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Repair Guide for Sonicare DiamondClean Toothbrush Published – Philips HX9340

In our latest electric toothbrush battery replacement guide we have dismantled the top-of-the-range Philips Sonicare DiamondClean model.

The Sonicare DiamondClean toothbrush sold for up to £250 when first introduced, so it’s well worth repairing! The guide covers all DiamondClean HX9300 series toothbrushes, including the HX9330, HX9340, HX9350, HX9360 and HX9370 models (white, black, pink, purple, rose gold, etc.)

It was a tricky toothbrush to open up but here at Ionic Industries HQ we found a damage-free way of doing it.

Read our full DiamondClean toothbrush repair guide here or leave your comments, questions and tips below.

Philips-Sonicare-DiamondClean-HX9340-Toothbrush

165 thoughts on “Repair Guide for Sonicare DiamondClean Toothbrush Published – Philips HX9340

  1. My Phillips Sonic care HX9340 Diamond care tooth brush shows fully charged and the lights are bright, but the vibration is weak. Would this be a bad battery?

    1. Hi James, yes the battery could be failing or it could be that the screw is loose that clamps the metal shaft to the solenoid. You can use our guide to open the handle then check that the screw is tight.

      1. I found that the electromagnets are held to the frame with two screws. These screws are allowed to slide up and down in the frame. As the toothbrush vibrates, the screws work their way up because the electromagnet attracts to the magnet on the shaft. Once these magnets come into contact, the shaft can no longer vibrate back and forth. It is a design flaw that the electromagnet can slide up the frame. You need to loosen the 2 screws on the electromagnet (one is behind the PCB) and push the electromagnet back down so there is a slight gap between the top of the electromagnet and the bottom of the shaft magnet.

        1. Thanks for the tip Brent!

        2. I wasn’t able to get under the pcb easy but I did loosen the screw not covered. Then I used a little flat head and pried in between the magnet and the electromagnet and gently twisted it to give a gap, while holding apart i used my other hand to tighten the screw again. Thanks Brent! you rock!

        3. Thank you for this extremely helpful hint! Indeed I had this problem with similar a Sonicar HX6710. Actually I had both problems: 1) screw that holds the shaft came loose 2) screw that holds the solenoids came loose. The result of (1) is that the handle makes a lot of noise but hardly any movement of the shaft. Result of (2) is that there is no movement and only a very faint vibration sound (possibly discernible only when the motor unit is taken out of the handle tube. – Once you understand the principle, it is easy to fix. – What a stupid design. – Philips offers replacement for handles with such damage, but only in the guarrantee period. – They should better publish repair instructions!

  2. James, More than likely your battery is okay. Sonicare uses what appears to be a die cast metal part that the brush mount pin is pressed into. This die cast part is connected to a formed sheet metal cage by a Phillips head screw. That metal part sometimes breaks at the point where the screw goes through it into its hex nut. When it cracks or breaks there is no longer a firm connection to the vibratory cage and you no longer have a strong vibration at the brush head. Additionally, you may find that your Sonicare is much louder than it was!

    1. I had this exact same problem too. My sonicare fell over and then the vibrating was no longer transferring to the tooth brush head. I took the diamond clean apart and found the die cast piece was snapped where the screw goes into it. I ordered a replacement part on eBay for $12. I’m pretty certain no glue would work for a repair like this since it’s such a pivotal part of the brush. Repair worked like a charm.

      1. James,
        I have exactly the same problem. Where did you find the replacement part? I am having great troubles trying to find th edie cast part.
        Thanks,
        Chris

        1. I cannot vouch for the sellers, but on Ebay there are whole Sonicare motor/shaft assemblies available here or here, including the die cast part.

  3. I opened mine and found that the die cast metal part has broken as MadTinkerer mentioned.
    Anyone know how to fix that? Glue probably won’t be strong enough.
    Possible to buy a replacement for that part?

    1. Not sure if it would work but 2-part epoxy resin might repair the broken die-cast part.

    2. I recommend: find a broken one at e-bay or so, and use the parts from it.

  4. The toothbrush comes on but while cleaning it loses power when any force is applied to your teeth.

    1. It sounds like you might need to open up the toothbrush and tighten the screw that secures the connection between the solenoid and shaft.

    2. It may be that the magnets are touching. Brent helped me out above. Basically there should be a gap between them and if not, loosen the Phillips head screw on the opposite side of the pcb and then if there isn’t a gap already, create a gap where the magnet meets the other magnet (just above the battery)

      1. This is exactly what was wrong with my toothbrush. Just needed to adjust the position of the magnet assembly. It’s easiest if two people do this – one to pull back on the magnet assembly and another to tighten the screw since it’s somewhat “spring loaded”. Toothbrush works like new again!

