It may be related to scattered bead layout, large area copper coating and short heat transfer path.Most of the heat dissipation problems caused by the breakdown, add resistance to cool down.You can also directly short-circuit the bad LED on the line, constant current drive is the current does not change, the voltage changes with the load.
Does not light up under the following conditions:
1. The 5V 1A USB power supply is not used.
2. Touch the switch key, the light does not light up;
3. Do not use Bluetooth pairing connection of mobile phone or computer;
4. Selecting the projected star effect mode is incorrect.