Hi Microsim i do understand your point but given the price i paid to get a scope for my location, i prefer to let it run first to see if it survives long enough and then connect my scope to it. Since i know the issue is at 210Vac i will replace the mosfet and test it at 109Vac to check for any issues. Do you mean you want a picture of how the components are laid on the board? If yes i can take a picture and post it here
I think you will NEED isolation transformer to your oscilloscope, now or later
Or you cant connect it to your SMPS.
If you dont see whats going on, you are going to lose dozen of Mosfets on the fly.
Please show pictures of your setup, Can you tel me winding ratio you have used for transformer?
Thanks