        1. can you send me a video on how to do this?

  5. Hi,
    my toothbrush stopped working a few days ago. one or two days earlier the white lights stopped working, but the toothbrush is dead now completely.
    I opened it an d checked the battery. The green light is flashing when I put the toothbrush in the case, but it reached a maximum of 2.2 V. Do you think it will help to replace the battery or does it look like another problem?

    Thanks
    Julian

    1. Hi Julian,
      If the battery is only reading 2.2V then it is probably a faulty battery. As long as there is no water damage to the PCB, fitting a new battery should repair your Sonicare.

  6. Hi,
    my Sonicare HX6930 seems to send a signal to me: when I want to charge it, there is a long vibration tone followed by two short ones. It sounds like: beeeeeep, beepbeep.
    I think the battery is ok, but I cannot charge it anymore because of that signal.
    As I opened the toothbrush, it seemed to be wet inside …
    Is there a solution for this problem? Can I get the electronic somewhere?
    Thanks
    Paul

    1. Hi Paul, If it is wet inside the toothbrush handle then you will need to dry it out in a warm room or cupboard. Then it should charge correctly. Always store your Sonicare with the head removed so that water cannot seep down the shaft.

  7. Hi,
    “then it should charge correctly”: it should, but it does not.
    I always stored it with the head removed, I even dried it carefully everytime after I used it, but …
    Again my question: do you know what this vibration signal means? And: is there a chance to get the electronic part of the toothbrush somewhere?
    Thanks a lot
    Paul

    1. Hi Paul, unfortunately I do not know what the long-short-short beeping means. The only mention of 3 beeps in the manual is to indicate low charge (under 25%). See the Sonicare Flexcare HX6930 manual on the Philips website here. I do not know of any place to buy a new PCB. If the PCB is faulty you will probably have to buy a new handle. These are sold without the charger on ebay.

  8. The metal prong that sticks out of the handle was pulled out with a toothbrush head while removing for travel. Anyone know how to repair? I tried putting it back into the handle and the brushhead vibrates but falls off when trying to brush teeth. Phillips was of no help; their customer service sucks.

    1. It could be that retaining screw has come out inside the handle. Use our guide to open up the handle and see if the screw has come out. You might be able to reassemble it. Also, you can sometimes buy replacement solenoid/shaft assemblies on ebay, see item 261509165700 – no affiliation or endorsement.

  9. Where can I buy (from UK) a replacement battery for my DiamondClean toothbrush. I fancy trying out replacing mine using the video shown here, thanks

    1. We’re based in the UK so you can buy a Sonicare toothbrush replacement battery from our online shop. We offer worldwide shipping too.

  10. Great thanks

    1. You will probably need one with a finer tip. The Antex XS25 comes with a smaller, precision tip (diagonally cut) but costs a bit more than the Draper one. It’s available in a kit (SK9). You will also need a desoldering pump (solder sucker).

  11. Also, how many watts do you need for soldering iron?

    1. Probably 18 to 25 watts for micro electronic (PCB) use. I’ve never used a gas iron so I can’t make any recommendations. If you have friends, family or colleagues with a soldering iron you could borrow one, otherwise your best bet is to visit your local Maplin shop and see what they advise. You might have a local makerspace / hackspace with all the equipment too. Another thought – with the cheap Draper iron you might be able to get a smaller tip to attach to it to make it more suitable for micro electronics.

  12. My Diamondclean turns on automatically by itself. Any idea?

    1. It sounds like water has got inside it via the seal at the top. You could open the casing, partially slide out the innards and dry it all out in a warm room or cupboard for a few days. Always store your brush between uses with the head removed.

  13. I replaced the battery but it won’t charge. Any suggestions?

    1. Hi Elizabeth, does the brush run? Check your soldering of the 2 battery pins and JP1. Check that there are no stray blobs or whiskers of solder on the PCB causing a short. Also check for water damage to the PCB which might have caused the original battery and circuitry to stop working.

      1. I replaced the battery, and it worked… until that new battery also died (after one use). I tried both chargers and neither charge the new battery. Won’t turn on at all now. Is there hope for a solution? What do you recommend?

        1. Hi, check your solder connections including JP1. Also check the fine wires from the charging coil are intact. Then see if the charging light flashes when the brush is on the charger and see if it charges correctly. Otherwise, contact the seller of the battery for a replacement.

