How to identify the Welding problems of LED lighting

　　Heat the not working LED lights to 200-300 ℃, move away the lighters, take 3 -volt button cell battery by using positive and negative connections LED, if the LED lights can be lit , but with lower temperatures lead LED lights are not lit by the light changed , which proves LED lights are Weld. Reason can be lit using the principles of heat expansion and contraction of the metal , LED lamps with internal lead expansion joints stretch turn , then turn on the power when heated , LED will be able to normal light , as the temperature drops LED lead shrink back to normal condition , disconnect the internal solder joints , LED lights do not light up on the point , really try this approach are efficacious .

　　Weld the two wires of LED lights on a metal strip , with thick sulfuric acid soaking , the LED lights outside colloidal dissolved , colloidal and dissolved all out to observe the situation welded joints under a magnifying glass or microscope , you can find out a soldering or welding the two issues are gold wire bonder that parameter settings wrong, or other reasons, in order to improve methods and techniques to prevent weld phenomenon happen again.

　　During using LED products, sometimes you could meet with dead lights , there are two reasons, the open light of death is not good welding quality , or quality problems plated bracket , LED chip leakage current increases will cause LED lights does not shine . Now many LED products in order to reduce costs did not increase antistatic protection, so prone to be damaged by static electricity sensor chip phenomenon. Rainy thunder prone to high-voltage electrostatic induction power lines and power lines superimposed spikes will make LED lighting products suffered varying degrees of damage.

　　In short dead lights occur for many reasons , can not list them all, from the package , application, to use all aspects of the phenomenon of dead lights are likely to occur , how to improve the quality of LED products is the packaging companies and enterprises should attach great importance to the application and careful study the problem , from the chip , frame selection, to the LED package the whole process should be conducted in accordance with ISO2000 quality system to operate . Only in this way it may LED product quality improvement overall , in order to achieve long life and high reliability . In the application of circuit design , select PPTC element varistors and perfect protection circuit , an increase in parallel ones , using constant current switching power supply, additional temperature protection is to improve the reliability of LED products effective measures . As long as the package , the application of business in strict accordance with the ISO2000 quality system to operate , it must make the LED product quality to a new level .