I changed two controllers/transformers earlier for a friend. I was there to do six. I connected the first two and well, they blew up .
this post was submitted on 21 Jun 2025
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Nah mate. The transformer is usually used as an inductor for the switch mode conversion.
It looks like you have it right though. The big brown cap should be rated for 250v + and will be on the mains AC side.
The DC side will have lower voltage rated smoothing caps.
Post the link to the device or better photos and I'll have a closer look for you.
I'm seriously thinking that I got it backwards. I connected it according to the writing on the enclosure. But as TRK said, he has had them back to front due to the same thing. The guts can be placed into the enclosure either way and I reckon that's what's happened.
I left them at my friends house also.
@DiaDeLosMuertos @Dimand
The L and N are for Live and Neutral - the 240V end. The small black chip is a bridge rectifier with its big brown capacitor.