  14. Would it be possible to send to you guys the diamondclean handle for replacing the battery since I reckon most people would find it difficult to change the battery themselves (and the need to buy the soldering equipment which will be hardly in use). You can charge the labour + battery + shipping cost?

    1. Hi Tony, Sorry we don’t offer this service but you can try your local television repair shop, mobile phone repair shop or appliance repair shop.

  15. It did run after I changed the battery. I guess the battery itself had a full charge. I will check my solders.

  16. My turn on button will not turn on by pressing. I need to push it with a hard object.

    1. I’ve heard of this happening with the DiamondClean where dried toothpaste has got under the button. Apparently the solution is to soak the handle in water then massage the button, but make sure the pinhole in the end cap is covered with something sticky and don’t immerse the shaft seal. It’s probably safest to dismantle the handle and just soak the outer casing to guarantee no water gets to the electronics.

  17. My diamond clean will charge but once it is done it will only act like it it’s is locked. No mode changes and the brush will not vibrate. When it is on the stand it will toggle between locked and unlocked. Possible the battery is shot? The lights all work and the lights will flash when the power button is pushed.

    1. It sounds like it might have water inside it. Try opening up the handle and letting it all dry out.

  18. My sonicare doesnt charge after i put it in the case.The light green battery indicator flashes once i put it in the charger but it goes out after that and the toothbrush is dead.

    1. Hi Birrt, first check that there is no water inside the handle. If it is dry and the battery no longer charges then you might need a new battery.

  19. Hi my tooth brush worked but was very weak when brush my teeth, it make a lot of noise but didn’t do very much. I have replaced my battery with a new one from yourself but I am still getting the same problem. I read an earlier post about the screw being loose but I found mine was tight. Any other ideas at all?

    1. It could be that the die-cast metal piece that connects the output shaft to the solenoid has broken.

  20. i have removed it again and also removed the die cast part and that seems fine. It does look like a smaller screw if I go back down the shaft towards the solenoid/motor and maybe this screw could be loose? The thing is I can’t seem to find a way to get to that screw head????

    1. I see the screw you mean! It looks totally inaccessible, just in front of the solenoid windings, near the top and covered by the metal shroud. If you’re sure that it is loose then you could possibly drill a hole above it, through the metal shroud to get a screwdriver head in there.
      There is another screw at the back of the solenoid, visible in the photo here. Check that this screw is present and tight.
      As a last resort you might be able to buy a replacement solenoid, for example search eBay for item 261509165700 – no affiliation or recommendation of the seller.

  21. Hi. I replaced the battery (with a new one purchased from yourselves) after following the instructions on your guide. However when I insert the toothbrush in the charger all the LEDs flicker weakly and simultaneously.

    I checked the solder joints and the battery orientation. Any idea what this should be and how I should address it?

    Many thanks !

    1. That’s a strange one! Does the toothbrush switch on? The batteries are supplied with enough charge to run the toothbrush. Check that the charging coil in the brush is still connected to the PCB and that JP1 is fully resoldered.

  22. Thank you for your reply.

    – No the toothbrush does not switch on and I can’t detect any vibration/movement.
    – I will follow your recommendations above and revert.

    Can I perhaps send you a picture of the PCB and soldering? If so should I do so via email? You can contact me via email on the address supplied in this post.

    Thanks 🙂

      1. Hi, I have the same problem. Do you found some solutions?
        When I want to charge only white diods are lightly flashed. The green one is not turn on. Thanks Michal

        1. Check both sides of the PCB for water damage. This will appear as corrosion or staining and can break continuity of the PCB tracks.

          1. Yes. You are right. On the bottom is water. Thanks for the tip!

  23. Hi
    my toothbrush doesn’t want to turn even after i’ve fully charged it, i press the button and nothing. i opened it up but i have no idea what i’m looking for. i tried pressing the button to what seems like the power button but still nothing..

    1. Hi Annie, check the PCB for water damage on both sides, especially around the switch and its connecting tracks.

  24. My toothbrush won’t turn ON. Sometimes the lights flicker but still doesn’t turn ON. So, I took it apart to clean the button and check on the battery. The battery measures 3.9 V. I pressed the button on the board but it still doesn’t turn ON. Both screws are tight. I removed the battery just to check it out of circuit and I still get 3.9 V. The pins on the right side of the switch are connected, measured 0.3 ohms. The pins on the left side are also tied together. I measured across the switch when pressing the button but only get 5 ohms with the battery removed and was getting 10 ohms before removing the battery. Not the short I was expecting but I didn’t see what else was tied to the switch yet. Have you seen the before? Any suggestions?

