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Title: Mixed up grounds - Galaxian Midway Post by: lesoleil70 on December 27, 2014, 11:55:04 am http://www.arcade-museum.com/pinouts-game/7885.html (http://www.arcade-museum.com/pinouts-game/7885.html)
Hi - I've got a galxaian clone board that follows the pinouts of the midway in the above link. I'm getting a lot of interference on the screen. On one monitor RGB are ok, on another monitor they are also OK however the screen is scrolling, but both bleed white badly. I've followed the pinouts and it would appear the ground that is being run to the monitor is pin 21, and not video ground from "S", which seems odd to me Question is - is ground = ground and I should not care, or is this a clear case of a hack job and I should ensure video GND goes to the monitor, and the other GND be removed from the equation when running R,G,B,Sync and "Gnd" to the monitor. Has anyone ever seen this before - common hack ? If so, would a ground from elsewhere be the cause of these screen issues I'm having? |