[comp.sys.mac.hardware] Old Mac with screen problems

gjohn@Neon.Stanford.EDU (George H. John) (10/11/90)

I have an old 512KE that's now functionally a mac+.  
Problem: The screen undulates.  If you watch the left border of the
screen, you can see tiny waves going down the border about one every
three seconds.  I remember hearing something about analog board
problems and so forth.  Recently the screen has been flickering now
and then as well.  

Is there a book / technical article somewhere about this,
or could someone give me some advice?

Thanks,
George John