    1. Hi Kim, it sounds like there could be water damage to the top or bottom of the PCB causing a broken track.

  25. Please let me know what to do with sonic- in less than a year it’s not charging but light is flushing when it’s on a base

    1. If it’s less than a year old it’ll be under guarantee so return it to where you bought it!

  26. Hello,

    My Diamondclean was working perfectly fine, but when I tried to use it today, it wouldn’t turn on. It would click for a less then a second every time I press the power button but won’t actually turn on.

    When i put it back on the base, i can see that the battery icon is green and all the other icons light up.

    Any idea on what could be the issue? thank you

    1. Hi Mike, it could be water inside the housing that is causing the fault. Open up the handle and dry out the innards in a warm room or cupboard. Also check the battery for rust.

  27. Hi my sonicare hx6730 has charged but doesn’t vibrate except for the interval buzz. I have changed the battery and it is dry. Any ideas?

    1. Check for water damage to the PCB. There might be white clouding on either side which could indicate damaged PCB tracks.

  28. Hello, my Sonicare HX6750 vibrates normally when there is no pressure applied, but when I apply pressure while brushing my teeth it loses almost all vibration. I have noticed play in the brush head in all directions. I opened up the toothbrush and tried to tighten the screw that secures the connection between the solenoid and shaft, but it was fairly tight already. I turned it a little tighter still and reassembled the toothbrush only to find that it made my problem slightly worse. What else should I try? Thanks

    1. Hi Tyler, it sounds like the cast metal piece that connects the solenoid to the external shaft might be broken.

    2. This is probably not helpful for you anymore, but to anyone else that has this issue in the future this might help. I had this issue with my HX6530 and I read somewhere else that it might be the safety/pressure feature kicking in too early. By design, if it senses too much pressure, the vibration will shift to the handle. I played around with the position of the coils/electromagnet of the toothbrush and noticed that when it comes into contact with the metal plate above it, the vibration is very weak. Leave a small gap/move it back to its initial position based on the initial markings left by the screw, it would have a strong vibration and the pressure sensor would work as normal. Its worth noting that the magnet is pretty strong, so you may need to place something thin inbetween (I used a thin zip-tie) to maintain the gap as you screw it into position.

  29. Hi. I dropped my diamond clean and since then it vibrates, sort of, but when you put it to your teeth you can feel that it’s a bit off and if it’s in total contact to the teeth it still makes noise but the head stops vibrating. Any suggestions?

    1. Hi Heather, it sounds like you might have the same problem as Tyler!

  30. First of all, thanks for this wonderful tutorial! My stopped turning on suddenly one day. I tried another charger (GF has same brush) and still did not charge. I just opened it and noticed that the battery is just showing 1.2-1.3V. I am guessing it is a bad battery? I have had this brush for 1.5 years now used daily.

    Additional Questions:

    1. How do I know if there is any water damage to the PCB? Not sure what water damage looks like.

    2. My rubber seal has black mold on it. How exactly do I open the top part to replace it? I am talking about this part: http://www.imagebam.com/image/76a78e504670889

    Thank You!

    1. Hi Jaleel, glad you like the tutorial! The voltage reading is too low for a healthy li-ion DiamondClean battery so that will need replacing. In answer to your other questions:

      1. Water damage looks like staining on the PCB, often white in colour. Unfortunately you can’t see the bottom side of the PCB without removing it 🙁 However, your issue sounds like it’s the battery.
      2. When you slide the innards out of the brush casing you get access to the seal at the top. This can then be removed for cleaning or replacement. To stop future build up of mould, always remove the head from the brush after use and rinse it all with clean water.
      1. Hello,

        Just wanted to make a quick update. When I opened up the tooth brush I did notice some water on the PCB board. and little mold on the end cap which sits on the charger. I let it dry 36 hours, and also cleaned up the mold the best I could then placed brush on charger for 24 hours. Once I put it on the charger, the green light finally comes back on but flashes green. Not sure if flashing green means it’s charging or fully charged because after 24 hours of charging, tooth brush will still not turn on. Perhaps I need to put it back in the casing for it to turn on? The battery now measures 4.08V.

        What are your thoughts, do you still think it is a defective battery with this updated information or something worse?

        Thank You! I really appreciate you responding to my post and helping out. You are a very good person!

        1. If the battery is still reading over 3.7V after 12 hours off the charger then it should run the toothbrush. If the toothbrush won’t turn on then sadly the PCB is probably damaged, with a broken track somewhere 🙁 If you are good at soldering and can find the broken track you might be able to bypass the break with a piece of fine wire.

