What is the possible reason why the charging indicator light of new energy vehicles is not on?

The reason why the charging indicator light of Pacific Auto Network is not on is that the filament of the charging indicator light is broken. The fuse is blown, resulting in the failure to connect the indicator circuit; The indicator lamp or regulator power cord is broken or the connector is loose; The cable head on the battery pole is loose; Ignition switch failure; Poor contact between generator brush and collector ring.

1, the power cord is disconnected, check the circuit plug in the charger, and check whether the charger 220V is normal;

2, rectifier circuit failure;

3. The circuit fuse in the charger is damaged; 4.305V voltage is abnormal, and the power management chip is damaged;

5. The charger has no output.

Only after all possible failure factors are repaired and eliminated can the battery be charged normally.

Extended data:

Maintenance method of charger failure-comparison method: just find an identical or similar charger. Using it as a comparison template, we can eliminate and narrow the fault range in many ways.

1. The power supply is not started: plug in the power supply, and the large capacitor voltage is 300V V.. Unplug the power supply and re-measure one end of the large capacitor, otherwise the voltage of 300 V will not drop. After the capacitor is discharged, replace the starting resistor. The starting resistor is in the power input part, with a resistance of 150K and a power of 2W.

2. The power supply cannot be started: after the power supply is plugged in, the second terminal voltage of the large capacitor is 300 volts .. When the power supply is unplugged, the voltage of the large capacitor slowly drops. Check whether all circuit boards are soldered, replace them with new ones after maintenance, and then turn on the power supply of the tester.

3. The indicator light flashes: Please repair the circuit board first, and then try the machine again. If it still flashes, please check the sampling resistance at the output. Connect to the negative electrode of the output line and replace the resistor with a new resistor.

4. The output voltage is high, the power is on, the voltage is higher than 70V, and the light does not light when charging. Please repair the circuit board first and then try the machine again. If the voltage is still high, please replace the optocoupler and try again, or if the output is high, replace the reference regulator and try again.

5. Squeak, fever and insufficient charging: measure the voltage when the large capacitor is energized. As long as it is lower than 300V, the capacitor is generally invalid and can be replaced.

6. The temperature is too high. Please replace the fan with a new one.

7. The output voltage is unstable. Please repair the circuit board once, then test the machine, and then replace the output capacitor 63V470UF with a new tester.

8. If the light doesn't light up when charging, use a tester to test the data, and then change to a new tester.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)