Repair of water damaged Philips sonicare toothbrush motherboard, PCB diagnostics and repair
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- čas přidán 27. 05. 2020
- With this video I‘m trying to explain the working principle of the sonicare toothbrush and some possible repairs for the PCB when it gets water damage.
Blog entry that has in depth explanation of similar sonicare toothbrush internals and it‘s working principle:
www.righto.com/2016/09/sonicar...
Further more in depth videos on this topic:
Opening and repair of the toothbrush that has no vibrations - • Philips Sonicare Diamo...
Other typical faults that this toothbrush can have - • Typical faults on Phil...
Repair for a subscriber, removing PCB from it's casing - • Philips sonicare diamo...
If you have problem removing toothbrush body from the casing this is your video :) - • How to remove Phillips...
If you would like to share some support for the channel or pour a beer as a thank you for successful repair: paypal.me/LetsFixItGarage
These are affiliate links, so if you buy directly from them small amount will be provided for channel support:
Rubber seals that I buy s.click.aliexpress.com/e/_ANI5D9
Rubber seal 1 pc s.click.aliexpress.com/e/_9IqPhH
Rubber seals with end cap s.click.aliexpress.com/e/_A9w9wR
Complete head for replacement s.click.aliexpress.com/e/_AkS0Zh
Complete head with new seal type
s.click.aliexpress.com/e/_9wGRop
If repairing of the water damaged tracks is not your thing you can replace the whole motherboard:
PHILIPS Sonicare diamondclean HX939P HX939W HX939B HX939V HX939L Motherboard s.click.aliexpress.com/e/_ASQ2zh
PHILIPS Sonicare diamondclean HX9370 HX9340 HX9350 HX9360 Motherboard s.click.aliexpress.com/e/_9fboHh
SMD fuses (2A) that I use in my videos s.click.aliexpress.com/e/_9Hsv9V
Smaller SMD fuses s.click.aliexpress.com/e/_9jKjOf
Soldering iron set
s.click.aliexpress.com/e/_AOsIIp
Soldering Iron tips
s.click.aliexpress.com/e/_9gjV6V
Screw driver and bits that I use s.click.aliexpress.com/e/_9wYDWJ
Screw driver and bits that I would buy now 😊
s.click.aliexpress.com/e/_ANI5D9
s.click.aliexpress.com/e/_AAZ275
I just wanna let you know that you made my day. After 6 hours of tweaking and troubleshooting I was really close to getting rid of that toothbrush. Nothing worked for me and I almost gave up watching your video too early. For me the issue was blown fuse. My dad probably shorted the pins of controller - before passing me the toothbrush to take a look. You are great man! I just shorted the fuse which isn't the best solution, but it is the solution that's working. Thank you once again.
Thanks it's always nice to hear that someone found it usefull! and it's the most difficult task to keep the interest and somehow convince the viewer that the info you need is there.. if you had water damage on the brush you may find my newest video usefull too: czcams.com/video/xdaX3p8pps8/video.html check it out and thanks for watching!
Thank you very much for your videos. It helped me to successfully fix the issue with the loudness on Philips Sonicare HX992R (180630). I was able to separate the coil and vibrating magnet (about 1.5 mm) enough to reduce dB back like new (after 2 years old). I also tightened the all the screws to secure the head pin and put silicon grease before assembling back. This saved me $$$!
Nice job :) share the knowledge:)
On motherboard there is a bridge in the bottom right corner, when I was removing the old battery I think I removed the bridge by mistake it took me 1 hours to realise.
I followed the + path and then - path, and found it.
Thanks Broski.
Yes. It's a safety bridge. You can desolder it before starting work on the board, or exchanging of the battery.
Great info! Can you please recommend an on/off switch for the pcb...mine needs to be changed!
Thanks. I think I used similar looking micro switch from china 1.5 height if I remember correctly. Look up "micro switch" and you will find it
Great video, thanks for posting. Do you have a video on how to take the board off the unit? I have a PBCR3 board that won't power on. Ive had mixed results with continuity on the power button, works then doesnt. Since my board is a little different I cant tell where you are testing around 15:00 from power button hole to near U1 chip. Does the test point have a label? I used multimeter from power button hole and ran probe along U1 chip and the unit powered on. I assume that means the path from power button is bad. From which points would I have to solder a jumper and to which spot? Thanks.