  31. Hi! My Diamondcare continue to flash green after finishing teeth cleaning for about 5-6 hours every time. Is it okay? I bought it 1 month ago

    1. Hi Alex, I’m not sure – perhaps someone else can advise?

  32. I am having trouble getting the black tabs out of the way to remove the innards. It looks like both sides have to be held out of the way simultaneously while pushing down on the shaft towards the table – for the assembly to work. Btw your video on youtube would be more useful with some sound. The instructions on YT and here say to use a screwdriver to move the tabs out of the way, but it could be clearer if it described whether they have to be held out of the way while pushing, which is my hunch. Another challenge is that when I pry down on the plastic lever, it looks like a larger plastic or metal piece is pulled inward with it, but it may not be fully clearing the stop. A large closeup of the piece would be useful with the lovely green lines

    1. Hi Jim, yes the black tabs are ‘stepped’ so the piece you actually catch and move away from the handle casing with the screwdriver has another lump behind it. In my experience there is already slight tension on the innards within the casing, so that when you release the black tab on one side there is slight movement on the innards so that catch stays released while you release the one on the other side. If the first catch is not staying released that’s when you need that third hand to either apply slight pressure by pushing the shaft into the casing or hold the first catch released while you work on the second one with another screwdriver!

  33. HI Admin,
    I’m having problem with my Sonicare 2 (HX 6xxx series), it is “losing power” when pressed against the teeth, just buzzing.
    So i decided to open it and after much trying, I managed to pry it open and I found out that the locking system is totally different than the 2 guides here. The conductor charger is attached to the cap and i might have disconnected the wire (now i have 2 loose wires that i don’t know where did they connect to). And I still didn’t manage to solve the losing power part, as there is no screw to tighten!
    Can you pls help me?

    1. Hi Sikaa, what is the full HX number of your brush?

      1. I have this same problem its an HX 6930

        1. Noah, check the screw in your Flexcare that holds the metal brush-head shaft to the cast metal block connected to the solenoid assembly.

  34. HI,

    I already opened the toothbrush and removed the top cap. There is mold and a hold on the rubber seal. I want to change it. Does anyone know where to buy one of this seal?

    1. molded and has a hole

  35. Hi, when I place my toothbrush on the glass appearntly charge, the light green but it doesnt works. If you can guide about this issue I appreciate.

    Sincerely,
    Camilo.

    1. Try removing the casing of the toothbrush and switch it on by pressing the switch on the PCB. There is a common problem with the plastic button on the DiamondClean casing getting jammed.

  36. Hi I would like to know if water can get inside of the toothbrush from the on button? Thanks!

    1. Water mainly gets in through the seal at the top of the toothbrush. If the brush is stored upright with the head attached then water can start to seep past the seal and run down the insides of your Sonicare toothbrush.

  37. All the lights and battery display are working as usual but when I press the power button nothing happens, not even a hum. This did start after I replaced the head. Any ideas?

  38. Hi my Diamondclean seems to be working ok at the moment, but it has a fault whereby all the lights are lit up all the time, which I assume is going to have a big impact on the battery life. The only time they turn off is when you put it in the charger, they turn off for a second. Otherwise, they are all lit all the time.
    Any ideas?

    1. It could be water inside the handle. Open up the handle and let it dry out for 48 hours in a warm room.

  39. My Philips Sonicare HX9332/04 DiamondClean has suddenly become very loud in vibration after i replaced the head which I bought in Boots.

    1. Is it still loud with the old head fitted?

      1. Unfortunately I threw away the old head as soon as I replaced it. It was normal till about 3 days into using the new head.

        1. It could be the internal screw connecting the shaft to the solenoid that has come loose. If the toothbrush is under a year old, take it back to the shop (there may even be 2 years guarantee on it.)

  40. Hi all,

    I (stupidly) attempted to charge my sonicare diamondclean using an Oral-B contact less charger for I forgot to bring my charger while visiting a friend. I thought the brush was charged fine after 30 min. However it was showing a strange behavior. The lights would not go off after I stop it and the battery indicator would keep flashing green for about a minute then all lights go off. Any chance I can reset it to normal ?

    1. Maybe using it until the battery is flat then giving it a full charge on its Philips charger will reset it.

  41. Hello.

    my diamondclean started to turn itself on perioically on its own. now it turns on for 2 or 3 seconds but doesnt stay on. i opened it up using your tutorial and found a bit of damp, which i have now dried. however the toothbrush still wont turn on. do you think it could be the battery needs replacing?

