diagonal bars on Mac 512K screen

[bigmessowires]

I'm considering buying a Mac 512K system, and the seller sent me the image below. Any idea what would cause those wide diagonal bars?

 

[Byrd]

Could just be a bad photo - has the seller reported such an issue? If it is an actual fault, it could be something with the power supply more than the motherboard itself. That said, a good clean up of the internals might fix it.

JB

 

[mcdermd]

Looks like a normal digital photo of a CRT. The position of the scan lines at that moment are what cause that pattern in the photo. You don't actually see them in real life.

 

[bigmessowires]

OK, thanks! I'm used to seeing a horizontal line when photographing a CRT, not multiple diagonal ones. Maybe something about the relative speeds of the camera and horizontal scan rate...