Embodiments of a method and a device are disclosed. In an embodiment, a method for discharging an output capacitor of a power supply is disclosed. The power supply includes a primary side for receiving a signal to be converted and a secondary side for outputting a converted signal. The method involves detecting whether synchronous rectification (SR) circuitry at the secondary side is inactive, determining that the primary side is disconnected from a mains voltage when the SR circuitry is detected to be inactive, and discharging an output capacitor at the secondary side based on the determination that the primary side is disconnected from the mains voltage.