A loose wire or connection in your LED circuit can cause only part of the lights to illuminate. Another reason for this issue could be an insufficient power supply. Modern LED strips are engineered with redundancy, unlike old-fashioned series circuits. Each strip is composed of many tiny, independent electrical units wired in parallel to the main power line that runs the length of the strip. Here are the most frequent reasons: 1. Voltage Drop One of the most common causes for half of your LED strip not lighting. LED (Light Emitting Diode) modules are the fundamental display units of an LED screen system. They typically consist of LED chips, driver integrated circuits (ICs), printed circuit boards (PCBs), connectors, power supply, and signal lines. Each module is responsible for displaying a specific pixel. LED module failures typically manifest through three primary symptoms: A 2023 LED failure analysis found that 62% of persistent issues originate from broken solder joints or moisture ingress, while 28% stem from voltage irregularities in driver circuits. In this article, Simon Johnson, Country Manager at Theben Automation, shares two of the most common questions that the brand fields from installers, and what you can do to solve the most frustrating issues. LED lights require a certain voltage.