    1. Will the toothbrush switch on with the outer casing removed? Sometimes the plastic button on the DiamondClean casing can get gummed up with toothpaste and won’t push in.

  42. My HX9340 Diamond (black) toothbrush is fully charged. When removed from charger all lights are solid and bright but toothbrush won’t work. I can feel some slight vibes. I disassembled it and found no gap between the driver and red magnets so I did adjust it. I see the gap but toothbrush won’t start at all. Is it a battery as weel? Please advise.

    1. It sounds like it might be water damage or a mechanical failure rather than the battery 🙁

  43. My sonicare is turning on by itself and flashing red while doing so. It does it through the night without even touching anything. Do you think it’s the battery?

    1. It’s probably got moisture inside the casing. Remove the inner workings from the outer casing of the handle and let them dry out for 48 hours. To stop water getting inside the toothbrush, always store your toothbruh on its side with the head removed.

  44. Where can i found a battery?
    it appeat out of stock everywhere!

  45. Hi – is the broken shaft issue fixable? My Diamondclean brush has gone very loud but vibrates only weakly. It seems this is probably the broken/fatigued metal shaft problem I have seen mentioned a few times. What I haven’t seen is any fix. Is there a source for a replacement part? Brush is out of warranty but binning a £140 brush after 3 years seems crazy.

    1. It might just be a loose screw. But if the metal has snapped then perhaps some sort of 2-part epoxy glue might fix it. Let us know how you get on!

  46. Hi,

    My diamondclean recently became much less powerful. I read some blogs and discovered it was likely due to the fact that the over time the internal magnets sometimes slip closer to one another. I opened the handle, moved the magnets slightly further apart, and hey presto, the vibrations became more powerful again. However, when I took the handle apart, some of the metal plating of the base cap came off, and not thinking much of it, I scraped off the rest so it didn’t look patchy. Now, when I have put the handle back in the charger, it won’t charge. Is the metal plating on the base cap essential for the handle to charge, or is it just a red-herring and I may have managed to dislodge a connection essential for charging when moving the magnets? Thanks for your help

    1. Hi Dan, interesting question! The chrome plating on the base cap is just for cosmetic purposes and won’t affect the charging. In fact the brush will charge with no base cap in place. There should be an iron core in the centre of the coil so check that is present. Also check that the wires from the charging coil to the PCB are intact.

  47. Hi! My diamond clean has completely stopped charging either in the travel case or the glass. Usually the green light and blue lights come on. Any idea what happened, water damage, or the power button problem maybe? Thanks

    1. Hi Alan! It could be water damage so remove the innards of the toothbrush and let it dry out somewehere warm for a day or two. Then try charging again.

  48. Hello, thanks for a great guide! Have removed the cap but am not able to find or loosen the black plastic clips. Do you just use one screwdriver for this? And is it just to put it in there somewhere?

    Thanks!
    Stig

    1. You need to move the black plastic clips away from the wall of the handle. Normally you can do one at a time (because of internal tension) but you might need to do them both at once, using 2 screwdrivers.

  49. Hi

    I have changed my sonicare HX 9340 battery today.
    All appears ok but when I place it in the glass tumbler to charge the charge light does not light?

    All the other LED’s go out so I’m assuming this is to do with the circuitry not recognising the new brand of battery.
    Any thoughts?

    Brian

    1. Hi Brian, does the brush run when you switch it on? There should always be some charge in new Li-ion batteries.

      1. Hi yes all ok and it’s been on charge overnight, other than the charge light not coming on everything is fine.

        It appears to have charged as I continued to try and run down the battery yesterday so I’m baffled.

        Brian

        1. Perhaps the LED has been shorted out on the PCB by a stray blob or whisker of solder.

  50. My sonicare diamond clean got water underneath the rubber boot when it tore. I put it in rice for a week after taking the cover off. All I get are a few short (not the same length) pulses from the motor. It won’t go into the full clean cycle of 30 seconds per Buzz.

    Ideas?

    1. There might be water damage to the PCB tracks or components. Have you recharged it since drying it out?

      1. Yes. Has been in charger since a week ago. I get a 1 second Buzz then it stops. Then 0.5 seconds. Then 0.25 seconds. Then nothing. I have to push the button the start it between each Buzz.

