Notice on my two new Jetson Nano B01 4Gb development kits that pin4 (PWM) of the fan header J15 appears to be missing any form of pull down resistor and this results in a PWM fan running full speed when the Jetson Nano is powered down / off.
The fix appears to be a 3.3K resistor from pin4 to ground. This does not seem to impact the PWM management capability of the development kits. But I am interest to know if this is a known issue. Thanks