De-soldering braid is pretty useless on miniature solder pads unless you've made a real cockup and used too much solder in the first place.
In your second video what he's doing when he's removed the socket and is swiping the solder pads with the soldering iron tip is removing the extra solder that's deposited when the socket was first soldered to the PCB. He then swipes a bit more off, along with the old flux, with a cotton bud. Ideally he'd like to get ALL the old solder off and get back to an unsoldered copper pad but that's impossible. Too much solder and it will bridge from one pad to another and short things out.
The solder for the joint is actually already deposited on the new USB socket connections so all that's necessary is to apply a bit of flux to the PCB pads, place the socket on the PCB so the connections are touching the pads and apply enough heat to melt the solder but not enough to affect other nearby components or damage the PCB.
Do NOT use the flux in your link. Plumbing flux is corrosive to electronic components, you need flux made specifically for soldering electonic gear.
Last edited by: Kevin on Wed 17 May 23 at 17:32
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Solder mobile repair new
Solder mobile repair new
