I don't know how good you are at soldering, but both ends are labeled. I zoomed in on the board with the disconnected wires; and it's labeled (VCC on the top, GND in the middle, and PWM at the bottom). After closed inspection it appears as if someone either repaired it before or someone already tried to solder it (appears to be solder paste smeared on the board and the wire) If you're not confident that you can do it, find someone who can solder; it seems like a simple fix. If you send it back you could be waiting a while. Hope you get it fixed...keep us posted.