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I think these posts are confusing. First these comments are meant for the GH2.
First you need to be specific if the prime lens you have mounted is a lens with AF (e.g., Panasonic native lens). Then you need to turn the switch by little dial on top-left to MF (some lenses don't even need this changed), and the focus assist happens without pushing the little wheel in the back. Simply turn the lens focus wheel and the LCD/View finder will magnify automatically. However if the switch is set on AFS, instead of AFC, press the shutter button half way, and then turning the focus on the lens jumps to focus assist. I'd bet there are menu settings that change this behavior as well.
If the lens you are mounting is a legacy one without any communications with the camera, then turn the switch by little wheel on top-left to MF. Now pushing the wheel in the back magnifies the LCD/View finder for focus assist... Al