First, the reason is nothing but two situations: first, LED leakage current caused by large PN junction failure, so that the LED light is not bright, this situation generally does not affect the work of other LED lights; Second, the internal connection lead of the LED lamp is disconnected, resulting in no current passing through the LED and a dead lamp, which will affect the normal operation of other LED lights, because the LED lamp working voltage is low (red yellow orange LED working voltage 1.8V-2.2V, blue green white LED working voltage 2.8-3.2V). Generally, it is necessary to use string and parallel connection to adapt to different working voltages, the more led lights in series of LED display screens, the greater the impact, as long as there is an open internal connection of the LED light, will cause the series circuit of the whole series of LED lights is not bright, this situation is more serious than the first case. Second, LED dead light is the key to affect product quality and reliability, how to reduce and eliminate dead light, improve product quality and reliability, is the key issue that packaging and application enterprises need to solve. The following is some analysis of some reasons for the dead lamp: static electricity caused damage to the LED chip, LED chip PN junction failure, led display leakage current increases, become a resistance static electricity is a great harm of the devil, the world because of static damage of electronic components countless, causing tens of millions of dollars in economic losses. Therefore, to prevent electrostatic damage to electronic components, is a very important work in the electronics industry, LED packaging, application enterprises must not be taken lightly. Any problem in any link will cause damage to the LED, so that the LED performance deteriorates or even fails. Third, we know that the human body (ESD) static electricity can reach about three thousand volts, enough to breakdown and damage the LED chip, in the LED packaging production line, the grounding resistance of all kinds of equipment is in line with the requirements, which is also very important, the general requirements of the grounding resistance of 4 ohms, some high requirements of the grounding resistance even to reach ≤2 ohms.