Switching power supply fuse burned or fried
Mainly check the large filter capacitor on the 300V, the diodes of the rectifier bridge and the switch tube, etc., the problem of the anti-interference circuit will also cause the fuse to burn and turn black.
Note: The fuse burning due to the breakdown of the switch tube will generally burn out the current detection resistor and the power control chip. Negative temperature coefficient thermistors are also easy to burn out together with insurance.
