[SOLVED] MS8-26SU Thin Lines Moving on Screen

[kirb]

Hello.

I’m slowly working on repairing a Virtua Cop 2 and the monitor needs some attention. It has these thin lines at a slight angle that move across the screen. These are different from refresh lines as they’re visible with the eye. I’m suspecting a grounding issue or possibly a monitor pot setting needing to be adjusted. I believe these lines might be causing tracking issues with the light guns. Any thoughts on how to fix this?

View: https://youtube.com/shorts/ht6s8GaZNmg?feature=share

 

[advans14]

Could be lots of things. You could try unplugging the speakers. Check grounds. If the monitor is old i would recommend a cap kit.

 

[kikaso]

Could be a ground loop issue. I was having a similar problem with my NAOMI. I replaced the (not original) power harness and added some ferrite cores which helped but didn’t get rid of the video interference entirely.

Monitor Ground Loop Interference

 

[kirb]

Came across this thread which described a similar issue. Just had to bridge earth ground and regular ground on the PSU. Seems to be a common issue in Suzo Happ PSUs. Monitor looks good, still didn’t solve the light gun issue though

https://www.arcade-projects.com/thr...darksoft-cps2-has-3-2-and-suzo-happ-psu.7870/