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I'm guessing the flyback could be bad. If one of the pots in the flyback is cracked, you may find that both pots affect the focus, and neither adjust the G2. Also, it could be a bad connection between the fly and the PC board. (ground lead not grounded?)
Also, the G2 might be controlled by a service menu item. I had a monitor like that once. No G2 pot. I never did figure out the menu, so I rewired it to bump the G2 up a little. That's probably not the best idea, though.
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