Aiming at the problem of LED failure. First of all, starting from the application design, it is necessary to select an appropriate circuit to reduce the threat of static electricity from the circuit interface, to prevent the high current pulse from damaging the working state of the LED, and to design a reasonable structure to protect the sealed LED, and to prevent the phenomenon of external force straining the LED tube leg. .
Secondly, pay attention to the detailed control of the reasonable use of LEDs in production: pay attention to the reasonable control of the use of materials, and the expired materials must be treated with moisture-proof processing; pay attention to the strict control of anti-static measures, and the display assembly factory should have a good anti-static Measures, special anti-static ground, anti-static floor, anti-static soldering iron, anti-static table mat, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially cutting machine), etc. are all basic requirements, and an electrostatic meter should be used Regular inspection; the temperature and time of the wave front welding must be strictly controlled. The suggestion is: the preheating temperature is 100℃±5℃, the highest is not more than 120℃, and the preheating temperature must rise smoothly, the welding temperature is 245℃±5℃, the welding time is recommended not to exceed 3 seconds, and avoid vibration or shock after the furnace LED until the normal temperature state is restored.
The temperature parameters of the wave soldering machine should be checked regularly, which is determined by the characteristics of the LED. Overheating or fluctuating temperature will directly damage the LED or cause hidden dangers to the LED quality, especially for small size such as 3mm round and oval LEDs; full color When the LED display does not light up, there is often more than 50% probability that it is caused by various types of virtual soldering, such as LED pin soldering, IC pin soldering, pin header soldering, etc. The improvement of these problems requires strict improvement of the process and strengthened quality inspection to solve. The high temperature and normal temperature aging test and vibration test before leaving the factory are also a good inspection method.
Effective control of the failure of LED products is an important part of prevention and control in packaging, display design, production and display engineering. The effective protection of these links requires our industry to nurture more outstanding companies such as Baishi, Nationstar, Lehman, Leyard, etc., and implement a more stringent quality management system, from design, procurement, production, quality testing, The whole process of packaging, transportation, pre-sales and after-sales tracking is carried out to monitor the product quality to ensure that the product has "zero defect in quality and service" and promote the healthy and orderly growth of the entire industry.
