bad pacman monitor?

[unix4hire]

Hi, I finally got my pacman working by sending my board off to twobits for repair.  Now my excitement disappears after playing for about 10-20 minutes because the monitor/screen starts getting all intermittently jiggly and eventually turns into a solid vertical line in the center of the screen.  Is this what I fear it is?  A monitor going out?  Or something more benign?

[menace]

sounds like a cold solder joint somewhere in the horizontal section --get a real bright light, a magnifying glass and have a look around--you're looking for anything that has separated from the board or a solder joint with a hairline crack in it.

[MonitorGuru]

Nope, it's a vertical deflection collapse... remember a Pacman monitor is rotated 90 degrees from a TV set.

Besides cold solder joints, your yoke wire may have simply come unplugged from the board or from the yoke. Check the Yellow and Green connectors.

More dire, would be a short in the vertical winding on the yoke or part of the vertical circuit is dead.

[Ken Layton]

Sounds like you have a Wells-Gardner 4600 series monitor. Yes, it has numerous bad solder joints that cause the exact problem you have described.