Screen flicker in older arcade machines can ruin the gaming experience, but there are several effective ways to address it. First, check the power supply—fluctuations or weak voltage can cause flickering. Ensure the power cord and connections are secure. Next, inspect the CRT monitor’s capacitors; aging or leaking capacitors often lead to flicker and should be replaced. Cleaning the monitor’s internal components, especially the flyback transformer and neck board, can also help. Adjusting the vertical and horizontal hold settings may stabilize the image. Finally, if the issue persists, consider recapping the entire monitor chassis for long-term reliability. Regular maintenance is key to keeping vintage arcade machines running smoothly.