Thats fixed my toothbrush, now to do the wifes. It needed heating up and rubbing with cloth to clean. Thx for ANY helpful ideas (i also checked all internal components) I was able to replace the battery without disconnecting either the coil or the pressure wires. And,, as somebody already said it is a step against this throw away world to save the planet. Carefully unclip it from one side, then the other: Time to get your soldering iron warmed up now! I would however suggest the better way to trim the new battery terminals would be to cut down the width from the end before cutting across, as indicated in the guide. Speed seems fine on first use after full charge. But all working fine :-}, This is great, Very clear instructions.thank you. If I then leave the toothbrush on the charger under this condition, then the pressure sensor light wont flash during the charging process, and the battery is also (interestingly) able to reach fully charge. Just posting this here in case sombody else has the same issue. When the battery is temporarily replaced with a spare or even just turned around and inserted back to front you can see how the battery comes up against plastic spacing stoppers (arrowed below) which prevent it from sliding up any closer to the motor. The charger works with another brush. I checked and resoldered where the + battery connector is on the side of the pressure connector soldering. Only when pausing longer than 30 seconds the timer resets to the initial starting point.In the first days of using the toothbrush, your gums may bleed slightly. But still enough power to keep the pressure sensing light flashing. So if any intrepid souls get everything to work but are stumped by motor straining (but failing) to turn the cam / linkage, hopefully this may help. Sometimes it takes up to an hour before the toothbrush even acknowledges that its charging! The original symptom was flashing red light (pressure sensor light flashing eg. Oh . No problems at all, just takes a bit of time as it was the first time. The only issue I had was when de-soldering the de-solder pump plunger cap flew off and it took me 25 mins to find where it actually gone, found behind a picture frame on the wall on the other side of the room! Chichester Hi. Any idea whats causing it? What a fantastic guide! But after a week, the battery would become drained, to the point where the motor would no longer operate/move. I just finished installing your longer battery into our 3756. To start off, remove any brush heads from the top of the handle. Great instructions. I looked at the online copy of the instructions, but there is no info on a faster blinking. I would have thought that it is waiting for a charge since the red light is flashing. To the EU users, bear in mind some countries now you need to pay taxes upon package arrival. I dont see any loose components on the pcb, but I checked and the two pins to the motor are short circuited, and this seems weird, shouldnt the other one be plus, the other one ground? Thank you for this excellent tutorial. Any way to force start the motor to re-educate the battery voltage IC? I charge at full and lasted 10 days again, with the same battery, but the second cycle lasted 2 The toothbrush doesnt allow to charge the battery fully if you dont disconnect it from the circuit. Hi, I have the same problem after replacement it works but flashes red and is not charging. Thanks! Black & Decker Wizard or Dremmel. What are the general best practices to do with this kind of battery? That is, when trimming down the replacement battery tab to make it narrower, you should use scissors. Bravo! Keeping them in the range of 20-80% vastly increases the number of duty cycles, which applies for toothbrushes, mobile phones, & especially electric cars. The type number of your toothbrush is marked on the bottom of the handle. Can I reassemble my toothbrush without the pressure warning switch or pressure warning light? Thanks for all the useful information. Does the replacement battery has memory? I successfully rebatteried my wifes fancier Braun last year, so this is beginning to become a habit for me, thanks to Ionic. Just wanted to say thanks for the clear guide, and all went very smoothly, including the upgrade to a higher capacity battery. At the end of the charging, the green charging light will then cease to flash (which is normal). Hi Antonio, it could be a faulty battery but run through the checks on our toothbrush trouble-shooting page and see if that helps. I replaced the battery with the longer battery. Id suggest re-fitting the old battery and checking for shorts on the PCB a common one is the pressure sensor switch (if fitted) connection touching the positive battery connection. Thanks for a very nice guide. Absolutely fully charged. The most common place to get a short-circuit is on the PCB around the positive battery terminal (near the motor). I did not bother and had no problem replacing the battery. Many thanks for your guide. The electronics should now let you press the power button on the PCB and it will power up the motor. Just replaced the battery in our 2 toothbrushes. Stand the toothbrush tip-first in hot water (60 degrees C) for 5 minutes to soften the plastic and make the ring easier to remove. I must have soldered and desoldered, and then soldered back everything