Why can’t the flexible LED light strip light up after soldering?

When I tested the LEDs after soldering, I found they could not work. What are the possible reasons?

If you use low-temperature solder paste to solder a flexible LED PCB, after reflow soldering, the solder paste may come off and cause an open circuit. Low-temperature solder paste can become brittle after reflow. Yet flexible LED light strips are often bent during use, which can cause solder joints to fall off. So it is not suitable to use low-temperature solder paste to solder flexible LED PCBs. Make sure that the viscosity, wettability, and melting point of the solder paste match the product usage.

More reading: Analyzing The Cause of LED Dead Light From LED Light Package Technology

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