Screen flicker in arcade game machines can ruin the gaming experience and even cause eye strain. To prevent this issue, several effective methods are commonly used.

1. CRT Monitor Maintenance: Regularly check and adjust the horizontal and vertical sync settings on CRT monitors, as misalignment can cause flickering. Cleaning the monitor's internal components and ensuring proper grounding also helps.

2. Stable Video Signal: Use high-quality video cables and connectors to minimize signal interference. Ensure the video output from the game PCB (printed circuit board) is stable and matches the monitor's native resolution.

3. Proper Power Supply: Voltage fluctuations can lead to screen flicker. Use a reliable power supply unit (PSU) and consider adding a voltage regulator to maintain consistent power delivery.

4. Capacitor Replacement: Over time, capacitors in the monitor or power supply can degrade, causing flickering. Replacing old or faulty capacitors often resolves the issue.

5. Refresh Rate Adjustment: Ensure the game's refresh rate matches the monitor's specifications. Mismatched refresh rates can cause flickering or instability.

By following these methods, arcade machine owners can maintain a stable and flicker-free display for an optimal gaming experience.