I’ve turned on my 128k and noticed that the screen is trebling. I get dizzy looking at the screen. I think it could happens by the fly back capacitor but not sure. None capacitor has been replaced.
I left the Macintosh on for a hour but the trembling remains. So I’m not sure it could be a Capacitors issue. The screen is trembling with the maximum brightness or with normal brightness. I doesn`t goes worst using the floppy disk.
I suppose it could be a bad ground. That would be easiest to check. Remove the case and locate the ground wire and bolt, and tighten it. See if that makes a difference.
I’ve took the Macintosh apart and left it at the floor because I need the table. Now I’ve took it again back to the table and now the screen is perfect!!