Sorry I don't know all the models. But idea would be the same. To take it off desolder battery terminals and induction coil terminals and it should come off.. for the point. I would do the following: first remove the battery so you wouldn't short something :) Then simply follow the line to which point on the chip it gets. Then it's up to you if you find some place where the track is corroded away - repair it, if no you can run a jumper wire from button directly to the chip..
Brilliant and I managed to replace the battery and the corroded line under the on off button but also managed to blow the small fuse by the Battery positive terminal. You mentioned checking this for a dead toothbrush but what is this fuse called and where could I buy one.
If the fuse blew it means (or I assume that it means :) ) that there was still a short on the board.. and for the fuse itself i ordered some from china.. when it will arive and if it will fit I can list the name here as these micro fuses are quite different in sizes. But what you want to look for is a P letter on it it's the value of the fuse..
@@letsfixitgarage Thanks, have you found a common area on the board where shorts usually happen. Could it be in the electromagnet coils.
@@andrewmeek7767 for now no updates, sorry. I'm afraid that the most comon place could be the board itself specially when corosion goes in to the throughout holes or under protective coating.. electromagnet would be my last suspect as it is just a wire so if you have a short it would mean a lesser vibration but not ahorting board.. or thats what I'm assuming.. but you can check it by simply desoldering the electromagnet if the board works (lights up) after that maybe i'm wrong with my assumptions..
Thank you!
Thank you for your videos.
Would you possibly be able to measure the value of a resistor for me? I have a HX8910. The resistor R1 has corroded and gone open circuit. I think this may be the feedback resistor to the microcontroller for the battery voltage. Thanks
I have only diamondclean pcb's and the R1 is next to the main button pin that I show in this video. It's value is 3.2k ohm
@@letsfixitgarage brilliant thanks. It's the pull up resistor on one of the speed selection buttons.
Hell, thank you for the great video first.
My toothbrush got water damaged too, it vibrated a little bit whenever I pressed the button, but it couldn't start. I took the pcb out and dried it out, it still had the same problem. But suddenly one time when I pressed the button, it started to work. And shortly the Q1 burnt out with smoke. I think Q1 is in the H-Bridge you mentioned. The weird thing is, after the Q1 burnt out, the toothbrush started to work without any problem. What is going on there? Is there any potential problem without the Q1? Should I replace the damaged Q1? Is it as same as Q2?
They should be the same, check the writings on the chips. Q1 burned through in open state that's why electronic works even with burned through MOSFET. You should exchange it additionaly check my other water damage videos there could be additional damage that needs to be fixed prior..
Thanks for sharing how to fix the toothbrush series! My dead brush brought me here. When I press the button, it doesn't vibrate at all. All the indicators blink all together. I didnt drop it, is it possibly water damage or something else? Appreciate ur help on this! Thx
I would suspect water damage. A lot of water damaged boards that I have have these symptoms I assume main chip senses to high consumption and shuts it down or a short somewhere has this effect..
@@letsfixitgarage I really didnt know a toothbrush could get water damage...kinda ironic. Guess I need take more care of the product...thank you!!
Don't give up, if it just started to act weird take it apart and clean everything with 99% alcohol maybe it will help. With water damage you never know sometimes it's just a cleaning that is needed and sometimes nothing helps..
@@letsfixitgarage I thought water damage would 100% short the circuit inside... Thanks for the tip!! I ll try the 99% alcohol method today!!
Love your videos. Is there any way of buying new boards? I can only finds magnets.
Thanks! Haven't seen any. I have some refurbished ones, if you need one, write me an email.. you can find it in Chanel description..
@@letsfixitgarage Thank you. I will get in contact. I bought one hoping I would be able to fix it but it seems to damaged.
hi, your videos are very interesting and helpful.
I have a different kind of Sonicare (HX680A) and I think the button has a problem and needs replacing. How do I know which button to buy and where
What are the symptoms?
@@letsfixitgarage sometimes, I can't turn it off and sometimes it turns on without touching it. I can see rust on the electromagnet, so I know there was water inside.
Ok so yes you have water inside the button. If you have good magnification you can take it apart and clean it. there is a video in my channel regarding water damage repairs and I show how to take apart and clean the diamondclean button bugger ones are even easier.. or you can desolder the old one take it to the electronic shop and hope they will have it.. or search in aliexpress they have everything :D
@@letsfixitgarage thanks. I will check the video! The button is pretty small and I do not have the magnifier (yet). So I was hoping to replace it. Thanks for from Austria!
