LED lamps have gradually dominated the current electric lamp market due to their high brightness, low energy consumption and long life. Generally speaking, LED lights are difficult to cause problems. Among the problems of LED lights, there are only three problems: the lights are not on, the lights are dimmed, and the lights flicker after turning off the lights. Today we will analyze and solve various problems one by one.

LED light structure

There are two forms of LED lights, one is a ceiling light and the other is a light bulb. Regardless of the type of lamp, the internal structure is the same, divided into lamp beads and drivers.

Lamp beads

Open the ceiling lamp housing or the white plastic part of the bulb, and you can see a yellow rectangular circuit board inside. The yellow on this circuit board is the lamp bead. The lamp bead is the luminous body of the LED lamp, and its quantity determines the brightness of the LED lamp.


The driver of the LED light bulb is installed at the bottom and is not visible on the outside. The driver of the ceiling lamp is a black box. You need to install the driver first when installing the lamp.

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

The solution of the LED light is not bright

When the light is off, first make sure the circuit is ok. If it is a newly installed electric lamp, you should use an electric pen for measurement, 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 inspection.

Drive problems

The lights are not on, and the driver is the problem. The light-emitting diodes have high requirements on current and voltage. If the current or voltage is too large or too small, they will not be able to light normally. Therefore, the constant current driver, rectifier, voltage regulator and other devices in the driver are required to maintain use.

If the lamp beads do not light up at all after turning on the light, the driver should be considered first. At this time, a new drive can be purchased for replacement.

Solutions to dimming the brightness of LED lights

This problem should be solved by contacting the previous one. This may be the case when the brightness of the electric lamp is dimmed or not bright.

Lamp bead problem

The beads of LED lights are divided into strings, and the beads on each string are connected in series, and the strings are connected in parallel.

Therefore, one lamp bead on this string is burnt out, which will cause this string of lamp beads to not light up. If there is one lamp bead burned in each string, it will cause the entire electric lamp to go out. If there is one lamp bead burned out for each string, the capacitor or resistance on the driver must be considered.

The burnt lamp beads and normal lamp beads can be seen from the appearance. The burnt lamp beads have a black dot in the middle, and this dot cannot be erased.

Inside the red circle are burnt lamp beads

If the number of burned lamp beads is not large, the two soldering feet behind the burned lamp beads can be soldered together with an electric iron. If there are too many burned lamp beads, it is recommended to buy a lamp bead board to replace it, so as not to affect the brightness of the lighting.

The solution of flickering after the LED light is turned off

If the light flashes after the light is turned off, first check the wiring problem. The most likely problem is the zero line of the switch control. At this time, it is necessary to make corrections in time to avoid danger. The correct method is to switch on and off the live wire and connect the neutral wire to the electric lamp.

If there is no problem with the circuit, it is possible that the LED lamp has generated a self-induced current. The easiest way is to buy a 220V relay and connect the coil with the electric lamp in series. For specific reasons, please refer to our previous article: Solutions to Blinking After Turning Off the Household Electric Light.