The bottom of the track lamp doesn't light up, but it can't be put down. Poor contact of power interface or open circuit of power supply. LED track lamp is a kind of track lamp with LED as light source, alias: LED track lamp. It is a kind of track light, which is widely used in shopping malls (clothing stores, furniture stores and other brand stores), auto shows, jewelry, star-rated hotels, brand clothing, high-end clubs, museum exhibition halls, chain shopping malls, brand business halls, professional windows, counters and other places in accent lighting. The power supply needs to be replaced in time when the light is not on.