Without magnificqtion it's quite hard especially first time.. then exhange is better option but again desoldering could be tricky with soldering iron.. hot air is easier.. Gruß von Litauen :)
First off, I am very thankful for your videos. I repaired my diamond clean with a new PCB board since it had water damage. Everything seems to work great after replacing, but now it will not charge. At least, the light will not come on like normal when placing it to charge. I tested continuity on the top and bottom of the charging coil as well as the test points next to the pins and checked out fine. Not sure why I can't get a charge. Have you come across this when replacing the pcb board or anything?
difficult to say.... if you have old board you can double check the KLB chip as it is mostly responsible for charging. if coil is not damaged by removing the toothbrush from case only charger could be faulty... although they are quite reliable..
Charger is good since I have two of these toothbrushes and the other charges fine. I most likely have an old board as it is pretty old. Where is the KLB chip or what does it look like? @@letsfixitgarage
KLB chip is usually found on diamondclean and other boards on the bottom part of the motherboard. There are two chips one of them 5 legs if not mistaken will have KLB on it. If you have 2 brushes you can check both boards chips in resistance or diode mode and see if something comes out as faulty. Do take out battery before testing as not to short something..
Thanks again for your guidance. The KLB chip had a little solder on two of the legs and combined the contacts when I was placing the battery back in. Removed this and boom working. You are amazing.
Hi and thank you for teaching this to us. I've replaced the PCB on my HX9360. After connecting the jumper on the new PCB it worked again. Now its battery is depleted and it's not charging anymore. It was reacting to the charger through the LED's but not charging as it's dead now. The battery does still have voltage so I suppose it is fine? Any idea on what to look for? It simply won't charge up anymore :( Thank you!
Where did you got the new PCB? Maybe it is defect and you could contact the seller for a replacement.. or maybe charging coil got damaged..
@@letsfixitgarage hi thank you! So i got it from aliexpress. With a bit of tinkering i managed. I recharged the battery, bypassing the coil. Also I don't think the coil is the problem. After charging it it would constantly tell me the battery was depleted, even though it was fully charged. I removed and then reconnected the board jumper next to the battery pin and et voila it turns on again. Problem now is it seems the LEDs don't turn off anymore. I've attached a video. Have you seen this behaviour before or any idea? czcams.com/users/shorts0SGzLtUJfck?feature=share THANK YOU 🙏
@@letsfixitgarage Hey. Also just tried to charge it again. So it does actually react and charge on the induction charger. It basically works, it just does not turn off. I made a video of it's behaviour and uploaded it here: czcams.com/users/shortsTFbCNGPqAtE?feature=share - do you have any idea what that could be? Thank you! 🙏
Still no luck on fixing this one, just don't understand why it doesn't properly turn off after use or charging :(
It's really difficult to diagnose just on description.. but still if you bought a new board from AliExpress you should contact the seller as it seems that the board is defect.. there is no relationship between PCB functionality and battery or Electromagnet..
hey, i have a model 9360 with a poor repair attempt by someone else. There is a small 6pin SMD package missing, the one next to the Battery GND.
It seems like it was accidentally removed with a much too big iron when the battery was replaced.
Can you tell me what it's marking is, or whatever you know about it?
On a video it seems to read KL8 or KLB
sorry for late response for some reason didn't got notification about this message. you are right writing is KLB but I havent seen this part as spare part usually i take it off some donor board if needed.. If not mistaken it should be responsible for charging
2 years, the toothbrush does not turn on. PCB path corrosion. I connected the paths and it works. Thanks.
Nice job! Yes these through holes are quite sensitive but all the other electronic components hold up quite well..
can you replace the seal on the top?
When you take it apart it's very easy to replace the seal. And sadly no way to exchange it without taking it apart..
@@letsfixitgarage thx, I managed to opened HX9370 by following your steps. I will replace the battery and the seal next. nice videos, keep it up!
Hello. I have had a totally fine working toothbrush, but it was making a strange noise. So, I have dissasembly it, removed PCB, tighten the screw on the top and..... by mistake, I have shortened two of those six diagnostics pin. I've did shorten the middle two pins ( two out of six - in the middle ). Before, when I connect multimeter to one pin and other, there was about 3,6V, now, it is showing 0,5V and the toothbrush dont want to switch on and dont want to charge. When I connect multimeter to those two pins and after I press switch button, the voltage goes down from 0,5V to 0V and then after one second it back to 0,5V. Could you, please, tell me what to do now? You have mentioned about temporarily fuse, but how long I need to wait for this fuse to let the current flow?
