1, a lamp or several lamps burned out: lamp foot welding plate to the ground or short circuit to the power supply, eliminate short circuit phenomenon can.
2, a group of light is not on: light or resistance virtual welding (elimination method: rewelding), light or resistance missing parts (elimination method: plug in missing parts), circuit board connection open (reconnection can be).
3, single light is not on: dead light (exclusion method: replace LED), pin connection welding (elimination method: eliminate connection welding phenomenon).