Hello. I have an old arcade with an electrohome g07-cbo monitor. I modified the sync setting to negative to accept a raspberry pi with pi2jamma / pi2scart. The sync works but I can see the picture is distorted in the upper side (right side in the picture ) and has a negative cushion on the right (bottom in the picture). Also it seems a little rotated to the right. Do I need to recap this ? What can I check ? Thanks.