in today's video we have another deviation from our normal car content i get a little bit geeked
out on fixing things and doing things myself i've got these oral b professional care toothbrushes
that i've had for maybe five or six years the battery's gone dead on them they don't even
hold charge for more than like one cycle the one on the right we have is a precision 4000
and the one on the left precision smart series 5000 the difference between the two is the one
over here on the left has bluetooth in it that whole bluetooth thing on there is a complete
gimmick all it does is like broadcast to an app on your phone where you can watch news or you
can read news while you're brushing your teeth or you can keep the progress of your brushing
and all that so what you're going to need to do this replacement is the batteries obviously which
i got over here you'll need the original power supply so you can unscrew the bottom
i've got some bleach and a container over here so i can put the parts in that i take apart
and clean them up before i put them back together they're full of toothpastes and other stuff that's
grown on them over the years so i want to clean those up before i put them all back together and
then you'll need a soldering iron and a soldering pump to remove the solder that's the hardest part
that most people won't have access to or don't have one i've got a little semi-professional setup
over here because i do a lot of soldering and tinkering around so i've got that over here to use
so the first thing we got to do is unscrew this thing so that you notice on the actual charger
they got this little stem and it's got a little shape on it so you put it in there you just turn
it quarter turn lefty loosey righty tighty once you do that you should be able to pop the lower
cap out this thing is usually dirty as hell so you just want to throw it in your solution and
wash it now you got to take this cap off so this cap is usually stuck on there because
you get toothpaste and all kinds of other crap that gets stuck here around the rim so what you
do is just kind of take you know hold it tight take your your thumb and just press it sideways
and it should pop right out so you just pop it out and just be careful and then this thing is
probably dirty and full of crap and mold too so you just drop it in there they wash it so
in here you're going to have the little ring for your inductive charging so you want to be careful
with that that you don't damage that the next thing you want to do up here on the top of the
head right at the base there's another little ring that goes around here so you take your flat head
screwdriver just get it in there without damaging your toothbrush this thing might go flying
as you get it tucked in there but you just want to get it in there and loosen it around if it's
got toothpaste buildup and things like that you want to clean that up or at least get that out of
the way so you can wedge this thing between kind of go around the edge and then it pops right out
this thing's pretty dirty so just drop it in there to clean so now you got everything pretty
much loosened up so the next thing you want to do is you want to look inside you'll see
there's two little retaining clips on either side so you just kind of pop it inward out of the way
and the easiest way is you pop it out like kind of put it on the table put on the ground kind of
put a little bit of pressure on it and just pop it up release the clips and then right there so
it should slide right out and then just slide the whole thing out all right so i got this out
yeah this thing is full of crap on the inside looks like there's been leaking this top part
is like rubber so it must not have sealed well so i'll probably just end up soaking it in here too
just to clean out everything inside before i put it back together i can see a bunch of corrosion
in here that must be my issue on this one oh man the back of this thing's full of corrosion
from water getting inside i might get into there and kind of clean that up so this is
the 42 millimeter battery and it looks the same size it's not doesn't have the same markings as
the oem batteries just a green battery that says japan on it they claimed it was the same
brand the fdk brand from the seller we're going to have to clean this up a little bit and then
so this thing uses a 42 millimeter battery they make two different batteries for this there's
a 48 millimeter or 49 millimeter that some of these toothbrushes use so you might have
to open yours up before you order a new one just to make sure you know what battery you
have so you order the correct one so when i was handling this this little led indicator thing
fell off right here so it looks like it was attached to these little strings that come
up from here and over around it's the indicator for the back of this guy so that thing fell off
about to find another led and just and replace that one before i get started i'm going to open
this one make sure that one isn't corroded before i clean everything up and continue with this
so this one came out much cleaner it looks like there's been no leaks or anything inside this guy
everything's still intact even the led and everything so obviously this guy had a big
issue with just infiltration with corrosion so i might clean that up and make sure it really didn't
damage anything so we'll go ahead i'm gonna do this one last because i gotta take it apart to
clean up all this stuff i gotta desolder the motor from the board just to clean that and get
that fixed up so i'm going to do the other one the 4000 first first thing you want to do is make sure
that you remember the orientation so this one has positive going upwards so you got to remember that
as the terminal and then there's a little spring here so you can just pop that spring out for now
and uh get that out of the way since this this one uses a shorter battery
they put a little spacer spring in there i want to get my solder pump let's get this baby ready
now i got my soldering iron it's heated up so you want to do is just kind of put the tip onto there
and just wait for it to melt yeah just put it on here and let it melt and then it just sucked up
i do a couple times just to get all the residuals out
so that one's good flip it over and do the other side
so the negative terminal is still kind of stuck so you probably want to get some tweezers in there
