Technology
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It would be close to infinite refresh rate as the electron beams wouldn't need to move. Also, the phosphors in that spot would probably burn away in a few minutes resulting in no refresh rate at all.
But for a glorious few moments you'd be in nerdvana. Worth it. Refresh rate will simply be calculated by how many electrons hit the screen per second, so not quite infinite. Bet the number is pretty high, though.
Reducing the resolution doesn’t make the beam move any less, even at 1px it would still scan and hit all the phosphors on the screen. My Viewsonic uses the entire screen regardless of resolution; if you set it to 1x1 the entire screen would be lit up. It’s not an LCD, there is no native resolution.
When you powered an old CRT down, the image would collapse to a single horizontal line, and then to a point.
I was thinking you could just cut the power to the deflecting coils.