When using LED lights, the most afraid thing is that the LED lights are not on. At this time, don’t blame the environment. Incorrect installation methods, protective measures and too high power supply are important reasons for the lights not on. Of course, many times it is also human factors. This paper analyzes how to deal with LED packaging failure with 8 examples?

Do not blame the environment if the dead light is not on. Incorrect installation methods, protective measures and too high power supply are important reasons for the light not on.

1) Poor heat dissipation of LED leads to aging, delamination and chip falling off of solid crystal adhesive

Precautions: prevent the LED from floating and tilting during welding. Do a good job in LED heat dissipation to ensure that the heat dissipation channel of LED is smooth.

2) The over-current and over-voltage impact causes the drive, the chip burns out, and the lamp is in an open circuit or short circuit state

Preventive measures: do a good job in EOS protection to prevent the current and voltage from being greater than the current and voltage impact of the lamp or driving the LED for a long time.

3) Overcurrent impact, burning the gold wire

Preventive measures: prevent overcurrent and overvoltage from impacting the LED.

4) The use process did not do a good job in anti-static protection, resulting in the breakdown of LED PN junction.

Preventive measures: do a good job in ESD protection to prevent the operation of lamps caused by electrostatic interference.

5) If the welding temperature is too high, the colloid expands violently and breaks the gold wire, or the packaging colloid is impacted by external force to break the gold wire.

Preventive measures: each lamp has corresponding installation instructions. Weld according to the recommended welding conditions. Pay attention to protect the packaging structure from damage during assembly.

6) The LED is damp but not dehumidified, the glue cracks and the gold wire is broken during reflow soldering.

Preventive measures: be careful in the maintenance process. Dehumidify according to the conditions. You can use moisture-proof oven or oven for drying and dehumidification. Reflow soldering shall be performed according to the recommended reflow parameters.

7) The setting of reflow temperature curve is unreasonable, resulting in the sharp expansion of colloid in the reflow process, resulting in the breaking of gold wire.

Precautions: reflow according to the recommended reflow parameters.

8) Zener is broken down, the positive and negative electrodes of LED are short circuited or PCB board is short circuited during assembly, and LED is broken down.

Preventive measures: do a good job in ESD anti-static protection to avoid positive and negative short circuit, and carefully check PCB.

be careful! The problems that often occur are human factors. Carefully follow the installation methods and protection methods of lamps to avoid unnecessary problems.