How the f*ck is this possible?!
Red is Q1 drain, yellow is R30 current sensing - all against GND.
There is a voltage ramp which means DAC + U10A + Q3 is working.
There is a switching - the voltage is pulled down with each Q1 impulse to its gate - this means Q1 is working.
But there is no current flowing through the transformer - am I right? There is no significant voltage drop across R30 (check the yellow voltage scale it is 200mV/div!). I cannot explain why there is some voltage drop at the end of the signal. I don’t get it.
The only explanation is the transformer is broken somewhere inside - I measured it twice.
Or the 0.5R resistor (R30) is dead short (thus no voltage drop) which it should not be - there are two 1R in parallel - brown -. black - black - silver - brown… 1R 1%.