Why Your Mini Split Fan Fails: A Deep Dive into PWM & FG Feedback

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In this member-area video, we take a detailed look at a Mini Split DC Fan Drive Schematic and explain how the complete fan control circuit works.

You will learn how the PWM signal controls the indoor DC fan motor and how the FG feedback signal is generated by the fan and returned to the microcontroller. I explain the complete circuit step by step using a detailed schematic.

The video covers the 15V and 5V power supplies, voltage regulator, optocoupler, transistor switching, pull-up and pull-down resistors, potential divider, PWM signal generation, FG feedback, and microcontroller control.

We also calculate the PWM voltage using the potential-divider circuit and explain how the feedback pulses allow the microcontroller to monitor the fan motor operation and speed.

This schematic analysis is useful for AC technicians, HVAC technicians, PCB repair technicians, and anyone working with inverter AC indoor unit PCBs and DC fan motor circuits.

The complete fan motor repair video is available publicly, while this member-area lesson focuses on the schematic, circuit operation, PWM control, and FG feedback system behind the motor.

Join the member area for more detailed AC PCB schematics, circuit analysis, component values, voltage measurements, and practical repair knowledge.
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