Supor electric pressure cooker keeps ringing when it is powered on, all the indicator lights flash and the buttons don't work. I took it apart, but I don't see any problem. Take the power board capacitance as an example. You should check the power circuit. If it is a resistance-capacitance step-down power supply circuit, you should focus on the capacitor with a nominal value of 105/400v, which is generally caused by the reduction of this capacitor capacity. His appearance is brown, and he has a large volume, which is a polyester film capacitor. It is better to measure this capacitance with a digital multimeter, but it is not easy to measure it with a pointer multimeter. Hope to adopt