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Repair guides and support for the Braun Oral-B Triumph 9900 electric toothbrush.

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Is my 3757 Oral B toothbrush repairable? On button doesn't work

Yesterday my 3757 Oral B toothbrush worked fine; it was fully charged. This morning it worked briefly, then turned off, and finally the on button doesn’t work at all. I don’t know the age of this product—is it repairable?

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My oral b triumph v1 stopped on its own and then started up. I finally got it to stop when I placed it back in the charger. It now doesn't work. My charge indicator on my oral b triumph v1 shows fully charged. When I take it out of the charger for awhile and then put it back it indicates that it is charging.

I have taken my oral b triumph v1 apart to replace the battery. My battery has a voltage of 1.3 or close to that number.

Do you think it is the battery or is it time for a new tooth brush?

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Hi,

Possibly.

It could be a faulty power button or it may be a faulty battery that is failing to hold its’ charge and that is why it won’t start when you press the power button.

Here’s a link to the user manual that shows how to open the toothbrush so that access to the NiMH rechargeable battery (and also the Power button) is possible. Scroll to the end of the document to see the procedure

They state that in doing this that the handle is destroyed BUT here’s a link that shows how to replace the battery in an Oral B 3709 toothbrush.

Since it has the same handle as a 3757 model (it says in 3757 manual that it has a 3709 handle) it should help to replace the battery in your model toothbrush as well.

Replacement NiMH batteries with solder tags are available at electronics parts stores.

It is inadvisable to try and solder standard NiMH batteries (that haven’t got the solder tag) as you have to apply too much heat and you can damage the battery and also injure yourself if it suddenly vents explosively.

If the battery is OK then the Power button (and/or its’ associated circuitry) needs to be tested to see if it is OK. If the button is faulty then replacing it may be problematical as it is doubtful that a replacement power button part is even available. I couldn’t find one perhaps you may have better luck.

Worth a try anyway.

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@bloomnfun ,

It might depend if the battery is holding its' charge or not.

One symptom of a failing battery is that it will appear to "fully charge" voltage wise, but then when you go to use it it will discharge very quickly or even if you don't use it, it will self discharge more quickly than usual, as its’ charge capacity has actually diminished.

Even rechargeable batteries have a lifespan.

If you do decide to replace it make sure that you get a battery with solder tabs - example only (assuming its a AA size and not a AAA size) as a replacement. This way you won’t have to apply too much heat to the battery to solder it into position as you would if you just got a standard replacement battery

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