Switching PSU advice
There's a daughter card, who rectifies the main AC: the voltage across the two
big caps is correct.
Across source and drain of the TOP200YAI - Three-terminal Off-line PWM Switch
there is the rectified voltage. The control input is 0.
On the control line of the opto is not 0, but 0.34V.
It seems that the PSU lacks the "start signal".
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