Does changing the screen resolution for the TV display in the display properties do nothing?
Right Click on desktop -> Screen Resolution
Chose the TV, change resolution
If that doesn't help, try the Advanced settings button on the same screen, choose the TV and set the refresh rate up/down a little. (Careful, don't push it up too much)
Yup! That'd work fine if the Intel Graphics utility would allow me to select anything other than 60Hz as the refresh rate.
OK, got an answer from th Sharp TV forum that enabled me to sort it!
Apparently there's a 'hidden' menu on the TV that allows you to select the display mode.