I have an AD that has a problem with the X output. The screen just has a vertical line in the right hand portion of the monitor. I put an asteroids board in and have a good full screen image so I know it's a board issue. Measuring the X and Y outputs I get the following readings:
X= -9.75V and Y 1.9-2.3V. What could cause the X output to have a reading of -9.75?
X= -9.75V and Y 1.9-2.3V. What could cause the X output to have a reading of -9.75?

