase resistance and the extra resistance increases heat which increase heat even more and you get the point. these PTC components can´t cycle endless amounts before they eventually fails

[@keithnsearle7393]

Another very good fix. Nice and re-gnashering.

[@SardiPax]

Even (pure) water isn't very conductive, let alone the small quantity in IPA. Organic, non-polar solvents (IPA) do not support the flow of electrons easily so can be considered non-conductive. I suspect the PTC device was damaged (further) by absorbing some of the IPA (possibly because it had already started to delaminate). I imagine the PTC device is to cut off the power if the toothbrush is left on for too long (so it is intended to heat up over time). When the faulty PTC device was exposed to IPA and possibly absorbed some, it may have briefly gone S/C and thereby blown the 'E' fuse.

[@TrueBrit1]

As I'm walking down the street, some guy comes out of a small workshop and says to me "hey, wanna come and watch me fix a kitchen blender?" and I reply "WTF - are you mad, no of course I don't, so p1ss off!". Vince uploads a video of himself fixing a kitchen blender - me rushing to my PC to watch, grabbing some crisps on the way.

[@TheDefpom]

For an item to heat up like a fuse or resistor it needs a higher resistance, think of Ohms law, the lower the resistance the lower the heat it will dissipate as there will be a lower voltage drop across it for the given current, I x V = P so it actually works the opposite to what you would expect.

[@tollietime]

IPA can be conductive but it's minimal, however, it depends on what it interacts with, bits of solder or metal dust etc can make it conductive at that point.

[@ErrorMessageNotFound]

Test the IPA in a clean container. Contaminates affect the conductivity of a liquid. I would guess the PP fuse is for the motor and the E fuse is for the electronics. Also, conductivity in the several meg ohm range is just this side of nothing. You'd get a similar reading testing the skin on your hand.

[@MultiVoiceofreason]

All the smds marked pp I could find are different types of diodes from zener to TVs diodes not a fuse my guess is their using a zener as a cheap as voltage regulator

[@EersteMinister]

How timely Vince. I have the same brush and it failed yesterday with exactly the same symptoms. This seems to be a frequent fault in these Brauns.

[@cyberhornthedragon]

pure ipa is not conductive but it like most alcohols draws in moisture from the air it gets slowly more conductive over time (which is why older gas engines their fuel tanks and components suffer a lot of rust from the newer alcohol containing fuels ) for testing a flux powder would be safer components that heat up will melt the powder quite fast

[@kazarenko6300]

My wife's toothbrush did exactly the same at the same age - hoping there's a fix!

[@stevewaller6577]

same for me last week used IPA to clean battery connectors on an apple trackpad, left it to evaporate and the unit was dead, tried again next morning, powered up again, sadly unit was still unresponsive to touch despite connecting to the puter.

[@timowallin8020]

Not sure if it's the camera angle. But it looks like, you do the first mistake they told as at the school not to do, when you measure something with DVOM. Keep your hands(skin) away the leads(metal parts) and or the part you measure.

[@andymouse]

My thoughts too.

[@lezerb]

Especially when measuring resistance

[@braddofner]

Finally a clickbaity thumbnail that celebrates its clickbaitedness. What a champ, Vince. Loved it!

[@Mymatevince]

🤣🤣

[@aleksandersats9577]

I have a 14 year old ORAL B electric toothbrush and I've used it regularly. It's a very impressive toothbrush, I haven't replaced the battery at all in it's lifespan and the battery still lasts a week before it needs a charge! This is why I like NiMH compared to lithium. Sure it has less capacity but it lasts WAY longer.

[@TylerDurden-pk5km]

Lithium batteries can last very long - of course with some degradation in performance, the same as with NiMH.

[@aleksandersats9577]

@@TylerDurden-pk5km My experience is way different. With lithium the batteries fail with that they can't deliver enough current, won't keep a charge, get too hot while charging or too low of a capacity. With NiMH you can forget about it for years and even if it reaches 0v, it won't really degrade as badly as lithium would. Heck for safety reasons you shouldn't even use a lithium battery that got too empty. NiMH batteries can be abused and they will work fine, not so much for lithium on the other hand. NiCD can be even more abused than NiMH. For reference, NiCD best storing voltage is 0.6v - 0v. 0V meaning completely empty. And NiMH quite similar to NiCD. Also here is a fun fact, NiCD is currently the top holder for the fastest charging battery technology out there besides super capacitors which shouldn't really count as a battery.