        1. It sounds like water damage to either side of the PCB, or the battery is dead.

  51. My toothbrush is approximately 2 years old. Just quit charging. No life in it whatsoever. Any suggestions please?
    Thank you
    Cathy

    1. It might have water inside. Open up the casing and let it dry out for 48 hours.

  52. Philips diamondclean toothbrush started playing up, turning itself on and hard to turn on in use. Foolishly followed Youtube advise and soaked in water only half way up to on button, not the bottom. Removed from casing, dried it over days and sprayed it with electronic circuit cleaner. Will not turn on and will not charge although all the lights flicker apart from the charging indicator one. Battery still connected and showing 3.58v. Do not know where to go from here, can i check anything else? Would a new battery solve it or do you think there is a break somewhere?
    Many thanks and kind regards

    1. The battery voltage should be enough to get it to run outside the casing, so it sounds like there could be water damage to either side of the PCB.

      1. How can one repair the water damage?

        1. Water damage will either destroy components (not repairable) or damage PCB tracks. PCB tracks can sometimes be bypassed with wires where the tracks have broken.

  53. Hi.
    First – sorry for my English. Is not my first long, and I’m still on the learning path. 🙂
    Second – mi DimondClean starts to behave in the strange way:
    After I put it on the charger, the green light is blinking very slowly.
    Then, after I take the brush out of it and press the on/off button, all lights light up, no reaction from the mechanical part, than all lights goes down and that’s it.
    After this I may push on/off button as much as possible, without any reaction.
    I did check the battery – looks to be OK – 3.5V.
    No visual damages coming from water.
    Any ideas what could it be?

    Thnx
    kr
    Rafal

    1. Is that measured voltage with powered on?Battery will show higher voltage with unit off.If battery voltage stays up with unit turned on I would dry it out and see if that helps.Also make sure there is a gap,maybe 1mm,between magnet and driver.

      1. Hi Jon
        Thanks for the answer.
        The measurement was done on pure battery. I just took it out from the device. I will check again with power on.
        Regarding water inside i I don’t think it is the case, as the brush is disassembled since few days, and I’ve also made some cleaning.
        Did not help.
        Will be back once the voltage is measured.

        kr
        Rafal

        1. AND – there is no gap between magnet and driver. 🙁

  54. Mine died in a way that every timed I pressed the button it would buzz for one short time. Then I took it apart, there was water droplets all over the place. I dried it for 2 days on an air purifier (constant airflow). Then I put it into the case to charge, it didn’t to anything for a long time. But now the orange / amber led is on, but no flashing. I continue to charge it but it’s been like this for a day, and the case is warm to touch. What should I do? What does this tell you (constant amber light) during charging? Thanks

    1. After charging it for days, brown fluid came out from the battery. There are rusty spots and limestone here and there. I replaced the battery. It still won’t start, but all white LEDs light up for a while when placed on the charger then removed. The amber/green led doesn’t show up at all, therefore I assume no charging. The new battery is pre-charged by me on a separate charger before installing. What to do? Was thinking of spraying the whole thing with WD-40 as a last resort.

      1. Check for damaged PCB tracks on both sides of the PCB. PCB tracks can sometimes be bypassed with wires where the tracks have broken.

  55. I have an HX9340 Sonicare Diamondclean toothbrush. I have replaced the battery. Charging light comes on when unit is held over charger; LEDs stay on for 30 seconds thereafter. But the unit does not turn on when I press the power button. Any thoughts?

    Thanks very much.

    1. Is the power button jammed?

      1. No, the power button seems fine. With the works removed from the case, I press the power button, and it seems to toggle on and off fine. But the brush does not turn on. LEDs are bright when I hold the works over the charger.

        1. It could be water damage on the PCB. Did the motor run before the battery was replaced? Check for water staining on the PCB where corrosion could have broken the tracks.

          1. No signs of water damage on the PCB. It looks new. The motor did run before a replaced the battery. Other leads? Thank you.

          2. Check that the JP1 connection has been re-made and measure the voltage of the battery at the PCB if you can. It should be at least 3.7V so if not, the battery might be faulty and you’ll need to contact the vendor you bought it from if that’s the case. Other than checking the PCB for stray blobs or whiskers of solder I’m not sure what else to suggest!

