Archive for April 22nd, 2019

Fluorescent Ballast Caps: FAIL

After converting another fluorescent shoplight into an LED fixture, I tested its capacitors:

Fluorescent ballast capacitors - one failed
Fluorescent ballast capacitors – one failed

The ESR02 reports one as a 4.8 µF capacitor, the other as a “defective part” with a 4 kΩ resistance. Having a cap fail by turning into a resistor is surprising; I’m more surprised it didn’t simply burn up.

They’re visually indistinguishable, of course.

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