[@TylerDurden-pk5km]

@@aleksandersats9577 Unfortunately I can not attest to the robustness of NiMh Batteries - only had bad experience with them in power tools or other high current applications.

[@joshkelly4682]

I paused your video and did an experiment, i used 4.5 volts and an led from an old pc. I ran the led positive wire straight to the 4.5 volt power and ran a wire from ground of the led and a wire from the negative on power supply, i exposed the wire on both ground wires and filled the lid of my ipa and filled a drink bottle lid with water, when i dipped both ground wires in water the led lit up, but in ipa it didn't do anything. Hope that helps you out

[@perkulant4629]

99% IPA is fine Vince. I’ve drenched boards with it in the search of shorts before. Never had an issue.

[@eddy42109]

Hi Vince, another great video. I am not sure, but I think the PP component is possibly a Zener Diode holding the voltage constant. I can't see a fuse securing another fuse....

[@tempestfrost]

Hi Vince! Long time viewer from Canada here where I've been employed as a chemist for the last 29 years. As such I can assure you that Isopropyl Alcohol is NOT conductive. IPA is an acid. And while it is true that when you dissolve an acid in water it will dissociate into ions which ARE conductive, because IPA is one of the weakest acids around it does not separate into ions when dissolved in water. It is the ions in water that makes water conductive. Since you're using 99% IPA I can assure you that you have nothing to worry about. IPA itself is NOT conductive at all. I'm not sure who this rude person was who claimed that IPA is conductive but you can take my word for it, it is not. Hope this helps. ♥

[@Mymatevince]

Thank you 👌👍

[@fialee8]

I have used Braun Oral B for decades. I have the older style with a larger battery, which no longer holds a charge (does not have an indent on the bottom). The newer one you have has the indent on the bottom has a much smaller battery. It will be interesting to see how to replace the rechargeable battery, as I assume that's going to give up the ghost next.

[@marksapollo]

Right pain to fix these, good effort.

[@erikhyernielsen4684]

Hi Vince, i very like your videos keep up the good work, IPA and water (distilled water) are non conductive liquids in their pure forms,,but when you add another chemical like salt or lets say flux it becomes a different matter, that's why you should never use liquids on a live circuit, your test with the cap of a bottle doesn't prove anything other than the liquid is contaminated. hope it helps? best regards from Denmark

[@Mymatevince]

Thank you Erik 👍

[@mitchyk]

If it's 100% IPA it's safe as far as i know but if it's less than that the impurities will conduct current. So check your bottle label! Also if it's purely for finding out which part is faulty use a cotton bud to dab it on components in the area as this won't conduct anything if it's just a blob on the top!

[@mrjsv4935]

Interesting fix. Had myself a Braun Oral-B type 4728 between 2006 - 2022, and was recycled because the battery didn't hold any charge anymore. I guess it could've been replaced, but decided to buy new battery operated toothbrush instead. Took the old one apart, saved the motor which has good metal gear in the axle, and few other parts too, recycled the rest of it, including the charger. When I took it apart, managed to destroy the charging coil, so that was the thing that doomed it. Now I wish I would've kept the pcb as well, as it was otherwise working ok, could've had some spare components there.

[@sdjmchattie]

Seems to me like the PP fuse was partially broken and increasing resistance. The motor was receiving much less voltage than it should as a consequence. Because the two fuses split the current between them but the PP side was not connecting, that put more load on the E side. That fuse was heating up as a result and you saw it when it went pop. Seems like a design flaw to me that one fuse playing up causes the other to blow.

[@logothaironsides2942]

The guess is that most liquids are conductive but alcohol dries off on its own and so is better for cleaning electricals. Good work on the mend, those things are pricey. I dont know if they all do the same but my toothbrush lasts ages between charges so the battery itself should last years before its chargeable life is through.

