CFL autopsy.

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The CFL in the kitchen is left on 24/7 - sometimes they last a very long  
time, this one not so much.

At first glance it looked as if the windings insulation on the feedback  
toroid had incinerated, on closer examination; a capacitor next to it had  
self destructed and sprayed its surroundings with ash.

The capacitor was on the negative end of the capacitive supply splitter in  
the half-bridge.

All the semiconductors tested OK, but the 2 transistors were heat  
discoloured.

The 4.7uF/400V electro read about half the rated capacitance and more than  
the 40 Ohm that the Atlas ESR70+ is calibrated to.

The mains in RFI filter inductor had sacrificed itself to save the fusible  
resistor.

The CFL was a Philips 18W.  


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