crwdns2933423:0crwdne2933423:0

Braun Oral-B Sonic Complete 4729 Battery Replacement

crwdns2942213:0crwdne2942213:0

  1. Braun Oral-B Sonic Complete 4729 Battery Replacement, Opening the bottom lid: crwdns2935265:01crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Opening the bottom lid: crwdns2935265:01crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Opening the bottom lid: crwdns2935265:01crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Take the device and place it on top of its charger.

    • Now hold down firmly the charger and pull the top of the toothbrush backwards.

    • Just above the lid there is the induction coil, so don't pull too much, or it could get damaged!

    • When the lid at the bottom opens, stop pulling and take it off manually

  2. Braun Oral-B Sonic Complete 4729 Battery Replacement, Pull of the water protection ring: crwdns2935265:02crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Pull of the water protection ring: crwdns2935265:02crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Pull of the water protection ring: crwdns2935265:02crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Take the screwdriver (or the plastic opening tool) and go under the ring at the top of the gummed area.

    • Now rotate it slightly so the ring comes loose.

    • Be careful not to damage the gum under the ring, as it assures that no water gets inside!

  3. Braun Oral-B Sonic Complete 4729 Battery Replacement, Take out the interior: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Take out the interior: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Take out the interior: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Push the point of the device down onto the table and take out the inside.

  4. Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 1): crwdns2935265:04crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 1): crwdns2935265:04crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 1): crwdns2935265:04crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • First take away the metal sheet of the start/stop button.

    • Then pull the center of the black metal connection of the pressure sensor slightly upwards until the hook holding it to the sensor comes loose.

    • Now it has to be desoldered from the logic board.

  5. Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 2): crwdns2935265:05crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 2): crwdns2935265:05crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 2): crwdns2935265:05crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Now you have to desolder the sensor connection and both the connections to the red led at the top.

    • The white plastic pins left and right to the led connections can easily melt!

    • Then desolder the connections to the charging coil.

    • Be careful not to touch nearby electronic components, as they could get damaged!

    • And keep the soldering time short and remove the soldering iron as soon as the solder has become liquid, so there is no overheating risk!

  6. Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 3): crwdns2935265:06crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 3): crwdns2935265:06crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 3): crwdns2935265:06crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • First pull off the white plastic support for the red led.

    • Then push the plastic casing of the battery together to pull of the coil.

  7. Braun Oral-B Sonic Complete 4729 Battery Replacement, Clearing the way for the battery (Part 3): crwdns2935265:07crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Now the connections to the motor have to be desoldered to take the battery casing of.

crwdns2915888:0crwdne2915888:0

To reassemble your device, follow these instructions in reverse order.

crwdns2935229:04crwdne2935229:0

TheFixaholic

crwdns2935283:004/27/15crwdne2935283:0

573 crwdns2915208:0crwdne2915208:0

crwdns2935297:02crwdne2935297:0

crwdns2944067:02crwdne2944067:0

A good guide but I found removing the bottom quite troublesome. Levering against the charging base felt like it would break the base. I needed to lever it in stages, wedge it and grab and pull it with mole grips. This damaged the plastic a little, but I got it off.

Cone - crwdns2934203:0crwdne2934203:0

Hmm, maybe they changed the construction. When I created the guide the bottoms (of the 2 toothbrushes I repaired) opened quite easily, but that's good to know.
Also I do not think you need to worry about breaking the base: as most chargers that you plug in the mains, it should be completely filled with a hard resin, and thus be almost indestructible.

TheFixaholic -

crwdns2917038:0crwdne2917038:0

crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 11

crwdns2936753:07crwdne2936753:0 41

crwdns2936753:030crwdne2936753:0 150

crwdns2942667:0crwdne2942667:0 6,658