In this video we have got a Samsung tablet SM-T290
and it's come to us with a issue charging when we take a close look at it we can see
that there is one pin or the plastic inside the port is slightly cracked
and one of the pins looks a little bit wonky and when we plug it into the micro usb connector
we get no response
so to repair it we're gonna have to remove the back so first we will take out the sd card tray
and then using one of these plastic guitar picks insert it between the screen and the plastic back
and just work your way around sometimes you have to be quite aggressive with this and when you
hear that plastic cracking sound it's not the plastic breaking the it's the clips loosening
once you've worked your way all the way around there's no booby traps in this one
and we've just got nine screws that we need to remove these are all cross head screws nice and
easy to remove and the first one will be the battery connector at the top half of the device
once they're removed take off the shield covering the connector up
and use a plastic stick to disconnect the battery now we move on to the bottom
screws there's seven screws for these ones with the big fat heads on them
and three of them are the smaller black screws down the bottom
keep them safe because we're going to need to reinstall them later on
once the screws are removed, we need to take off the speaker assembly and we can
do that by just getting the plastic pick in there and prying it upwards that reveals
our charge port down the bottom and it's secured into place with this zip connector
remove the tape and use a plastic stick to open it up
Then gently take out the flex cable
Pry upwards underneath the charging board and we can see the damage here
I don't have a replacement charging board for this one available and the customer was in a
little bit of a rush but i did have the small micro usb port only so I’m going to swap this out
if you're swapping the whole board skip to the next part of the video but I’m
going to be de-soldering the micro usb port and reinstalling a fresh one onto the charging board
So, we get the little pcb drop it into our eye pinch board holder and cover up
the zip connector with some polymide tape kapton tape
now I’m going to mix in some low melting solder this is 138 solder wire 138 degrees solder wire
I’m going to mix that into the unleaded factory
solder so that it lowers the melting temperature a little bit
and then using hot I’m gonna heat the area up and wait for the charge port to start moving
and gently tap it with the tweezers just to see that it starts moving
and eventually it will drop out from underneath so that we can remove it
with that now removed
I’ll flip over the board
I’m going to apply some plugs
and use some copper wig to draw out the old solder with the soldering iron
my soul drying set to 350 degrees and it makes really light work of this
i just do a little bit of scratching on that pad there it looks like I’ve pulled the pad
but in fact it was just oxidized and looked a little bit grey
so once all the solders taken away I can add a little bit more flux onto the onto the five pins
and apply some 183-solder wire we're looking for nice fluffy pillows of solder on those pins and
I’m avoiding getting any inside the ground lugs on the side so that when we drop the connector on
it sits flush and then using hot air we can wait till the solder melts we can see that we've
got surface tension between the connector and the pads which means that it's secure
now we're just going to add a little bit more flux again and touch up those touch up those
connectors so that the solder covers it entirely
with that now done we can take it out of the eye pinch
flip it over again and we're going to fill those ground lugs with solder
to make sure that the port is nice and secure more flux and more solder
once that's looking tidy and neat
we just got to clean it up a little bit so we take out the eye pitch again
inspect it to make sure that it looks tidy
and then use some flux cleaner with a toothbrush
to get all that residue flux off and it was quite a bit of flux to be fair
wipe it down with the microfiber wipe and repeat on the top side
until it is spotless
now that that's clean
we can reinstall it into our tablet
and i like to use tweezers to make sure the zip connectors sit in right that pushed it nicely
so we can secure it down
and then add another bit of cap on tape on top of it so that it's double secure
you need to make sure that those pins are free on the sides as well
because there are positive and negative connections for the loudspeaker
reinstall the loudspeaker and the sort of mid frame cover
and then screw down seven
screws
once they're secure we can move on to the battery reconnect it
reattach the cover and then secure the two screws
before we put the back cover on i just want to do a little test to make sure that it's now charging
which it is
so we disconnect that
and push gently on the back cover until it sits into place
and just make sure that it's secure all the way around if it's not just give it a little squeeze
reinstall the sd card tray
and finally we can plug it in get some charge into it
and eventually the device will turn on
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