What missing an element on the board ? Yes,

What missing an element on the board ?

Yes, on-board 3 coupler. One - the stabilization +5 SB, the second - the stabilization of the main power supply and a third that we need.
With the closure of the green wire to black, it opens and enters the voltage on the PWM.
But if a few seconds leaving no voltage in output, with the coupler off the voltage