The regional settings on the televisions are set for the region that they will be in. You may want to consider contacting Samsung Support in your area and seeing if there is something that a service call would be able to do. However, there are no guarantees when moving a television (or any electronic device) out of it's native region that it will work.
If the tuner and components are designed for 60Hz, and all that is availabe is 50Hz, your television might not be able to properly transfer to the new region either by absence of software or by the hardware itself. It MAY be possible, but I'd suggest that it likely isn't.
The number in Austalia is 1300-362-603.
I bought an LN52A650 while living in the UA. I have now moved to Australia with the TV. I am unable to connect any HD Digital Set Top boxes to the TV (either with Component or HDMI). The inbuilt TV Tuner does not seem to pick up the Australia TV signals which is why I went for the Digital Set Top box rout. I get "Mode Not Supported" when the Digital Set Top box is connected. An XBOX, Media Box, and PC all work with the TV (signal is 60hz). The Set Top Box works with another US LCD we have.
Is there a way to configure one of the LN52A650 input ports (HDMI or Component) to accept 50hz?
Is there something else I can do to receive TV singals on the LN52A650?