1) Inspecting the connection of video lines, it is suggested that the video transmission lines should be reorganized, and the standard 75 ohm coaxial cable should be used to transmit the video and make good grounding. 2) Confirmation of power supply, inadequate power supply or mismatch of power supply will interfere with video. 3) Ball machine failure will cause interference stripes in video, such as bad contact or bad contact of ball machine sliding ring. Suggestions for replacement, maintenance and treatment.