[@guidomersmann9744]

I used to clean retro computer fans by submerging them in IPA, while powering them. This not only cleans the fans, but also creates a nice table fountain. :D So unless the IPA is not contaminated it is not really conductive. Would be in the mega ohms.

[@TylerDurden-pk5km]

The small fused was blown, because you cooled the resettable fuse with IPA thereby sabotaging it and making it no longer limit the current. The protection in resettable fuses relies on them becoming and staying hot.

[@Martyn-ey9lw]

What you need to replace the fuse is some of Sorins "specially calibrated wire", Electronics Repair School

[@rogierius]

Just found out about Sorin's channel. What wire is that suppose to be? Just a thin one?

[@pwrgreg007]

@@rogierius I used 30-gauge wire-wrap wire (for the PP fuse). Unit has been working now for over two years.

[@ErrorMessageNotFound]

Also, if you use your bench power supply you can test how much current it takes to "blow" that tiny tiny wire (at 5v). Then at least you will know how well it can work as a fuse.

[@zincmann]

SO I have the same Toothbrush it does that like stutter at around 30:00 because its counting up every 60 seconds. Normal operation Vince.

[@alanr9496]

Why is there a PP fuse and an E fuse in series? Is PP realli a fuse?

[@Old_Man_Pete]

Interesting to see with IPA, have you tried the conductivity of deionised water?

[@TheSkaldenmettrunk]

Happay Wife - Happy Life. Nice fix.

[@thegodsonuk]

Hi Vince … could it that as the PP fuse is self resetting that it was resetting whilst you were trying to measure it?. Also, why not get a resetting fuse so that it shouldn't need to be replaced

[@mylogon341]

I wonder if the IPA caused thermal shock in the fuse, making it fail. If the fuses are ceramic, it could cause them to crack cooling with the IPA too quickly. Think how putting cold water into a hot glass can make it crack. I suspect the same thing might have happened here when you doused IPA onto a very hot fuse. If the vibrations are causing these (ceramic?) fuses to crack, it might make sense why people can push on them to rejoin them internally again, if the damage is microscopic. Also, if the fuse has cracked and is holding on internally by practically nothing, this will be causing huge resistance, which explains the heat build up. Thinking on this further, maybe this is why your resistance rating were all over the place - as you were pushing your probes together, you were maybe rejoining the internals of the fuse with varying success.

[@Mymatevince]

Very good thinking. I'm not sure though that the smaller secondary fuse (E fuse) would have built up enough heat especially by the time I got the IPA out to have thermal shock. I did also put my finger over a lit LED just before it stopped working, I wonder if I could have caused an unintentional short to blow the little fuse???? Unlikely I would have thought. The pressure on the leads though makes complete sense, well spotted. I wish I had kept the faulty PP fuse as I could have soldered leads onto it and then seen if the Ohm reading was still jumping around. Well done on coming up with that theory, I think you are 100% spot on 💪👍👍👍

[@joshkelly4682]

That would be very rare though but not impossible, so it could happen

[@TharkysOlafson]

I'm no expert, but I think the conductivity depends on how pure the IPA. Similar to how distilled water is not conductive, but tap water is. It's the minerals that make the tap water conductive, whereas distilled water has no contaminates so it is non-conductive. The IPA could have some contaminates straight from the manufacturer. Another thought is that when you floated the IPA across the components, it picked up some contaminates that were on the board.

[@GFY_FOAD]

Isopropyl alcohol isn’t conductive in its pure form. But it can conduct a very small amount of electricity as a 70% alcohol-water solution. Pure isopropyl alcohols have covalent bonds. Hence it can’t ionize itself to lose free electrons. So, isopropyl alcohol is electrically non-conductive. Compounds with ionic bonds tend to break into ions when dissolved or melted. But covalent compounds are deprived of this property. The absence of ions deprives the covalent compounds of carrying electricity/charge. Most alcohols have covalent bonds in their atoms.

[@Drew-Dastardly]

It's also kind of irrelevant in this scenario as it was fuses that went which are by definition highly conductive. Adding a parallel 1-10M Ohm is meaningless here, and even the overspill to other components is nothing at such low voltages.