again 3 times and the battery and charger connectors maybe 2 times more. Weve a third one with a dying battery, I wont leave THIS one lying idle so long when its battery finally dies It took a little time but more importantly for me was that I didnt need to replace it in this throw away world. I also used the scissors on the knife to trim the battery tabs. No matter. Even the pressure sensor seem to work: The light flashes when a certain pressure is detected and is permanently on when the pressure get even higher. Carefully inspect all around each solder joint with a magnifier to look for soldering issues and re-solder any joints that look cracked. The red light didnt stop blinking (2 second On 2 second) off even I put it on charging dork. Well done. Molto bello, spiegato bene, complimenti. Locate the two solder points for the motor (arrowed below) and desolder them, bending the tags upright with a knife so they are disconnected from the circuit board. Check the area around where the pressure sensor switch plate is soldered to the PCB. I mean, the old one was 1600mAh. I charged the accu before inserting it, it had 1.35vbut never charged in the brush, only red blinking. No need to go glueing around the seal. For me, this was necessary as when I first replaced the battery, it still didnt work, but after cleaning off the accumulated crud, it did, so I guess the crud was shorting out between pins of the chip. The guide is perfect and describes all the necessary details. I have followed the directions to the letter, and everything appears fine. Just wanted to say thank you for the guide. Great stuff. I didnt need the solder sucker or copper braid, just some flux & the original solder which probably avoided a number of problems. I hadnt done any soldering since school and was a bit anxious that Id melt the pcb, but my tips would be to read through the guide in its entirety first, then if youre unsure about the actual desoldering process, watch a video or two on YouTube, and finally, just to take your time. We need more repair articles like this, very useful thanks! The brush is now in the charger and it is blinking green. Many thanks for this great guide and higher capacity batteries. Also check that the battery tags are not shorting on anything. All I get is the flashing red light when the power switch is pressed. Do use a very small soldering iron tip. I believe the two beads are a catalyst to absorb any gases (i.e. Thanks again! It involves small amounts of heat and is commonly taught at school for jewellery-making and electronics. Hi. (Has anyone ever opened the metal frame that holds the motor and cam drive assembly? Can there be a short circut under the PCB where the + battery strip is folded? I have left the multimeter on the battery and then let it run and it will continually run for about 12 or 13 minutes and voltage drops to just around 1.14 V or so and then it quits. For me it was not an easy job, but my toothbrush is running nicely again. Good point about the repairability of battery-powered devices. Please support us with writing these repair guides by buying your replacement battery through the links to our secure online shop shown. Does this indicate that this battery needs replacement? My 1st time trying to fix a gadget, helped by a friend with a solder iron. Hi Ive just got my battery, Im going to replace it this week. I have thrown away two brushes in the past, but no more! Id suggest removing the spring for a few weeks while you check that the battery runs and charges well. An excellent repair guide. Dont worry if this breaks off as we can use glue at reassembly time. The result is, the motor runs permanently and will not turn off and one of the chips gets hot very quickly. The spring seems to hold all the inner workings up against the top of the outer handle, not just the battery. I have checked all the usual things: coil connections and continuity (1.4 Ohms), motor connections (I checked it ran from a battery across its terminals when disassembled), no solder splashes. This is clipped in on both sides at the top of the brush, see the arrows below. Any thoughts? I bought a battery from you a few weeks ago, the larger capacity one, I followed the excellent guide, and in no time, the brush was back on its base, green LED blinking away. Great fun getting the soldering iron out after 30 years. We have also created a video from this guide to Braun Oral-B Professional Care Type 3754/3756 battery replacement here, which you can watch below. Im too stubborn and cheap to purchase new toothbrushes, so I replaced batteries with the larger 49mm NiMH on Oral B 3000/3756 series brushes and they work like new now! Seems the toothbrush and dead battery mayve simply sat around too long before the battery was replaced the linkage was stiff or tired who knows? Thanks a lot, did a battery replacement of 4 different machines and they are all up and running! Although the finished job looked messy it worked first time. Many thanks for your excellent guide for the battery replacement for the Braun Oral-B Pro type 3756. Thanx again! Thank you for an excellent battery replacement guide. Powered the motor with the battery via jump leads and still no joy. But what I have noticed is if I completely drain the battery so that even the pressure sensor light has no more power to flash, then I