Resetable fuse is next to the positive battery terminal you can check if it's ok with continuity mode.. it usually resets almost instantly and it's not eternal it does burn through.. but if it's ok don't really have any advice.. these pins are used to program the chip.. so it could be that logic chip fried.. never had this situation so can't give you any advice :/
@@letsfixitgarage If you were me, what would you check first? Apart from this fuse.
Difficult yo say.. if the fuse is ok, battery is charged and it was a working toothbrush without water inside there is not much to check.. chip will be bricked.
Hi.I bought a new motherboard from Aliexpres,do you have a experiences they cuold by faulty?Becouse does not work.By pushing botton lights a short time.But no funktion.Thanks
Sorry haven't tried ones from AliExpress.. and there are a lot of sellers... I usually use original donor boards that I get from defect brushes from eBay.. try to contact the seller they are quite fast in replying and avoiding bad reviews..
BTW what battery do you recommend?
Is the original really dead? Maybe it's only deeply discharged. Check with multimeter what voltage it shows..
@@letsfixitgarage it shows 0 voltage, it wouldn't charge. i dont have anything to charge it with higher voltage though
@@mike82y 0v is of course to much of a discharge.. there are methods that could work but the capacity will not be the same and it's not very safe.. so yes new battery is a must. I would sugest any same size li ion battery or a genuine replacement but you are talking about replacing the seal to, so I asume there was water inside.. are you sure there is no corosion on the board or back of the board? Not that you will buy a new battery and it will not help..
Can you tell me if I changed de motherboard and now when when input in on the charger the leds only blink.. is the battery dead then?
If battery is from 3.6 to 4.2 volts it's fine. Did you installed a new Motherboard? Additionally what about the charging coil is it ok, not damaged?
Yes I put a new motherboard in.
How can I check if it is the charging coils is damaged
First suggestion would be simple visual inspection if coil not damaged it should be ok.
Hello, maybe you can help me. I have Sonicare same as on this video. All works perfect, but it have some strange issue. After I finish using it and leave it for some time ~1-2 minutes and it is automatically turns on Light, and it is never goes off. So It always needs to be placed in charging glass. I thought that it could be something wrong with button, when i touch some contacts I was able to reproduce issue. So I replaced a button from old one and issue still exists :(
sorry, don't have a concrete solution.. it could be that some elements on the board are getting bad.. its quite difficult to diagnose this partial defect.. I would start looking for a donor board and when it will get completely defect then try to diagnose and exchange the components..
Impressive that you can fix it, but I opted to buy a $30 Aquasonic in lieu of paying for the parts and time to fix my HX9120. I did manage to fix my partner's by separating the magnet/coil. One win for me, one for the landfill.
Yes some fixes are rather for expert level. On the other side 1:1 is much better than 2:0 ;) good job!
Fuse has gone on my board. Can you tell me what to order?
I don't remember the size correctly. I think 0402 is the one needed.. but better would be to measure it of course. I have some Chinese 2a fuses that I set in place of the dead ones, they work fine. Is this not to much I don't know for 100%
@@letsfixitgarage Thank you for the prompt reply and info.
Thanks so much for all of your videos, My Sonicare was revived 2 times through your videos, and water damage was complicated, so I will post another comment later explaining what I have gone through.
Right now, my fuse F1 is labelled as P blown out for some reason That I don't understand, I bypassed the fuse, and it worked for a few seconds. Then all lights are off and can't turn on, yet the toothbrush still works, and I can switch the modes, but no light, I used your clever diagnostic of supermarket thermal paper, and I found that the IC labelled as IU2FA is burning hot!
Any chance of knowing what is going on? I disabled the battery solder points as this is dangerous.
I ordered a new board from Ali Express for a full swap, yet I still believe that if I change the IU2FA, it may work again; any explanations?
And most importantly, How can I get this IU2FA? Digging on the internet, I found this close but not enough.
MP9361DJ
www.eevblog.com/forum/beginners/iu2dh-smd-code/
Any help will be appreciated.
Nice job with other repairs. To disconnect the battery power to the brush you can remove solder blob next to the negative battery contact. This is a bridge that easy disconnects power to the brush. Regarding the chip I would say the fastest way is to get a simmilar defect brush from eBay and exchange the chip. Sorry don't have any info about it