Both ED packaging companies and LED lamp manufacturers will encounter the phenomenon of LED dead lights. The main reasons are as follows:
1) Excessive leakage current of LED lamps causes PN junction failure, making the LED lamps unable to light up. This situation generally does not affect the work of other LED lamps;
2) The internal connecting wire of the LED lamp is disconnected, causing no current to pass through the LED and causing a dead lamp. This situation will affect the normal operation of other LED lamps.
Prevent dead lights
Static electricity is a very harmful evil to LED lamps. Countless electronic components have been damaged by static electricity around the world, causing economic losses of tens of millions of dollars. Therefore, preventing static electricity from damaging electronic components is a very important task in the electronics industry. LED packaging and application companies must not take it lightly. Any problem in any link will cause damage to the LED, causing the LED performance to deteriorate or even fail. We know that human body (ESD) static electricity can reach about three thousand volts, which is enough to break down and damage LED chips. In the LED packaging production line, it is also very important whether the grounding resistance of various equipment meets the requirements. Generally, the grounding resistance is required to be 4 Ohm, in some demanding situations the grounding resistance may even reach ≤2 ohm.
Static electricity from the human body also causes great damage to LED lamps. When working, you should wear anti-static clothing and wear an electrostatic ring. The electrostatic ring should be well grounded. There is a kind of electrostatic ring that does not need to be grounded. The anti-static effect is not good. It is recommended not to use it. If workers who carry this kind of product violate operating procedures, they should receive corresponding warning education, which will also serve as a warning to others. The amount of static electricity charged by the human body is related to the clothes of different fabrics worn by people and their physical constitution. When we take off our clothes in the dark nights of autumn and winter, it is easy to see the discharge phenomenon between clothes. The voltage of this electrostatic discharge is as high as 3,000 volts.
Some companies use manual welding, using a 40-watt ordinary soldering iron. The welding temperature cannot be controlled. The soldering iron temperature is above 300-400°C. Excessive welding temperature will also cause dead lights. The expansion coefficient of LED leads at high temperatures is about 150°C. The expansion coefficient is several times higher, and the internal gold wire solder joints will pull apart the solder joints due to excessive thermal expansion and contraction, causing a dead light phenomenon.
In response to the above phenomenon, LED packaging manufacturers and LED lighting application manufacturers should formulate strict LED standard user manuals to prevent the occurrence of the above phenomena during the production process.
