Fireproof Mobile Phone Charger,

Line failure

Wiring failure, including the power cord is damaged and not powered, the touch port is oxidized and the touch is poor. Focus on checking whether the input line and output line are energized.

If a wiring problem occurs, it can be resolved by replacing the power cord.
 

the output voltage is too low

The following are the main reasons for low output voltage:

1 Switching power supply load short-circuit failure (especially DC/DC converter short-circuit or failure, etc.), at this time, first disconnect all loads of the switching power supply circuit, and then check whether the switching power supply circuit is faulty or whether the load circuit is faulty. If the load circuit is disconnected and the voltage output is normal, it means the load is too heavy; or if it is still abnormal, it means the switching power supply circuit is faulty.

2 The filter capacitor or rectifier diode failure at the output voltage end can be judged by replacing it.

3 The function of the switching tube is reduced, causing the switching tube to fail to conduct normally, and the internal resistance of the power supply increases, which can reduce the load.

4 The switching transformer is defective, not only the output voltage drops, but the switching tube is insufficiently excited, which damages the switching tube.

The 5300V filter capacitor is not enough to form a load power supply. After connecting the load, the output voltage will drop.