[@Drew-Dastardly]

A lot of ladies working away stuck in a lonely hotel room get bored. They need a little more than 3 minutes of toothbrush vibrations to relieve that boredom. Toothbrush overheats and fuse blows. The upgrade from an E to a K fuse is probably good. Just saying... 😉🤣

[@EmeraldHill-vo1cs]

Exactly what i was thinking. I mean a bit of a coincidence.

[@nigelholland24]

Changed about 4 batteries at our repair cafe. On toothbrushes very delicate

[@snafu2350]

Pay attn to your multimeter! The IPA reading had the decimal point to the far left, while the water comparison was one step to the right (I didn't catch the actual ranges detected), indicating that the water's (tap? distilled? deionised?*) conductive resistance differed by at least a factor of 10 * An interesting & quick experiment to conduct: check resistance values with your local tap water compared to deionised, distilled, mineral & sparkling: you may be surprised by the results! If probe testing SMDs on your mat, be sure to clean at least that area of the mat thoroughly first to avoid debris/contaminants mucking up your readings (or use a clean sheet of paper?) To replace most 'rubber' seals easily, drop it in boiling water for a minute or 2: this'll soften it up without risking scorching from a hot air gun

[@SecondHandDIY]

look at the lable on the ipa as well see how much water was added i noticed some ipa is cut with water

[@user-mgc]

Glad to see Vince is starting to appreciate the hidden dangers of excessive isopropyl alcohol use, the IPAA meetings must be working...

[@dahger7]

Great videos as always. I need to repair one of my tooth brushes also.

[@Phiyedough]

I've never found it much of an ordeal to use a manual toothbrush! Still interesting to know more about how these things work though.

[@Twenty_Six_Hundred]

Women dont use them for brushing teeth lol

[@arielvilla956]

As the circuit was "live". I think it was mostly likely you've shorted something with the brush (metal parts on it) instead the IPA.

[@colinfielder6695]

8:20 there was a double flash from the light, what would have caused that?

[@DankerTVTimeCapsule]

honest question to ask Vince. Nothing in my opinion is embarrassing to ask.

[@rf159a]

According to Google IPA is NOT conductive at the percentage you use. But they recommend to let it dry before applying power. So who knows??

[@Old_Man_Pete]

Google is not always your friend, I googled my name and apparently I died 3 years ago lol.

[@aleksandersats9577]

@@Old_Man_Pete That's because there was another person with the exact same name as you who died. I have had the same thing.

[@Old_Man_Pete]

@@aleksandersats9577 even the same middle name lol

[@cyanide_breathmint]

Every time I see Vince using a toothbrush to clean something horrible, i always seem to remember him saying "just using my wife's toothbrush to clean this up". Anyone remember what video that was from?

[@dutchtiger2871]

I don't know about IPA, but at work for a Leak detection system we were curious to see if Alcohol ( in our case + 70% rum ) was conductive, and we were able to pass a signal through a small droplet with out the wires touching each other, so while Alcohol is mostly non conductive as the internet says, you can still get electricity through it, I'm guessing it's through the other small percentage that might have small amounts of conductive minerals floating inside that the electricity jumps between. But I'm no expert either, just something i found out while doing some tests on my own.

[@nigelholland24]

You use the Charging base to remove. Heating in warm water in a cup then put on base and lever out.

[@gamingit1]

Im not sure but i think that it could be varicap (that samd component labled E)

[@johnhermann762]

According to a Google query, 100% IPA is non-conductive. But most IPA has some water in it and will cause the solution to be conductive. IMO, the reason the fuses blew was due to the motor degrading over use/time causing more of a load; so replacing with a larger fuse will compensate.

[@TheDefpom]

Conducting from IPA is likely to be from contaminants rather than the IPA itself.

[@cuthbertsdownundacuthbert8091]

Vince, the thing turned off when you touched it when you said can’t see it because of the light. So i think your finger shorted it out.

