The internal material of the led lamp beads causes the lamp to die
1. The production process of packaging enterprises is incomplete, and the inspection methods of incoming materials are backward. The direct cause of LED dead lights is generally the LEDs packaged by the bracket row. The bracket row is made of copper or iron metal materials by precision mold stamping. The material is more expensive, and the cost is naturally high. Affected by the fierce competition in the market, in order to reduce manufacturing costs, most of the market uses cold-rolled low-carbon steel to stamp the LED bracket. The iron bracket row must be silver-plated. Two functions, one is to prevent oxidation and rust, and the other is to facilitate welding. The plating quality of the bracket row is very important, and it is related to the life of the LED. Because there is a period of time every year, the air humidity is high, it is easy to cause poorly electroplated metal parts to embroider, and make the LED components ineffective. Even the packaged LED will have weak adhesion due to the thin silver-plated layer, and the solder joints will be separated from the bracket, resulting in dead lights.
2. Every process in the packaging process must be carefully operated, and any negligence in any link is caused
The cause of the dead light lies in the dot and die bonding process. There is no way to use more or less silver glue (for single solder joint chips). If there is too much glue, it will return to the gold pad of the chip, causing a short circuit. The same is true for double solder joint chips, so the dispensing must be just right. In addition to the fixed time, the other three parameters are adjustable. The pressure adjustment should be moderate. If the pressure is too high, the chip will be crushed. If it is too small, it will be easy to solder. Welding temperature is generally adjusted at 280°C. Power adjustment refers to ultrasonic power adjustment. It is not good to be too large or too small, but moderate.
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