Three dead dimmers with different loads

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Now I have three dead dimmers

I have three different loads

1. MeanWell PCD-30 powers supply (for 12v LED stripe) with dimming

2. Two MeanWell RS-50-12 power supplys in parallel for 12v LED without dimming

3. Noname 45VA 12v power supply for 12v LED without dimming

I _had_ three dimmers.

Two wires connection. On free air. Not yet in the wallbox.

So. One dead at all (the 2nd load)

Two - are hot enough not to switch off the load or blink in 10-15 minutes.

All three dimmers making noticable noise by it's ferrite cores.

All loads are dummied by Fibaro's ballasts.

I've open the "completely dead" dimmer and found that winds on the core isn't filled with compound completely. It is the source of the noise.

The questions:

1. Why?

2. What to do?

3. D4NK60 - the right MOSFET there?

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