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C779
,A: Confirm whether the HDMI input device has a signal, (you can test whether it is displayed normally by connecting to the screen)
B. Confirm whether the resolution and frame rate of the HDMI input device are below the maximum input resolution and frame rate(720p50\720p60\1080i50\1080p25);
C: We recommend that you download the lastest official image of Raspberry pi if you still don't solve your questions. Download URL: https://www.raspberrypi.org/downloads/raspberry-pi-os/