Hello guys, greetings from germany!

Got a question concerning pwm controlled gpu fan on an Asus Zenbook UX533F. After removing coolers and unplugging fans for repaste, gpu fan is faulty. No or faulty pwm signal I assume, cause with plugged pwm pin on connector, fan is not running, with unplugged pwm pin, fan runs full throttle. The gpu fan itself seems to work correctly as I tried cpu and gpu fan vice versa on both fan forts. 

Any ideas how to approach onto this problem?

Thanks in advance,

Gonzberg