SAMSUNG PPM42M5SSX
If video wall mode option is set ‘ON’ this may happen. Make it ‘OFF” You can select this option at user menu screen itself. See the user manual for details. Settings to this mode might be different to models to models. Check whether [PIP] function is set to ‘ON’. If it is ‘ON’ make it ‘OFF’.
Details
Video Wall Natural Mode [New Feature to most of Plasma Displays]
Full : This option displays divided images on multiple monitors without missing parts as if only the viewable part of the separate monitors were simply part of a large single monitor.
Natural : This option displays divided images on multiple monitors as if the separate monitors were simply part of a large single monitor. Therefore there are missing parts on the edge of the monitors.
ADJUSTMENT MENU SCREEN