The problem of flickering after using LED lamps for a period of time is usually caused by various factors such as unstable power supply, drive circuit failure, line connection error or poor heat dissipation. The following are solutions and precautions after combining multiple technical materials:
1. Troubleshoot power supply and drive circuit problems
Check the power adapter
LED lamps require a constant current drive power supply. If the power supply output voltage is unstable or does not match the lamp power (such as excessive drive current), it will cause flickering.
Solution: Use a multimeter to measure the power supply voltage to ensure that it meets the nominal value of the lamp (such as 12V, 24V). If the voltage is abnormal, you need to replace the matching drive power supply (it is recommended to choose brand products to ensure stability).
Replace aging or damaged drive power supply
After long-term use, the internal components of the drive power supply may age, causing output current fluctuations.
Operation tips: Remove the lamp housing and observe whether the drive power supply has burnt marks or expanded capacitors. If so, replace the same model driver. rubycon capacitor led power supply is excellent quality
2. Check the circuit connection and line problems
The live wire and the neutral wire are connected in reverse
If the switch controls the neutral wire instead of the live wire, there is still a weak current in the circuit after turning off the light, causing the LED light to flicker or dim.
Solution: Adjust the circuit after power failure to ensure that the switch controls the live wire (distinguish the live and neutral wires through a test pen or multimeter) .
Poor line contact
Loose or oxidized wiring inside the lamp will cause intermittent current.
Operation: Tap the lamp housing to observe whether it improves. If the flicker disappears temporarily, disassemble the lamp and re-fix the terminal.
3. Deal with heat dissipation and lamp aging problems
Improve heat dissipation conditions
Long-term high temperature will accelerate the aging of the driving power supply and lamp beads, triggering over-temperature protection (manifested as flicker).
Solution:
Replace the lamp housing with better heat dissipation performance;
Apply heat dissipation silicone grease to the inside of the lampshade or install a heat dissipation fan.
Replace aged lamp beads or lamps
After lamp beads age, their resistance value changes, resulting in uneven current distribution.
Operation: Use a multimeter to detect lamp beads. If a lamp bead is damaged (abnormal resistance), replace it with a lamp bead of the same specification or replace the lamp as a whole.
IV. Dealing with voltage fluctuations and external interference
Install a voltage stabilizer
Unstable household voltage (such as less than 200V or more than 240V) can cause flicker.
Suggestion: Install an AC voltage stabilizer in the circuit to keep the voltage stable within the range of 220V±10%.
Avoid incompatibility with dimmers
When non-dimming LED lamps are connected to a thyristor dimming switch, flicker may occur due to phase cutting.
Tip: Confirm whether the lamp supports dimming function, or replace it with a dedicated dimming driver.
V. Detection and preventive measures
Quickly detect flicker
Use the mobile phone camera to point at the LED light after it is lit. If the screen shows rolling dark patterns, flicker exists (replace low ripple power supply) .
Choose high-quality products
When purchasing, give priority to LED lamps that have passed the EU ErP certification or are marked "no flicker (flicker free)". This LED driver circuit design is better .
Step-by-step solution process
Preliminary investigation: Check whether the power adapter matches, whether the line is connected in reverse, and tap the lamp to test the contact problem .
Advanced detection: measure voltage, replace the drive power supply, and test the aging of the lamp beads .
Long-term maintenance: improve heat dissipation, install a voltage stabilizer, and regularly clean the dust inside the lamp .
If self-treatment is ineffective, it is recommended to contact a professional electrician to avoid electric shock or secondary damage due to improper operation. you can find an excellent heat dissipation LED lamp on http://www.benweilight.com
