Introduction to the Causes of Dead LEDs in the LED Chip Soldering Process

Release Date:

2020-12-18

　　 LED light bead Common soldering methods include soldering with a soldering iron, reflow soldering on a heating platform, and wave soldering. Improper soldering techniques can easily lead to dead LEDs. Below, we will specifically discuss the causes of LED chip failure resulting from these common soldering methods.

 

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　　1. Causes of Dead LEDs in Soldering with an Electric Soldering Iron

　　Soldering with a soldering iron is a common practice, particularly for building prototypes and performing repairs. To cut costs, most commercially available soldering irons on the market are of poor quality; many of them also have inadequate grounding, leading to leakage currents and suboptimal soldering performance. This effectively creates a ground loop between the leaking soldering tip and the earth, which can result in voltage levels tens or even hundreds of times higher being applied directly to the LED die—directly causing it to burn out. Note that electrostatic discharge (ESD) situations are even more severe: when a person’s body becomes charged with static electricity, the circuit’s resistance to ground decreases, allowing a much larger current to flow through the LED die. This is precisely what many people refer to as “static electricity.”

　　2. Causes of Dead LEDs in LED Lamp Bead Soldering on the Heating Platform

　　Dead LEDs caused by soldering LED chips on a heating platform. Because LED chips are produced in continuous strips, most companies can readily accommodate small-batch orders and sample requests. Thanks to its low equipment cost and simple design and operation, the heating platform has become a preferred production tool. However, factors such as unstable ambient conditions—e.g., temperature fluctuations due to fans—and insufficient operator proficiency in controlling the soldering speed of LED chips are major contributors to dead LEDs. Additionally, proper grounding of the heating platform is also critical.

　　3. Reflux LED light bead Causes of Welded Dead LEDs

　　LED chips are typically assembled using reflow soldering. This method is generally a reliable production process well-suited for mass manufacturing and processing. However, improper operation—such as incorrect temperature settings or inadequate equipment grounding—can lead to more serious issues, including dead LEDs.

 

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