When an LED sign, light box, strip system, or channel letter suddenly goes dark, many installers first check the LEDs themselves. But in most commercial lighting projects, the power supply should be inspected early. LEDs normally cannot stay lit if the power supply has no output. They need stable low-voltage power to keep working. If the power supply is out, disconnected, overloaded, or damaged, the LED modules may flicker, dim, turn on briefly, or stop working completely.
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2026-05-26