Tvzt-3010-03up Led //top\\

+5V --- [100Ω Resistor] ---|>|---- GND (TVZT-3010)

Use a multimeter in diode mode. A working LED will light up dimly (or show ~2.7V drop). A dead LED shows open-loop (OL). tvzt-3010-03up led

Tell me the model number of your light fixture and I can help you find a compatible part! +5V --- [100Ω Resistor] ---|>|---- GND (TVZT-3010) Use