How do I know that this piece was not damaged when I was sticking weld

@danook something seems to get lost in translation. Looks like your connector got melted and there seems to be some damage to the right of it as well. You need to post a better (clearer) picture so we can check it out better. You will need to resolder a new connector to the board to fix this. Use either a smaller tip on your soldering iron or a good hot air station to solder it on. Cover the connector with plenty of mylar tape and use plenty of flux. If in doubt find some old circuit boards with plastic connectors and try to solder/desolder those for practice.