How to get static instead of black screen?

How to get static instead of black screen?

The TV in question is a Sony Trinitron KV-14M1D CRT. I know it sounds backwards but I need the screen to show white noise for a project (oscillograph); but there seems to be a static block that displays a black screen when static is present. Do you think there could be a workaround by plugging something into the antenna input to trick the TV or something like that? I don’t have the schematics unfortunately.

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