To fix the burn in the circuit board you have to have a soldering gun, flux paste, tin- lead and good soldering skills. To repair , first you have to find the area that has the open circuit, then remove the green material that protects the cooper for corrosion. Put a bit of flux paste on the expossed part of the circuit that we previously peel. Then solder the area putting a bit of tin-lead. Find a piece of wire (small caliber..18-24 gauge)to make a bridge in the 2 areas.