? 2. The filter capacitor fails. Simple LED lights generally rectifier AC directly after capacitor step-down, and then power LED lamp beads through capacitive filtering. If the filter capacitor fails, the voltage will be unstable and the DC voltage will be low, thus dimming the LED light. Use the capacitor file of the multimeter to measure the capacity of the filter capacitor. If the error is large, the error is greater than 30%, indicating that the capacitor has deteriorated. Replace it with a capacitor whose voltage value and capacity are greater than or equal to the capacitor parameters.
3, the capacitive step-down module is damaged, the capacitive step-down module is composed of a capacitor capacitor and a resistor in parallel, can be measured with a multimeter whether its capacitance, resistance is damaged, if damaged, find a parameter equivalent capacitance, resistance can be replaced.
? 4. The line is disconnected. Disassemble the LED light and check whether the internal input and output wiring is disconnected. If so, use a soldering iron to weld and fix it.
5, rectifier diode failure. The rectifier diode has an open circuit, short circuit and other faults, which may be caused by overvoltage and overcurrent, or it may be caused by long-term use failure. Find a reverse voltage value greater than 350V, working current greater than 0.5A rectifier diode can be replaced, such as 1N4004~1N4007 and so on.
? 6, LED constant current drive circuit fault. For this kind of failure requires a certain amount of electronics-related experience professionals to repair, for the average user, the above simple fault can not find the cause or replace a new LED light.
The led driver needs to be replaced in time after it is broken, but when it is replaced, it will be found that it is connected with the power supply and the lamp body, then it is necessary to cut off the power supply, and unplug the driver from the lamp body and the power supply, reinstall the new driver and do a good job of insulation protection measures, turn on the power again, and see if the light can return to normal, if the light does not return to normal, Continue to check whether the bulb is damaged, as long as the bulb and the driver are normal, the lamp can emit light normally and be used normally.
Now many led drivers are ASIC and patch components, personal conditions are difficult to repair, and the driver is not expensive to replace it!
Now many led drivers are ASIC and patch components, personal conditions are difficult to repair, and the driver is not expensive to replace it!