Braun 3756 Series Toothbrush won't recharge after changing battery
This is the third one of these I've ended up doing now, and the only one that did not go successfully. For reference, the insides of it look similar to what is shown in this video. After I installed the battery, the brush roared to life, but it seems to not charge up completely or properly somehow. I've yet to measure voltage on the battery, (will try to do that next weekend) but the pitch of the motor is slow enough that I don't think that the actual charging mechanism is working properly. When placed into the charging dock, it lights up and seems to recognize it, and eventually finishes its routine a number of hours later, but it doesn't seem that the battery has recharged at all.
After studying the unit more closely, there seemed to be a break in the coil wire, so I unwound one rotation and soldered (what I thought was) the unbroken loop back up to where it's supposed to go. Unfortunately, the problem has not gone away. Is it possible that the coil is broken further in? If so, does anybody know how it could be that it is even lighting up and recognizing the dock at all? Is my best bet to get a parts unit to salvage a good charging coil out of?
After studying the unit more closely, there seemed to be a break in the coil wire, so I unwound one rotation and soldered (what I thought was) the unbroken loop back up to where it's supposed to go. Unfortunately, the problem has not gone away. Is it possible that the coil is broken further in? If so, does anybody know how it could be that it is even lighting up and recognizing the dock at all? Is my best bet to get a parts unit to salvage a good charging coil out of?
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