Ok, gave that a shot, same, zero zip, nada, no display or visuals what-so-ever (for CH-1).First, turn screen illumination as far down as it will go (you want it "OFF").
Second, turn the focus to the worst it can get.
With channel 1 set to sweep, look for an electron "glow" at the top and bottom of the screen. If you can see a "glow" then Mr. Chips is probably correct in that the vertical amp is shot (this is the most suspect part anyway). Also check the channel 1 vertical position pot, as someone suggested. A bad pot could also manifest these symptoms.
-AA