Maybe I should say it differently. It's a separate winding from the primary, usually called 'auxiliary winding' and shares the primary GND.It's a "secondary" sharing the same GND...
I replaced IC3 and Q16 and I still don't get any output on gate pin of IC3.
I am constantly getting voltage on VDD pin (17V - 10V peak to peak) in 1s intervals.
But I am doing measurements with AC disconnected, because my oscilloscope is grounded....
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