1. The ground wire between the LED controller and the lamp is not connected. This situation often happens. Many people tend to pull only one signal wire from the light string into the controller, and the negative pole is connected to the transformer. This approach is not standard, because sometimes when the transformer has multiple outputs, their negative poles are not necessarily connected together, which causes the controller and the light string to have no common ground and the lights flash randomly after being powered on quickly. . Therefore, when wiring, be sure to wire as required to avoid such errors.
2. The effect made in the SD card is wrong, and the lamp chip selected when making the effect does not match the chip of the actual lamp. This situation is caused by the programmer who chose the wrong IC model when doing the program. The elimination method is to redesign the program.
3. The power supply voltage of the lamp is insufficient. This situation leads to many random flashes. Everyone must use 80% of the transformer's nominal power when calculating the number of transformers. If the power of some transformers is imaginary, it may even be calculated at 60%. So try not to choose a transformer that is too bad.