hi i am a newbie and i have been tinkering with a soldering iron lately i have no training anyway my problem is that i was desoldering the wires off of a tablet mainboard to replace the battery and in the spot where the positive wire was this little piece of metal that i assume connected to the board came off from the board and now i cant solder the wire back in its place because that little piece just crumbled when i attempted to put it back but even if it didn't crumble i don't know how i would have gotten it to stick in place anyway so now there is only an empty square on the mainboard where the positive wire is supposed to go so my question is how or can i fix this any help would be greatly appreciated i can add pics if needed just let me know thanks