am able to put the toothbrush on the charger. (Support us by buying from. I think if you were careful, the board and coil could come out together? Also Im getting 50 mins and counting out of the bigger battery, compared to probably 28 mins (1 weeks brushing 2 min twice a day). Before it showed 1.3V after it shows 1,45V. If you use a small enough amount the base can still be removed next time you want to replace the battery. I just replaced both of ours and they now work just fine. Using the screwdriver carefully press in on the white clips on both sides (one arrowed below) which hold the black coil support in place and unclip the coil, putting it to one side. I have just fitted an upgraded battery to the older of the two, and it all seems to be working fine. Well, given you can get the thing apart first . scalpel, snap-off, retractable or Stanley type, Small flat-bladed screwdriver: 2 to 4mm wide, 10-11mm ring spanner or tool with similar sized hole, Instant glue (e.g. Thanks! Toothbrush now with big battery installed and charging! Rob. Even better with bigger battery. One question: there are what appears to be 2 small ferrite pieces in the main moulding towards the charging end of the toothbrush any idea of their purpose as they dont appear to be part of the charging magnetic circuit? We had one snag, the two copper wires on the side broke but I think they were long enough to solder back on. You now have the option to either replace the old battery with one of the same physical dimensions or modify the plastic housing to accept a longer, higher capacity 49mm battery. I have successfully changed the battery and the tooth brush now functions just like new. Hi! Another successful upgrade completed here. It will probable run for a 1 1/2 days (3 cleanings) then its dead for the next one! The + end of the battery is closest to the motor. Excellent instructions, thank you. A long stuttering sound indicates when the dentist recommended 2-minute brushing time has been reached.Both timers memorise the elapsed brushing time, even when the handle is briefly switched off during brushing. I just reassembled my toothbrush after following your instructions. (Only thing Ill watch out for when buying batteries next time is the orientation of the soldering lugs. I didnt and found it much more difficult to desolder the fine copper wires without melting the plastic battery compartment as there is a lot of solder around the joints. See the picture below for (left to right) replacement 42mm battery, original 42mm battery and replacement 49mm battery. I have a. I have kept your very good instructions in my web Favourites since I last used them to replace the battery in my Braun Oral B 3000 toothbrush two and a half years ago. Any ideas, please? If yes, you should mention it in the reassembly tutorial and if not, it would be nice adding a picture to show the original soldering position of wires. I did leave the toothbrush on the charger for 24 hours but no joy. So thats a big improvement. Thanks for the tip Rick! Faster than the original green blinking when it charges. I agree with the other comments a solder pump was much easier to use than desolder wick. The battery certainly still holds its charge well. Address1 Osprey Close, Alwoodley Leeds LS17 8XE. I have successfully replaced the battery in my Braun 3756 and given it a new lease of life. It has one tabbed AAA size NiMh cell 450mAhr, replaced with same size cell, 850mAhr. Features 3 modes: Daily Clean, Sensitive Clean, Polish Mode. Was so fortunate to find this tutorial and incredibly well-done instructions. Thanks for the tips John, glad you got it working. Regarding the motor, youll need to open up the handle and look at the gear linkages. So chuffed was I, that I bought another from you a fortnight ago, and Ive just done, unknown to her, the wifes, green LED happily blinking away. Charger is working as charges my lesser model of toothbrush. When you press the power button, you can hear and feel the motor try to start for one brief surge, but then nothing else but a flashing red light. Hardest bit is getting the case apart, there are two major clips 40mm up from the USB socket to free, a plastic guitar pick is essential. Perhaps this could be added as an option in your online store? Check the positive metal battery tag nearby too as they are very close. And, I found it handy to use a C clamp to hold the assembly steady while doing the retrofit. Hi! Hi Ash, Putting it on the charger for 10 seconds will normally reset the brush to accept the new battery. Similarly, the amount of solder applied should be minimal as components are closely spaced and short circuits must be avoided. Some times I can only get one or two, 2 minute brushing sessions. Thanks again for the wonderful site! You can use the very tip of the scissors to snip in part of the way but this relies on the scissor blades being sharp enough and tight enough! Great to hear about another successful repair . I melted some plastic during desoldering, but other than that, all went well. I had an issue with greasy residue being left under the solder preventing a solid connection. Nestor. Down with planned obsolescence! I had to solder an extra piece of tab to the positive terminal of the battery since it was cut too short. Youre right that theyre not part of the induction charging circuit. I now have an almost new toothbrush with an elongated battery life! No, lithium batteries cannot be used to replace Ni-MH batteries. But.the difference now is the battery reaches a full charge. 