Smoothieware on SKR 1.4 : PWM won't work

I had a spare BTT SKR 1.4 on the shelf , so i tried to flash it with smoothie and a config file i received.

The motors work without problem but the only thing now is to PWM the signal.

I used FAN pin 2.3 for the signal.

When i Fire in lightburn i see the LED fade in or out , so i’m sure the PWM works

When i attach my Laser module ( KKmoon BX20 ) the laser diode don’t work.
The module has 3 pin connector ( PWM - GND - VCC ) or a 2 pin connector ( dont know the pinout)
Also the module has a little button to switch from PWM to TTL

Someone idea how to connect correctly ??

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