heat it up and just pull it off with some tweezers and if you really get stuck on
this you can always just clip this thing off since you're gonna you don't really need these
terminals anymore for the new battery so that's gone so that's good so you want to flip it over
just you want to bend these things straight so you get them through
and just pull the battery out pop it out of the plastic thing first
so this one you'll notice the positive terminal has got a weird angle to it
so you're going to have to bend your new one the same way just to get it
in there correctly it looks like it is made by the oem manufacturer even though the battery
is not the same if you look on the back side of the replacement one the new one it's got the same
uh logo the hr logo you want to just copy the same bins for your new one
line them up through the same holes and just get them fished through so we got everything pulled
through just make sure you get the things lined up correctly on both sides back here and then on the
bottom and top everything is good you have plenty of clearances you want to just re-solder
everything so you just make sure you have your soldering iron ready so for soldering you just
want to lay it on the pad let it heat the pad up and then let the solder melt right on and spread
through the pad and the tinning i'm going to use some tweezers because i can hold it
down and let it dry for a second so just hold the tweezer down and let it spring up on you
once you get a nice clump of solder on there just heat it back up
use your tweezers to let it set on place
so we got this baby soldered up you can see that the
little globs look like the oem glob so this one should be good to go
i'm gonna continue desoldering the other one and taking that apart on a time lapse just to get it
through and fix that side and we'll see how bad the damage is in a little bit
so if you guys are watching this far into the video obviously you want to see what's going
on with this broken one or this rusted one so i desoldered it and i it's really just held on by
just these two guys down here i had these soldered a third one right here which i didn't need to
right in the middle and it looks like that's the little sensor right here for like when you're
brushing too hard this thing warns you i'm gonna just resolder that back since it's not needed
for this cleanup but i gotta clean up all this corrosion with a little bit of white vinegar right
there and then i might spray this guy down with some white vinegar clean it up and then probably
take like a steel wool or something and scrub all this surface rust off here once i do that
i'm going to redo this led up here that corroded off and then put this thing all back together
so i got this thing pretty cleaned up good enough with the steel wool and
some white vinegar got most of the corrosion rust off so i've got a new
led right there that i'm going to replace over here there is a little piece of wire that i
replace so i've got this little thin piece of wire then i notice on the other toothbrush the motor
right here has a little capacitor right there and then this motor doesn't have one
so in my electronics kit and i found a capacitor that's the same physical size i don't know if
it's the same exact rating but good enough all it really is is to help kind of buffer
that initial start on these motors so i'm going to go ahead and just solder that in just like the
other toothbrush to match and once i get all that done i'm going to put it all back together
i am going to put a little bit of white lithium grease i put the lithium grease right there into
that gear motor just to grease it up since it's probably gone by now from all these years of use
so i got this baby all cleaned up all the solders are nice and clean right there you can see i did
re-hit a lot of these big solder joints just to make sure none of them corroded away and they
make better contact got the battery all tucked in there nicely with the little lead right there just
tucked into the hole everything's good clean this baby up i'm gonna put that lithium grease in there
and test this baby out i got that lithium grease in there i just put a little dab in there and
i used my little screwdriver to get it into the gears i also did it on this toothbrush right there
i replaced that led right there you can see i we had to replace that one wire on this side that was
way too corroded and torn up i reused the wire on this side i put a little dab of solder there just
to clean it up and everything should be good now so i'm going to put it all back together
and let this baby charge and then we'll test to see if this baby runs
so i've let these babies charge for like 10 or 15 minutes just to make sure they work so it looks
like this thing is working fine turn it on you can see the battery is blinking because it's so low
but it's running so this one over here which was the 4000 this thing's also running perfectly fine
you see it's blinking the red because the battery's low so this ended up being a pretty
good fix for these like you know originally i bought these for maybe like a hundred bucks
and this one was like 80 bucks a perfect uh you know 18 fix if you guys are looking for these
parts i'll have the links in the description to where i bought these on amazon the batteries
also if you guys don't already have a soldering iron or soldering station like this one i'll have
a link for this one this one is a big game changer for me i've been doing a lot of surface mount
soldering and the air side of this is freaking awesome as hell this one goes up to 480 degrees
which is nice because it warms up really fast and it melts the solder really quick so a lot of my
soldering is much faster now with this i've been so used to the regular ones where i plug into the
wall which are only like 30 or 40 watts this one's like 90 watts so that makes a huge ass difference
in how fast and how good your solders are so you know if you guys are looking for some of
these tools i'll have a description but anyways if you found this video useful give it a thumbs up
if you haven't subscribed to your channel i have a lot of diy content on my channel most
of it is car related but once in a while i kind of do these little around the house diy projects
and i post the videos on them so anyways thanks for watching and i'll talk to you guys next time
you