1) The LED heat dissipation is not good, the solid crystal glue is aging, the layer is off, and the chip is off. Precautionary measures: Do a good job of LED heat dissipation to ensure smooth cooling channel of LED (to prevent LED suspension and tilt during soldering) Precautions: Do EOS protection against overcurrent and overvoltage surges or drive LEDs for long periods of time. 3) Overcurrent shock, gold wire burnout 4) During use, ESD anti-static protection is not done, resulting in breakdown of LED PN junction. Precautions: Prevent overcurrent and overvoltage from striking the LED. 4) The anti-static protection is not used during the process, which causes the LED PN junction to be broken down. Preventive measures: do ESD protection work well 5) If the welding temperature is too high, the colloidal expansion will severely break the gold wire or the external force will impact the package colloid and tear the gold wire. Precautions: Use in accordance with the recommended soldering conditions. Take care to protect the package structure from damage during assembly. 6) The LED is damp and not dehumidified. During the reflow process, the glue is cracked and the gold wire is broken. Precautions: Dehumidify according to the conditions, dry or dehumidify with moisture-proof box or oven. Reflow soldering should be performed in accordance with the recommended reflow parameters. Precautions: Reflow soldering according to recommended reflow parameters. Precautionary measures: Do a good job of ESD anti-static protection to avoid short circuit between positive and negative electrodes. PCB should be carefully checked.
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2) Overcurrent and overvoltage surge, drive, chip burnout (open or short)
7) The reflow soldering temperature curve setting is unreasonable, causing the colloid to expand rapidly during the reflow process, causing the gold wire to break.
8) Zener is broken down. When assembling, the LED is shorted or shorted, and the LED is broken.
Typical case analysis and preventive measures for LED package failure
Dead lights, no light is a catastrophic failure. Listed below are common failure cases and preventive measures for your reference.