2 questions : If you feel carefully, about 5-6mm up from the seam, below the plug indicator, you can feel the hole the securing lug snaps into. I have also seen that the charging coil wire is melted in the plastic on one side, could this be the problem? until even the red pressure sensor light has no power to flash anymore). Holding the charger and the toothbrush gently bend the handle backwards so that the base starts to lever open. Knowing you repaired the brush yourself makes toothbrushing so much more enjoyable! With the old battery I could use it only 3 times then I had to charge it for 22 hrs, now I can use it 23 times and then I need to charge it for 20 hrs. Check the two joints where the batterys solder tags are soldered to the PCB. I have tried disconnecting the new battery and wiring in the old battery, but no joy. I like to keep things simple as I am not very experienced in soldering. Sorry for spaming. The battery in my toothbrush was appearing to charge but would die almost immediately. More recently, after not using it for a couple of weeks away, I tried to use it and found that when turned on the head would not move despite it sounding like the motor was spinning. The motor seems to slow down when I apply pressure, though. Many thanks for the instructions, this has saved yet another one from landfill! However, the only thing I got is the red light blinking. Keep up the good work, It helped me change the battery to bigger one after 6 years of using my toothbrush. Have a look through our troubleshooting tips here. So, I soldered those two points and voila!! After some head scratchinf I found the problem: the thin copper wires at the end of the coid had detached from the PCB during dissasembly. Out of interest, how many times do folks find they can replace the battery in one of these toothbrushes before faults start creeping in? Ma dopo aver seguito le istruzioni passo passo , ed aver rimontato il tutto non si accende la luce della ricarica. I tried the battery replacement in one of my Braun 3756s some time back and it didnt work, even though everything looks OK. Today I did the second of the pair and this one appears to be working fine. Everything looks okay and I dont know where I did the mistake. The green charge indicator light flashes while the handle is being charged, and when the handle is fully charged the green charge indicator light shines continuously. Over the years the motors can wear too, and can then draw higher current from the batteries which runs them down faster. is the way one solders the thin copper wires of the pressure device important? I like the ethic of trying to repair things rather than binning & buying a new product. Thanks for the guide mine is running perfectly now, apart from the pressure light which I think is just a bad connection I may get round to looking at this at some point. Thanks again for an excellent site and for the help given. Also run through the checks on our Customer Support page. But I did not change anything on the PCB, and the wires are not touching anything. But interestingly, once the toothbush is turned on, the unit would behave normally no flashing pressure sensor light when normally operating the motor. Enjoy cleaning it all before eventually poking it back in your gob. Braun Oral-B Professional Care Type 3754 & 3756 Battery Replacement, Philips Sonicare DiamondClean HX9300 series, Sonicare Toothbrush Spare Parts & Chargers. Having put it back together I have no parts left over and the charging light is flashing. This is almost exactly the same as the old battery was doing. I re solder, now red light blinking only when I press the power button. At this point you might realise that you have fallen victim to Brauns designed-in obsolescence and non-repairability if the plastic tab at the front of the base breaks off. Any top tips as it all seems to have been reconnected in the reverse of the deconnection sequence. I have successfully replaced the battery in my Professional Care 3756 with the optional longer battery and like other respondents would like to mention the the very helpful Ionic Industries detailed guide. It sounds like your battery is worn and has lost most of its capacity. It sounds like there is a short circuit somewhere, possibly at the side of the PCB where the super-fine wires terminate, the ones that run to the LED near the shaft. Happy brushing! It should be above 1.0V to run. This guide is for educational purposes only and is offered without guarantee or liability. Dont do as I did and put the battery in the wrong way round! Are you able to measure the voltage of the battery? A tip from my dad, who did the soldering work: it can help to desolder the coil first, so the black plastic wont melt when you desolder the battery. Hi David, great to hear you got the toothbrush up and running and have given it a new lease of life! You can try leaving it running continuously with no head attached after oiling both ends of the motor shaft, to see if that helps. I accidently broke the very delicate pressure warning light carrier, luckily it broke on the side that doesnt hold the very thin wires. It is nice