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The failure reasons of the LED full-color LED display

2014.09.09

 For the LED failure problem. Application design, first need to choose the appropriate circuit, reduce electrostatic threat from interface circuit, put an end to happen the working state of the damage of large current pulse LED, sealed LED to design the reasonable structure protection, prevent LED tube the injury may force phenomenon.

 
Secondly pay attention to rational use in the production of LED control: the details of the notice of material feeding use reasonable control, outstanding for material must do moistureproof processing; Pay attention to the strict control of anti-static measures display assembly plant should have a good anti-static measures, special anti-static, anti-static floor, antistatic soldering pen, static radio pad, anti-static, anti-static clothing, humidity control, equipment grounding (especially cut foot machine) is the basic requirement, and to use static all tested periodically; Must strictly control the wave crest welding temperature and furnace time. Recommended for: preheat temperature 100 ℃ + / - 5 ℃, the highest do not exceed 120 ℃, and the requirement of preheating temperature increasing is smooth, the welding temperature is 245 ℃ + 5 ℃, welding time suggest no more than 3 seconds, after furnace vibration or shock LED of avoid by all means, until the normal temperature state.
 
Crest welder regularly test the temperature of the parameters, which is determined by the characteristics of leds, overheat or fluctuations in temperature will directly damage the LED or LED quality hidden trouble, especially for small sizes such as 3 mm round and oval LED; Full color LED display when the LED is not bright, often more than 50% probability for the various types of virtual welding, such as LED tube feet virtual welding, IC pin virtual welding, welding and row needle row, etc. The improvement of these issues need to improve process strictly and strengthen the quality inspection to solve. Before delivery of the high temperature and room temperature ageing test, vibration test also can yet be regarded as a kind of good test method.


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