  56. Hi,
    I see @Ionic Admin you are still trying to help – you should be employed by Phillips 😉
    What do you think please about this problem of my HX6930.
    I have been disablementing it due to the low vibration – I played around with the position of the coils/electromagnet and re-assembled back and it was fine. Suddenly the toothbrush powered on during night on it’s own day after but pressing the button it stopped. Then battery went dead over night I thought (I wasn’t able to charge it nor power it on – no indication). Strange is even the LEDs didn’t turn on when in charger. I thought my battery is dead (actually the readings were somehow high I guess 3.78 V (don’t recall exactly but it’s 2 years old…) so I thought that some internal charging mechanism prevents charging and powering it on. But even when battery is replaced (I have correct one Li-Ion 3.6V 680mAH), it still doesn’t react to charging nor powering on, it’s completely dead. The PCB seems to be fine, no significant water damage or something. I tried to revive all soldering – no change. The charging coil in the brush seems to be connected to the PCB and that JP1 is fully re-soldered.

    – what do you think it could be please ?
    – can I somehow test power button if it’s not KO ? (like bypass it or measure it somewhere on PBC)
    – how can I test if charging works (when periodically reading voltage when “charging without LED”, it is still constant…)
    – I will probably remove the PCB to see other side of PCB, but is there really anything which could get broken (I think it’s not the case) ?

    Seems I can’t attach PCB photos, then I can’t post.

    Thank you so much for your answers and help !

    1. Some pictures of PCB if that helps (remove spaces from links) :

      h ttps:// photos. app. goo. gl /JepvSqDfmKlQEvbD3
      h ttps:// photos. app. goo. gl /Lt6TuR2YJVS8L5IW2
      h ttps:// photos. app. goo. gl /Bce2R0CJhyg1eLX22
      h ttps:// photos. app. goo. gl /B1irzjLjJb3q9Fi03

      1. If the brush switched itself on that is likely due to water ingress. You can bypass the power switch using a piece of wire to short the two relevant switch terminals together momentarily to see if the switch is damaged. Any staining on the back or front of the PCB could show where water has damaged the PCB tracks. Hope that helps!

  57. Hiya. My diamond clean brush has all the power it did when I first got it but it seems like the power is not in the toothbrush head (I use an official head) the power seems to reside around my metal pin that holds the head to the body of the handle. With the head on there is vibration in the head when used but not as powerful as it once was.
    There is no weakness to the vibration in the handle it just doesn’t seem to reach the brush as it did before. My husband has the same toothbrush and when I attach my toothbrush head to his handle it works a treat and Powerfully. My toothbrush has also become noisier with the head on. Please help!

  58. Good day to everyone.
    Today I recharged my sonicare hx9350. After trying to switch it on the only milisecond vibration and led blink can be seen.
    No possible to switch it on.
    It never fell down or hit against anything..
    Any ideas? Thanks in advance.

  59. I have just purchased Philips Sonicare Diamond clean. I am trying to charge it for 24 hours as required before use, but once plumed into socket the flashing green light goes off after a min or so. Should it not show solid green if already fully charged. Is it faulty? A little anxious, it was very expensive. Many thanks

    1. As this is a new brush, try using it as instructed for a week or two without any further charging and see if it works as expected. If it doesn’t then return it to the shop as faulty.

  60. Hello. Thanks for this blog and removal instructions of the battery from my hx9340. have the new battery used and soldered after instructions again. as soon as I insert the toothbrush into the charging case, the battery symbol lights up; after removing, shortly all leds go on simultaneously and go out again. nothing works after that. what could it be?

    1. Did the motor run at all when you tested it after soldering in the new battery? New li-ion batteries generally have 50% charge. Check that the JP1 solder connection has been made and that there are no stray blobs of solder causing a short circuit on the PCB. Also check the PCB for staining from water damage.

  61. Hi there my battery died and I would love to find a 3rd party repair service or something as I wouldnt feel confident in the slightest replacing the battery myself. Any one know of any service existing?

  62. Hello, my brush turns on and runs perfectly, but it makes me cycle through all 5 modes before turning off. Any idea what it could be? I tried reset, etc without any luck.

    1. With the DiamondClean do you need to hold the button in to make it switch off without cycling through the brushing modes?

      1. No, I have a 2nd one and it turns off with a standard press.

        1. I’ve had a try with our test DiamondClean brush. If you try to switch off the toothbrush immediately after switching it on you have to cycle through the 5 modes. If you switch the DiamondClean on and let it run for a few seconds it will then switch off with one press of the button. Does that work for you?

          1. This was it, thank you!

  63. Hello ,
    My brush is not work. Maybe the PCB has water damage.
    Do you know how to check PCB test point?

    1. Check for staining on both sides of the PCB. There can be corrosion on the PCB tracks near the staining.

      1. Thank you for reply.
        Yes,there are corrosion on it.But I want to know which chip or part has been dead,so does the test point on PCB helpful?

        1. It is most likely that a PCB track is damaged. Try to check the continuity of each corroded track.

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