Arcade machine monitor flicker is a common issue that can disrupt gameplay and damage equipment. The most effective prevention methods start with proper voltage regulation. Use a multimeter to verify stable power supply to the monitor, as voltage fluctuations are primary culprits. For CRT monitors, which most classic arcades use, regular degaussing is essential to eliminate magnetic field interference causing color flicker.

Check and replace aging capacitors in the monitor's deflection circuit and power supply section. Capacitors degrade over time, causing visible screen flicker. Ensure all internal connections, particularly the neck board and video input cables, are secure and corrosion-free. Implement adequate ventilation around the monitor to prevent overheating, which exacerbates flicker issues.

For persistent problems, adjust the refresh rate potentiometer if available, or consider installing a voltage stabilizer. Regular maintenance including cleaning dust accumulation and inspecting for swollen components will significantly reduce flicker occurrences. Professional recalibration every few years maintains optimal performance, especially for valuable vintage arcade machines.