The possibility of reverse power generation from the notebook fan and burning the motherboard is extremely low.
Principle:
The working principle of a generator is to use the relative motion between a magnetic field and a conductor to generate electric current. The blades of a laptop fan generate a magnetic field when they rotate, but because the blades are thin and rotate at low speeds, the magnetic field generated is very weak.
Reverse power generation:
When the fan rotates in the opposite direction, the direction of the magnetic field also reverses. If the fan speed is high enough, the reverse magnetic field may induce a weak current in the fan coil. However, laptop fan speeds are typically well below the critical speed required to generate electricity.
Burn the motherboard:
Even if the fan generates current in reverse, the intensity of the current is very weak and not enough to cause damage to the motherboard. The capacitors and inductors on the motherboard have strong voltage resistance and can withstand voltages much higher than those generated by the fan's reverse power generation.
Blow the fan with a hair dryer:
Using a hair dryer to blow the notebook fan that is not powered will not burn the motherboard. The wind pressure and wind speed generated by the hair dryer are much lower than the reverse power generation critical value of the laptop fan.
Conclusion:
In summary, the possibility of the notebook fan generating electricity in reverse and burning the motherboard is extremely low. Even if the fan generates electricity in reverse direction and generates a weak current, it will not cause damage to the motherboard. Therefore, using a strong air pressure cooling base will not cause harm to the notebook.