[@Mymatevince]

I did think the same thing when editing, my finger went across both sides of the little LED 👍👍👍

[@phillangstrom8693]

ipa is slightly conductive the lower the alcohol percentage the more conductive it will be from the water content even though it should be distilled water which has low conductivity but you never know with cheap ipa it is possible the fuse was already bad and the ipa leached into a crack and compromised the fuse do to electro etching from the battery voltage

[@intoxicode]

Depends on the water concentration in the IPA, IPA itself is not conductive. However most IPA concentrations are 30% water, with 99 being 1%..

[@matteo_z]

26:21 I know it sounds dumb, but given that both fuses were givind the strange results, it may be because you were touching the metal part of the leads. A good example, is the risk of electrocution when you work with HV and no protection. If you want to try a cool experiment, take the oscilloscope, leave the ground dangling, and touch the probe's tip, you should see a waveform (I have an old 30+ year old scope, and I do).

[@willmorici5765]

Hey Vince, I'm curious...when you hit 1M subscribers, what big announcement/project are you going to take on? I mean, it's gotta be bigger than the Cheapest Rolls Royce in the UK, right? Cheers mate!

[@mikehibbett3301]

You can buy a freezer can to look for hot spots. Been using that since the 1980's

[@mathiasnilsson7996]

Hi, what is CPC you talking about

[@pauldavies6037]

a PTC device is a positive temperature control device see other comments below.Even electric tooth brushes are full of tiny electronic parts well done Vince glad I dont repair any thing any more

[@frankm1frh525]

hi Vince thought this would help buddy Isopropyl alcohol itself is not conductive. A 99% or even 70% alcohol/water solution will only be as conductive as the water portion, inhibited somewhat by the alcohol. It is conductive enough to worry about, though, so don't run the electronics involved until they're completely dry.29 Jan 20

[@Stubear22374]

It’s amazing what runs a tooth brush I mean I thought it was a battery a Motor and a switch didn’t realise there would be so many chips and motherboards

[@bodibmf]

Moved to Sonicare:) used oral-B for about 20 years and Sonicare is much better

[@AmbroseClarke]

Mine went just like this. Wasnt holding charge. same model. Thought battery failed- Had recharge it daily. Turns out I was simply plugging it in on the 110v side of the bathroom socket. They need charge at 220v. 😂 Working perfectly again on 220v side of wall adapter!

[@pwrgreg007]

You should use the socket that fits the charging adapter. Here in the USA it's 120V. And I replaced the PP fuse with a short piece of 30-gauge wire-wrap wire. It's been going strong now for over two years.

[@AmbroseClarke]

@@pwrgreg007hi, in Ireland/UK, our shaver power points in bathrooms often have two 2 sockets. Bathroom devices like toothbrushes and shavers often use two round hole sockets (unlike rest of house which are always 3 squarish hole sockets). When there are two sockets one is 110v and one 220v. in my experience, they are not always clearly marked

[@pwrgreg007]

@@AmbroseClarke I wasn't aware that 110v was used in the UK. I thought it was all 220v wired in a "ring". Most homes here have a center-tapped transformer so we have two 120v legs out-of-phase (neutral center-tap) that can be used for 120v or 240v.

[@AmbroseClarke]

@@pwrgreg007 Its all 220v throughout house here - but often you get a very small transformer built into some bathroom fittings, like on a mirror light - no idea why its a thing as few people here have 110v devices - but often seen in hotels, which would make sense there to support visitors bringing their shavers. Only other place I can think you might see 110v is sometimes on building sites - where they have to use big transformers to step down the voltage for industrial drills. The other voltage that is more a business/workshop thing, but becoming more a premium option lately in European houses, is 380v (3 phase) for charging electric cars quickly.

[@pwrgreg007]

@@AmbroseClarke Good to know, thanks. With USB chargers typically able to handle 100-240 VAC, and everything going on batteries, we may not need to worry about power sockets in different countries much longer.

[@pds8475]

Pure IPA should not be electrically conductive however there is a small amount of water in it. Hence the percentage. Still on low power equipment it's resistance of 99.9% IPA should be more than enough to stop the electricity. However IPA is thermally conductive and can cause thermal shock to components that are already hot.