First, it is caused by abnormal power supply:

1. Check whether the power supply of the power supply is working properly. Is the lamp light up? If it is not turned on, please check whether the power supply is connected;

2. Check whether the power cord of the lamp bead is the same as the positive and negative power supply of the power supply supply. If there is a negative phase, if there is the above problems, please connect correctly.

Second, LED lamp beads for voltage requirements:

LED lamp beads named 3V, in fact, different colors have different requirements for currents. The yellow requires the smallest current, which is red, green, white, and blue in order. If the current is too large, the core will be burnt.

Use a 2.4V charging battery, yellow is easy to burn, because even if the voltage is not large, the current is too large, it will still be burnt at will.

When using the button battery, although the buttock battery voltage is 3V, because the buttons of the buttons are small, the 3VLED lamp beads will not be burned. Therefore, when using LED lamp beads, you should choose the right power supply, pay attention to the voltage, and the current.