to know what they were for. Put the bottom end into near-boiling water before you remove the base and it will come apart easily and the securing lug will not snap off. I will do as you suggest. The melted plastic near the charging coil is not a problem, but both coil wires must be soldered to the PCB and there cannot be any breaks between the solder points and the coil itself. Great instructions. Glad to hear you got your toothbrush up and running again Trevor! Got the Braun version overhauled (w/ the larger battery) thanks to the detailed how-to. This is documented in detail below along with lots of pictures. Just succeeded replacing my battery! Which New Electric Toothbrush To Buy in 2022? Can not see any short circuit. When I assemble it and place it in the charger the light flashes but every 4-5 flashes the flash is weak or like it does not have contact. And the pressure sensor light works when we apply too much pressure. Remove the handle from the charger and the base of the handle should come off. I also used de-soldering braid to remove solder. You should now be able to unclip the circuit board at the motor end of the board and slide it out. Feel like its a voltage detection circuit error. My brush just died today while using. I had to triple check my soldering in various spots because there seemed to be brown greasy stuff left from the old solder i was using and more than likely my very old corroded iron which has seen better days. Great to hear about your repair Steven, and thanks for the tip about the plastic lugs at the ends of the coil wires. Are you able to charge it for 24 hours then measure the battery voltage at the PCB terminals with a voltmeter/multimeter? There was some water inside and the board was little corroded so I assumed I broke it completely during cleaning or soldering. However, I managed to solder the ends of the wire. John. Bon Chance! 5 to 10 hours of charging under this condition would allow the motor to turn again for maybe 1 minute of usage only, before running out of juice. Dont try to solder metal tabs directly to the battery as the heat can damage the battery internally, reducing its capacity and lifespan. This is the 2nd replacement battery I have installed, but now after 12 hours charging (green charging light is flashing OK), the motor does not operate with a push of the button. Thank you! First I got a false green charging light indicator, then re-soldered the coil wires more aggressively and now its working like new. Get all the latest information on Events, Sales and Offers.Sign up for newsletter today. Philips plainly designed the innards for two AAA cells, plenty of room inside so two paralleled up would go in easy. Thanks! But the metal from the pressure warning switch is getting very hot after re-soldering it and thats very strange. Rob I followed the instructions, but something went wrong: motor is not running, leds are not lit, I have no idea if charging is working (since no leds display). Another brush saved ! Another one saved from the landfill! Along with another repair of hands, a multi-meter is your friend here! You can use a different double-A battery that has solder tags welded on if you can get them easily at your local shop. Many cycles of very hot water & lever gets the base safely free of the wand & gunk. I found the plastic of the battery holder to be harder than I expected and, although I removed most of the webs with a scalpel, I found a Dremel was good at removing the last pieces. It will not harm the LED to be connected in reverse so it is okay to experiment with this connection. As mentioned by previous DIYers, watch for excessive heat on the plastic tabs holding the coil and pressure switch, they melt rather easily, but on reassembly even with slight damage you can manage to fit and solder effectively without any shorts. Put a drop of penetrating oil down the head shaft / stud, and used silicon oil sparingly on all the cam and gear works, and voila: success. I would note the, err, current best practise for charging Lithium-Ion & NiMH batteries is *not* to run them flat, nor charge to 100%. Are the bends required to hold something in place? Thanks . Do you know what causes this? To cut the story short, now it wont charge and the charging red light is blinking very fast. Ive changed the battery charged it up motor works but the head doesnt vibrate/rotate. Is there a way of resetting the intelligent battery meter? 3. Hi Seb, have a read through our troubleshooting tips, mainly checking for short circuits, stray solder blobs, etc. My remarks for bigger battery: I must have a hundred solder balls all over my work area trying to get them to adhere to the area nicely. However using the toothbrush leads to the flashing pressure sensing light situation again so that the toothbrush will keep running (for a relatively long time such as using it for a week or so) until the battery gets drained again. What can I have done wrong? Clear instructions. The brush is now on charge after fitting the larger battery, all seems to work as it should and Im looking forward to fitting the other replacement battery to my wifes brush as she made me fit mine first. I put the original battery on, no help. Even when I pressed the button, no red light blinking no green light charging.
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