Museum of the Game® & International Arcade Museum® Forums

This problem has been present since I have owned the monitor and curious if anyone can give me some information.

I have three different chassis and the problem is displayed the same on all three.

There is a black blob that causes the image to bow away from it that is located on the right side of the monitor. This makes it impossible to move the image so that it touches the right side of the screen. When I turn the horizontal frequency up, I can see the black blob clearly.

Any clue or hint of things to try would be great.

See YouTube video:
https://youtu.be/aG7MQUrAloQ

Thanks!