Hello,

I currently own a full size arcade game "Mr. Do!" that contains a WG19K4675 CRT monitor. I am having a problem with the image -- it is repeated approximately four times on screen, but it is not isolated by red, green, or blue individual images. Instead it appears as if a fraction of the whole image is included in each of the four vertical sections. I have attached a picture of the screen showing the repeat problem.

Can anyone suggest whether this would be a convergence problem or more likely something else?

 

Almost looks like your vertical oscillator is running at the multiple or sub-multiple of the proper frequency. Does the display have a Vertical Hold control? If so, try adjusting it.