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SCRN doesn't primarily adjust the brightness actually. It's kind of confusing unless you're already used to the way TV sets are designed, but it's backwards.
SCRN is the same as Brightness is the same as G2 on the CRT neck. It adjusts the Black point, not the Brightness (confusingly). You want to set that so that a black screen is totally black (with the user brightness set to the middle position). maybe a tiny bit grey, but JUST barely. NTSC black is actually 7.5, which is a very, very dark grey. I won't get into the details, but best practice is to wind in down until the screen is totally black, and then carefully turn it up until it's just riding the edge of black/grey.
You do not want to see the thin horizontal strips, that's bad. You need to back it down well past that until the screen goes black (and then up the tiniest bit).
The brightness of the image is actually controlled by the contrast control, also sometimes called "picture." It might be in a user menu accessed with the remote control on your set.
I'm beginning to think maybe the contrast/picture just got reset to the middle and it just needs to be adjusted.
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