After the hurricane and power outage I had a defective radio, computer and desk lamp, all plugged into the same outlet. Nothing else electrical in the house was damaged. The lamp is fluorescent FML-27W-6500k it has 4 pins.
The fixture has an electronic ballast. The ballast looks clean, nothing odd except a unidentified minor smell. Bringing my scope probe close I can tell it is oscillating. Although it looks like a thin pulse at 1,458 Hz, (that doesn't seem right). I have no idea what the output should look like. There are 4 pins and the driver has 4 wires out to the bulb, all from different connections. I want to know how to separate a defective bulb from a defective driver without buying a new bulb. Mikek