Screen flickering in classic arcade cabinets is a common issue that can detract from the gaming experience. Fortunately, several effective methods can prevent and resolve this problem. The most common approach is to first clean and reseat all internal connections. Over time, the ribbon cables connecting the PCB (printed circuit board) to the monitor can become loose or corroded, causing intermittent signals. Carefully unplugging and reconnecting these cables often restores a stable image.

For persistent flickering, the primary suspect is often the aging capacitors within the monitor's chassis, specifically the arcade CRT (Cathode Ray Tube). The flyback transformer and deflection board capacitors are particularly prone to failure. A cap kit—a complete set of replacement capacitors—is a standard solution. Replacing these worn-out components restores consistent power delivery and stabilizes the image. This task requires technical skill and knowledge of discharging a CRT safely to avoid high-voltage shock.

Another critical method involves adjusting the monitor's controls. Using the potentiometers (pots) located on the monitor chassis, a technician can fine-tune the voltage settings. Adjusting the B+ voltage (the main DC supply voltage) to the manufacturer's specification is crucial, as an incorrect value is a leading cause of flicker and rolling. The horizontal hold pot can also be adjusted to stabilize the picture.

Finally, ensuring a stable and clean power supply is fundamental. Voltage fluctuations from the wall outlet or a failing power supply unit (PSU) in the cabinet can directly cause screen flicker. Using a line conditioner or a multimeter to verify consistent voltage input can diagnose this issue. Replacing a failing PSU is a direct and effective fix. Regular maintenance, including cleaning and checking for cold solder joints on the monitor board, remains the best long-term prevention strategy.