Відео

Check the comments for processor reset procedure or simply remove battery negative terminal from motherboard for a minute. This should reset it as well..

Look for the comment from @pwrgreg007. Find the microcontroller above the white cover for the LEDs. After grounding that copper pad at the corner clockwise from pin 1 connecting to the reset_pin (35) using your multimeter in continuity, toothbrush will work again.

Check the comments for processor reset procedure or simply remove battery negative terminal from motherboard for a minute. This should reset it as well..

@@letsfixitgarage Thank you again, you are amazing!!! After searching through the comments I found the relevant comment from @pwrgreg007. After grounding that pad at the corner clockwise from pin 1 connecting to the reset_pin (35) using my multimeter in continuity, toothbrush worked again.

This one is a little bit more difficult.. it's NiMH battery and it has different charging pattern. Even if you install a fully charged battery it will do the charging procedure for few hours.. but it should start at the press of the button.. I would try to change the battery for a new one (the same type!) if this doesn't help defects on motherboard needs to be investigated..

Could be battery. Try measuring battery contacts and see what voltage is present.

It could be that magnet has separated from the shaft. If it's still on the shaft try to remove it and glue it back in place. But it is difficult to get the hight right as if there will be to much glue tha magnet head will stick out and vibrations will be not right as well..

Try submerging the bottom part in water for short time and work it back and forth. It seems there is toothpaste build-up that sticks it shut..

@@letsfixitgarage cheers, tried that and did not work but will try again ... don't want to try pliers as will break !

Leave it in water for longer but I would not submerge benearh the hole with ventilation filter. It's not designed to be 100% waterproof for long time submersion..

Glad this worked for you but consider changing the fuse.. much more reliable aproach in electronics repair ;)

Have you replaced the fuse or just pressed on it? Maybe the initial problem returned..

I believe it depends on how much it was tried to turn on when it got stuck initially that affect the stick level.. as every time you press the button it welds brushes to the rotor even further.. thanks for your sharing!

Not every video is a perfectly cut and 100% correct information.. I see so much more electric toothbrushes repairs after my videos with misguided information, but you are right this video is poorly made as it was first of its kind at the moment of release. Was to excited to bring the info out :)

Thank you, I have modified my comment accordingly.

Thanks! I'm not afraid of criticism as this helps to improve, sadly there is no possibility to improve the same video with better footage only to release a new one but this would duplicate the same information.. but I need to get back to uploading more videos as I have postponed it for quite some time..

There is more in learning then just reading/watching a summary in 20s :) and if you want to repair more of different things you need to learn different techniques and different approaches in diagnostics :) don't have anything against fast learning but diagnostic is an art in itself ;)

@@letsfixitgarage while I agree with you not anyone is interested in watching whole thing, they just want to fix their broken toothpick quickly :D

@Skovorodnikof that's the problem.. everyone wants a 5 min fix and looks even into crazy examples.. let's say someone reads this comment and the most popular comment suggesting to push on the fuse with a screw driver without further checking what this affects.. with that you remove a safety option and if motor gets shorted your toothbrush, or toothbrush of a non suspecting loved one, could get smoking or even catch on fire depending on conditions... Now let's say you are not there to calm everyone down and this happens in America where everyone likes to Sue everyone.. how would manufacturer use this agains right to repair movement.. as said I'm not against fast fixes but we need to keep repair safe and this works only if you know what you are doing, so keep on learning!.. and then on the other side we have people who want to see everything and complain that something is not in the shot for 10s :)))) thanks for your comment and sorry for making a horror story out of it :)))

@@letsfixitgarage lmao that's alright, good day to you

Sorry didn't had this defect yet.. for some reason people don't bring me any of the pro series for repairs only genius, IO or Philips.. maybe new price is not that much so people don't want to repair them...

Check comments there are comments explaining how to reset the MCU. Or simply remove the battery power for a minute and it should get back to life

Everything breaks but I like Philips multiple brake points as this means every unit can be used for multiple spare parts and not like in oral b iO whole drive unit needs replacement if you drop it on the head :) but yes I have some of Braun repairs in my video as well ;)

Replacement is done by soldering I believe in some of my videos you can see me doing it. Definitely there is one for oral b fuse replacement that I show. As for the fuse itself look for similar measurements 2a fuse and you should be fine. There are some links in video description but they are quite old.. but still maybe you will see their specifications..

