I am in process trying to fix xbox one S with partial power issue (power on and then off). One thing that I noticed is that cooling fan doesn’t seem to do a quarter turn when power is applied. Should cooling fan get full 12V during standby and is only controlled by PWM? I checked the voltage and don’t seem to get 12V power to the fan, although all standby voltages on board seem to be fine. And does one S power on with fan disconnected or it should immediately shut off?
Thanks for any help.