Hi johnnyi6,

I'm Harvey the Master Plumber.

Your problem is: had a crackling noise then pop..looks like transformer has blown,replaced
but still no lights ..fan o.k...don't appear to be getting any power to transformer via switch?...how do you get push button switch out?...
bypassed light switch and lights o.k with new transformer..any ideas..

Yes, I agree, the switch went bad. It snaps in so you will break it during removal. I recomend you get the replacement switch first so you don't have a wire hanging out while you wait for the new one.

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Thank you,
Harvey your Master Plumber