Also, while fiddling around in live monitors, you should only use a non-conductive screwdriver, like one completely out of plastic to avoid damaging yourself and the monitor by accident.
Yes. Actually, I think you have to use a plastic screwdriver, anyhow, as metal would introduce a distortion to the picture you are trying to tune.
But certainly, monitors are the most dangerous computer component to service. And any operation that requires the monitor to be on while you have it open is even more dangerous, yet.
You need to know what you're doing, have the right tools, and be quite cautious, and be aware any time you are working with one, you are taking a risk. (Said the man who can show you a fairly large scorch mark on a C=1950 chassis caused by a high voltage capacitor he THOUGHT was discharged. Thank god I was smart enough to have that chassis well grounded, so the spark hit that instead of jumping to me...)