I expect that the issue is that your Raspberry Pi is using different resolution to your TV.
The resolution can be changed manually by editing the Raspberry Pi
config file which is located at
You must enter an
hdmi_mode in that file in order to set the resolution. The values that correspond to the resolution you want can be found half way down this wiki page.
Would give you a resolution of
Electronic Industries Alliance (EIA-861B) refers to a CEA/EIA standard
which consists of display timing and formats supported by Digital
Display Monitor Timings (DMT) are a list of VESA standard pre-defined
timings which are commonly used within the Computer industry.
This leads me to believe that CEA (
hdmi_group=1) should be used for televisions. Whereas DMT (
hdmi_group=2) should be for computer monitors.