Fixing a cordless drill battery charger

Unfortunately the circuit boards come as a one piece unit and dewalt do not sell parts for it. If the component has three legs it is a diode, and you may be able to get one from an electrical wholesale shop. You can try and remove the faulty component from the board and take it somewhere and get it matched up. The components can be hard to resolder back onto the board as it is mainly pcb and has a protective layer that isn't conductive. You have nothing to lose in trying a diy repair as if it doesn't work you will need to replace the charger, and if you don't fancy your chances you will have to buy a new charger. Most modern chargers consist of two parts only, the housing and the circuit board. To replace the whole circuit board is a write off I'm afraid.

usually transistors have three legs, diodes have two arms all very confusing isn't it? resistors have two arms as well but not three legs or only two legs and no arms its all about arms and legs isn't it do not attempt this repair if you live at home