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TIDM-02013: There is no driving waveform on the circuit mainboard.

Part Number: TIDM-02013

When the control card is not inserted into the tdim-02013, the GPIO port can detect the output PWM waveform. When the control card is inserted, the voltage across C164 is measured, but no voltage PWM signal can be detected. What is the reason? Is there interference? Or are there other reasons?