Not 100% sure but I think in band there are antennas and charging is wired to the back side of the watch so it should be fine for charging

In the back it should have an Ventilation filter if it was broken at some point then it's vulnerable to water damage take it apart fry it and look for water damage. Not fun part is that mostly water damage is on the back side of the motherboard and screen is very vulnerable to water as well..

I was poking around measuring what I thought was a current-sense resistor but I'm not sure. The unit is now working. It could be that I reset the MCU somehow, or it just reset itself.

I have never used the Bluetooth on this toothbrush. Is it punishing me for that? 🙂

I got some more information on the Oral B 3771. The MCU is the Texas Instruments CC2640R2F running on 3.3V. Reset is on pin 35, but there's a pad you can ground to reset it. Look for the pad near the corner clockwise from pin 1. By grounding this pad, I got it working again. The data sheet is available on the TI website. Pretty impressive chip! Bluetooth capability is built into this MCU. 3.3V can be measured on the pad to the right of the fuses. The board's build date code is above this, along the top edge, next to a lower-case "c".

Yes that's exactly why I recommend replacing it with a fuse and not short it or press on it.. thanks for explaining it to people who reads comments. By the way answer to your problem is between comments as well :) some other commenter has found out the pin order on the MCU as well and shared it with the public ;) thanks for repeating it again!

@@pwrgreg007 your detailed comment coupled with some googling saved the day! Thank you so much. Happy new year to everyone here!

difficult to say.. I like Philips for having more exchangeable parts, but prestige is very difficult to get as spare part and if you get water inside you are screwed as it will damage electronics that is glued to the housing and there is no way to get to it. both will hold long if maintained correctly. both afraid of dropping (seen IO with cracked plastic head part and water gets through it inside of the toothbrush) one more thing that I don't like about IO is the toothpaste assembly inside of the plastic head, difficult to clean.. So my preferred toothbrush would be philips expertclean 7300 has everything technology wise, easy to clean and is possible to repair :)

@@letsfixitgarage i had prestige for more than year and no problem at all. Just bought iq 10 so let see how will be iq for long period

I think I replied to your email :) but yes testing it when cover is off you can see where the leak is and then try to examine that part.. just as info for someone who would be going through comments :)

@@letsfixitgaragetried but it still has issue. Can I take a video and show you

that gives quite a perspective on savings if assumed that every 10 viewer saved this amount :) nice!

have few of those but didn't had a chance to examine further.. the y lay in the "to do" box but I think my impression was that there was water damage and some traces on the back side were damaged.. but you need to completely disassemble the board to get to the back side.

Mine was stuck on the language selection screen. The on/off button wouldn't select. I downloaded the app and paired it to the toothbrush. I was then able to change the settings and the toothbrush worked as expected. Mine was probably a software glitch, rather than hardware issue.

you mean blade in the replaceable shaving head? would be difficult to find new ones.. or what was your question?

@ sorry I didn’t explain it a little better. Can the blades inside the shaving head be taken out and replaced with new ones was meant to be my question but I took mine apart and it’s not made to be opened. Once you open it you can never close it again. It has welds that permanently close it off and very sharp edges that can easily cut your fingers if you open it so beware. New head was $50 from the shaver shop and it lasts for a very long time anyway cheers ✌️✌️

Thanks for comming back with explanation!

thanks for the tip! really appreciate it. as for opening it, there is another method of compressed air (6-8 bar) injection through upper seal (but you do have to destroy the seal) then the bottom cap pops off. in "defense" of my method its non destructive and leaves no traces if done right and with some experience ;) good luck and thanks one more time!

my guess would be water inside and damage is starting to influence its operation.. but you can check this only by opening it and if water damage is there only skilled soldering can help.. check my other videos with water damage repairs..

every repair has this chance sadly.. but you did learn something ;) try to look for a donor and maybe with two you get one working!