***Question***: ***Loose part on circuit board***
Answer: Do the following steps below. If that doesn't work, you'll have to replace the entire LG phone. Also you can read the user manual that came with it.
***Solution***:
Start by cleaning the burnt area with a saturated swab or IPA liquid (if it's burnt). Then, use an appropriate razor knife to remove the loose materials from the board. After that, you will have to apply epoxy resin on the damaged parts and reestablish the wiring connections.