How to repair the led energy-saving lamp broken? Maintenance method of led energy saving lamp
LED lamps are widely used nowadays, whether they are in the home or not, but the types are different. As an electrical appliance, its failure is relatively small, the decoration effect is also good, and it is more energy-saving, so many people I will choose, but it is inevitable to encounter a broken situation in life, so how to repair the broken LED energy-saving lamp? What is the maintenance method of led energy-saving lamps? Don't worry, BENWEI LIGHTING is here to explain it to everyone, let's take a look.
How to repair the led energy-saving lamp broken?
1. There are two reasons why the LED light does not light up: First, the excessive leakage current of the LED causes the PN junction to fail, and the LED light does not light up. This situation generally does not affect the performance of other LED lights. Work; secondly, the internal connecting lead of the LED lamp is disconnected, causing no current to pass through the LED, resulting in a dead lamp.
2. To check and repair the LED lamp, you can use a flat-head screwdriver to carefully pry open the metal screw of the lamp holder of the LED bulb and the main plastic joint of the bulb, and keep it intact to facilitate the restoration after repair. After opening, first check the electronic components of the conversion part. If there is no problem, then power on to check its output voltage. If it is a 2W LED bulb, the output DC voltage measured with a multimeter is 105.5V, indicating that the fault is in the LED light-emitting component part.
3. If the LED bulb light-emitting component is disconnected from the power supply part, then try to separate the plastic bulb from the plastic body to which it is connected. Since this part is glued firmly, it may not be completely separated, and the plastic bulb will be damaged, but it does not matter if it is broken. After repairing, it doesn't affect the luminescence, it just doesn't look good.
4. After repair, insert the green shell paper commonly used by electricians for insulation into the metal screw of the lamp holder. The round green shell paper is put into the plastic body to separate the LED light-emitting elements from the electronic components. So, how to find out which group of light-emitting elements is broken? The resistance Ok block of a mechanical multimeter can be used to find out the broken points. Use the red and black test leads of the multimeter to test at the two ends of the LED light-emitting element. You can face each other, cross and exchange the red and black test leads to test. After measuring all the points, use paper to draw each group of light-emitting components and the three light-emitting points in each group, and write down the ones that do not emit light for comparison and removal.
Maintenance method of led energy-saving lamp:
1. Overhaul of LED energy-saving lamps with obvious damage to the components
1. If the high-frequency transformer B is damaged, use ∮0.32mm high-strength wire to wind on the high-frequency magnetic ring of 10mm×6mm×5mm, T1 and T2 each have 4 turns; T3 is 8 turns (note the head and tail). Choke coil L: The lamp power is 5~40W, correspondingly between 1.5~5.5mH.
2. Although the fuse is not blown, the line at the incoming line is not blown and the resistance is obviously damaged, the transistor will be damaged. This may first be caused by the aging of the lamp, followed by the poor use environment, and may be caused by the loss of capacity of C1. For the first two cases, when replacing the resistors and triodes, it is best to also replace the matched C3 and C4 small electrolysis. For the latter, C3 and C4 do not need to be replaced. Because C1 works under high-voltage conditions, high-quality heat-resistant electrolytic capacitors must be used for replacement.
3. If only the resistance-capacitance parts and triode on the side of Q2 are burned out, check whether C2 has been broken down.
4. In the case of blown fuse and blown incoming line, if C1, Q1, and Q2 are intact, routine inspection and withstand voltage test must be carried out on D1~D4 one by one. Or replace all D1~D4 with high-quality products.
5. If C1 bursts, if it is accompanied by blown fuse or blown wire, all D1~D4 and C1 should be replaced.
Second, the maintenance of LED energy-saving lamps that cannot be lighted normally
1. The magnetic cores of the choke coil L and the oscillating transformer B are broken. If you change the magnetic core alone, you should pay attention to three points:
(1) Use a magnetic core that meets the requirements, otherwise the inductance value of the choke may vary greatly, which will bury hidden dangers for energy-saving lamps;
(2) The magnetic gap cannot be too small to avoid magnetic saturation;
(3) After padding the magnetic gap with a suitable pad, stick it with an adhesive and wrap it with a high-temperature flame-retardant tape to prevent it from loosening. In addition, the end of the same name of B cannot be connected wrongly.
2. The lamp filament is open. If the lamp tube is not severely blackened, connect a 0.047μF/400V polyester capacitor to both ends of the broken filament lamp pin for emergency use.
3. R1 and R2 are open circuit or variable value (generally R1 is more likely to fail), replace it with a 1/4W high-quality resistor of the same resistance value.
4. For electronic ballasts using trigger tubes, check the bidirectional trigger diodes. This tube is generally of type DB3, and its bidirectional breakdown voltage is 32±4V.
5. If the filament of a single low-power energy-saving lamp turns red or glows after it is lit, check D1~D4 for soft breakdown, whether C1 is installed reversely or leaking electricity, and whether there is a short circuit in the power supply.
6. The triode is open. If only one triode is found to be open, one cannot be replaced. Instead, a pair of matched switch tubes of the same model with a withstand voltage above 400V should be replaced. Otherwise, the lights will roll over or the tube will burn again.
7. It is common for the resonant capacitor C6 to breakdown (short-circuit) or withstand voltage reduction (soft breakdown). It should be replaced with a high-quality polyester or CBB capacitor of the same capacity with a withstand voltage of more than 1kV.
8. The light is difficult to light up. Sometimes the light tube can be lighted up or the light rolls when touched by hand. This may be due to insufficient capacity of C3 and C4 and unmatched.
9. The lights flicker continuously. If the lamp tube is not severely blackened, check D5 and D6 for false soldering or open circuit. If D5 and D6 are softly broken down or the filter capacitor C1 is leaking or defective, the light will flash continuously.
led lights
The above is the explanation of the knowledge of how to repair the LED energy-saving lamp and the maintenance method of the LED energy-saving lamp. The content is for your reference only, and I hope it can be helpful to everyone.
