Yellow : Drain (power control end, connected to pole D of the original high-power MOS power supply tube.
It is usually the middle leg of the power switch tube.
Black：GND (The ground wire of the module is 300V, connected to the negative terminal of the capacitor, and it can be directly connected to the negative terminal of the large filter capacitor on the same line.)
Red: VCC (power supply end of module, the positive pole of capacitor after rectified by feedback winding end, continuous power supply, voltage between 12V and 18V.)
White: FB (stable feedback, connected to the optocoupler 3 pins connected to the hot place, not the hot place to talk about the old optocoupler short to the hot place, and disconnect the 4 pins peripheral circuit)
Green: Start (starting pin, connected to the positive pole of 300V capacitor)
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