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LED Common Malfunctions and Solutions

Aug 23, 2019

LED Common Malfunctions and Solutions

LED lamps gradually occupy the current market of electric lamps due to their high brightness, low energy consumption and long life. In general, LED lights are difficult to be broken. In LED lights, there are three common problems: the lights are not bright, the lights are dimmed, and the lights are blinking after turning off. Today we will analyze each problem one by one.

LED light structure

LED lights have many forms. Regardless of the type of lamp, the internal structure is the same, divided into a lamp bead and a driver.

Lamp beads

Open the outer casing of the LED lamp or the white plastic part of the bulb. You can see that there is a circuit board covered with a yellow rectangle inside. The yellow color stuff on this board is the lamp bead. The lamp bead is the illuminant of the LED lamp, and the number thereof determines the brightness of the LED lamp.

The driver or power supply for the LED light is mounted on the bottom and is not visible from the outside.

The driver has constant current, step-down, rectification, filtering and other functions.

The solution to solve the problem when LED light is not bright enough.

When the light is off, you should first make sure that the circuit is ok. If it is a new light, use an electric pen to measure, or install an incandescent lamp to see if there is voltage in the circuit. After confirming that the circuit is ok, you can start the following troubleshooting.


Driver or power supply problem

The lights are not lit, and the problem is caused by the driver. Light-emitting diodes have high requirements on current and voltage. If the current and voltage are too large or too small, they cannot be normally lit. Therefore, constant-current drivers, rectifiers, and bucks in the driver are required to maintain their use.

If the lamp is not lit after turning on the light, we should first consider the problem of the driver or power supply. If it is checked that it is a power problem, you can directly replace the new power supply.


The solution for LED light brightness darkening

This problem should be solved together with the previous question. This may be the case if the brightness of the light is dim or not lit.

Lamp bead problem

The LED beads of some LED lamps are connected in series. The beads on each string are connected in series; and the strings are connected in parallel.

Therefore, if a lamp bead burns on this string, it will cause the string of lights to be off. If each string has a lamp bead burned, it will cause the entire lamp to be off. If there is a bead burned in each string, consider the capacitor or resistor problem on the driver.

The burnt lamp bead and the normal lamp bead can be seen from the appearance. The burnt lamp bead has a black dot in the middle, and the dot can not be wiped off.

If the number of burned lamp beads is small, the two soldering feet behind the burnt lamp bead can be soldered together with a soldering iron. If the number of burned lamp beads is too much, it is recommended to buy a lamp bead to replace it, so as not to affect the brightness of the lighting.


Solution for blinking after the LED is turned off

When you find out the problem of flashing occurs after the lamp is turned off, confirm the line problem firstly. The most likely problem is the zero line of the switch control. In this case, it is necessary to correct it in time to avoid danger. The correct way is to switch the control line and the neutral line.

If there is no problem with the circuit, it is possible that the LED lamp generates a self-inductive current. The easiest way is to buy a 220V relay and connect the coil to the lamp in series.