Hallo, sir @rmm31
You have presented us with a very beautiful post where you have a mobile phone:Samsung Galaxy A40.You have cleaned the charger pin of the mobile phone very nicely.You removed the copper from it and applied it with a soldering iron, meaning there was no short circuit. I really liked every step you took and it was the right advice.Finally, you have succeeded, meaning the mobile repair work has been completed and the charger's pin logo has been displayed.