Flickering CFL after the CFL is turned off
What’s the matter with the CFL flickering
There are two The reason can cause fluorescent lamps and energy-saving lamps to flicker after they are turned off.
The first switch controls the zero line. If all fluorescent lamps have this problem, switch the load line under the main switch. If it flashes individually, put the flashing one on the lamp position. Change the zero fire and let the switch control the live wire.
The other is the one with a small light on the switch, the one that turns on when the light is turned off, just remove it.
Failure maintenance of energy-saving lamps
(1) The power supply part, this place has only four diodes and a large electrolysis, Generally, if there is a reverse insertion or a breakdown, the red light will flash when the power is on, and this part is easy to see. If the polarity of the large electrolytic is reversed, the red light will be on. Remember, don’t power on for too long in this case, otherwise it will be very dangerous.
(2) The starting part, there are two situations in this place, some use the small electrolytic starting method, some use the DB3 starting method, the small electrolytic starting is slower, and is mostly used for low-grade lamps and electronic components You all know it. I don’t need to explain the principle. There are many on the Internet. If there is a problem with this part, you can check it like this. When you see that the light is not on, after you have ruled out the problem of the lamp tube and the components are inserted backwards, you should check the starting circuit at the first time. You can check this way, we power up the light, and then use Put the tweezers on both ends of DB3 or electrolysis and then release it. The action should be very fast. If the light flashes once, it means that there is a problem with this part. Check the non-polar capacitor in the DB3 circuit and the DB3 itself. In this case, use a substitute method, but generally DB3 is more bad. In circuits using small electrolysis, its capacity is much insufficient. At the same time, in these two circuits, large resistors are rarely damaged, and maintenance should be flexible, otherwise time will be wasted.
(3) High-frequency self-excited oscillation circuit, this part depends on the magnetic ring and the two switch tubes. Generally, when I repair, I use a test light to power on the two ends of the two switch tubes to measure , if the test light is flashing, there is 75 indicating that the triode is good, if the test light is always on or not, you should replace the triode. There is a situation like this, one side of the triode is good, the other side has been opened, but the test light always flashes, it seems to be normal, this depends on your experience to judge, generally in this case, one side is always bright and dark and the other side is flashing. Faster and brighter. If you measure that the triode is fine, you need to check the inductance. The inductance is still bad. You can make a lamp to check the inductance. In this way, use an inductance and a 0.022uf electrodeless capacitor in series. At the same time, use a good lamp and connect it together, and then connect the primary and resonant capacitors of the inductor under test. If the lamp can light up, change the inductor. If it does not light up, it indicates that there is still a problem with the previous circuit. This time, we will check the resistance. This resistance check is for small resistance resistors. Connect to the base of the triode, and those within 1 ohm or 1.5 ohms are connected to the emitter. At this time, you can only use a multimeter to measure. We measure directly on the road. For time, pull the gear to 100 ohms and directly connect At both ends of the resistance under test, the test leads must have run out to indicate that 0 ohms is good. You may ask, can it be measured in this way? I want to tell you that this circuit works under high voltage, and it is easy to burn open circuit, which is quite a lot.
It should be noted that if you encounter an aging lamp, you measure that one side is burnt and the other side is good, so replace both sides at the same time, otherwise you will repair it when it ages. If it is still not bright, you have to check the magnetic ring. Maybe the magnetic flux is too low, and if it is too high, the triode will get hot or burn out. This can only be repaired by substitution. If you change the magnetic ring and it still doesn’t turn on, don’t hesitate to replace the starting capacitor connected in parallel with the lamp. How is it, the lights are on, what? It is not yet bright, please start from the beginning, be serious, careful, and patient. There are not many parts in the energy-saving lamp circuit. The above mentioned are all carried out under the condition that the circuit board plug-in is normal and there are no cracks in the copper-platinum circuit.
If you find that the filament is broken on one side of the lamp tube, but the blackening of the lamp tube is not serious, use a 0.033uf electrodeless capacitor at both ends of the broken filament, so that it can be used for a period of time in an emergency. . What you said about short-circuiting the filament or connecting the resistor, this method will not work, because this will increase the load and burn the transistor and resistor.
