Today, Shanghai Chongming thundered and thundered. My TV set was connected to the power supply, but I didn't turn it on. Why didn't it turn on after the lightning?

This is not surprising. The voltage of lightning is about 1 100 million volts to1100 million volts (the potential difference between the two ends of the lightning channel can reach tens of thousands of volts), the average current of lightning is 30KA, and the maximum current can reach 300KA (the observed maximum lightning current amplitude is 430KA). Lightning strike can generally be divided into three stages, namely, pilot discharge, main discharge and residual light discharge. Lightning current passes through the metal conductor, and when the conductor cross section is not large enough, it can even melt, which may cause fire when encountering flammable substances. The heat energy generated by the lightning strike point is enough to melt the steel ball with a diameter of 4-6 mm, and can penetrate the steel plate with a thickness less than 4 mm. If lightning is induced on the power supply line, the generated voltage is also very high. If the TV or other electrical appliances are not unplugged from the power supply, this high voltage will penetrate into the circuit through the electric shock gap of the switch, which will breakdown the components on the circuit and cause the TV to be damaged. In addition, lightning can access the signal input circuit through cable TV network or outdoor antenna, which will also damage the TV set. So it is safer to turn off all kinds of electrical appliances and unplug the power supply in thunderstorm weather. At present, some electrical appliances are lightning-proof. The principle is that the power supply input section has a high-voltage spike pulse absorption loop composed of pressure sensitive devices (piezoresistors) to absorb the energy induced by lightning, thus protecting the following circuits. However, from the maintenance examples, some strong lightning strikes the lightning protection login circuit. So it is safe to be isolated from the outside world!