Thank you for reply. I have check the voltage of the sync. It is around 0.07V. I also check the voltage of red, green, blue all of them is around 0.07V. How do I check horizontal and vertical sync hold?The sync voltage is 3V. When booting MiSTercade there's a few seconds before vertical sync is established (rolling vertical image), but I haven't seen shaking. Perhaps you can check your horizontal and vertical sync hold? I also really love the look of Sega Swing cabinets
