|There are several ways to correct this, depending on the actual problem.|
First adjust the output H/V shift value in the Output parameters menu until the white border that is displayed is centered on the output display.
Next adjust the TL pos. adj. values in the Setup Program source menu until the incoming video signal is displayed correctly in the white-bordered box. You may also need to adjust the BR size adj. setting to insure the incoming video signal is properly displayed.