Thanks Steve and also all who have contributed to this fix.
In the above images, I cannot see exactly where the positive / negative are attached to the board, but going by a post from fenilsen, it appears to be either side of the capacitor.
Also presuming this is Lead free solder. I don't think I am located near you (Australia).
The USB DC Converter drops 9v (or 12v or 24V) down to 5v. How would the converter handle a 5v / 1A input that came from the original USB adapter? (ie. 5v to 5v) I ask this because sometimes it is convenient to power the G10 receiver from a phone power bank when AC mains is not available. Also, I don't use a pedal board.