Hi all: I am kind of new to pcb troubleshooting and I am having the hardest time trying to figure out this card. The purpose of the card is to dispense flux to be used in conjunction with magnetism. The problem I am having is figuring what components tie in with each other. I do have one noticeably problem on the card but I can't tell if there is anything else wrong with it because I dont know what components are together. The one part that is surely damaged is the BD682 darlington transistor. Is there a better way to diagnose the board without supply power to it and without removing each component? In other words is there a way to breakdown the board if you cant see what all is connected together? Please see attached picture of the card!