Dvi out screen size

I've attached my macbook (leopard 10.5.5) to my Samsung LE26R73BD LCD TV via the mini-DVI to DVI adapter and DVI to HDMI cable.
I can see the desktop on the TV but the outer edges of the desktop are "off the screen". The preferences finds the monitor and notes it as Samsung and selects a default resolution. If I adjust the resolution it makes no difference the problem remains.
Clearly the macbook can identify the LCD TV and the Samsung is receiving and displaying the screen from the macbook.
I can find nothing in the Samsung's menus that resolves the issue. There is a zoom and alignment option but the amount of the edge that is "off screen" is too large to adjust with the TV options.
Has anyone experienced this type of issue. If I use the VGA adapter to connect it displays the screen correctly. Why the difference between the VGA and DVI? The LE26R73BD is older technology now, but it is HD ready. I am keen to use the DVI rather than the VGA to get better picture definition.

Welcome to Apple Discussions:
The DVI input is purely digital. The VGA is analog. With VGA, the settings for the TV set are automatic because there is a single standard for VGA.
With DVI there are many standards, may resolutions, scanrates, etc.
On my Sony Bravia, there are many menu settings for compatibility. The computer does its best to detect the best resolution etc on the monitor, but for older monitors, you may need to set the vertical/horizontal/refresh rates manually. If there are not an option, then there is not much to do.
You can play with the resolution setting on your Mac, that might work.
What resolutions does your Samsung display? Most Digital TVs today include the standard 480, of course, 720 and 1080.
If you TV erroneously detects a resolution, it will display improperly. Does your computer just detect a generic Samsung? Or does it actually list your model number?
It's not clear what "HD-ready" means. There are older HDMI standards and specs that may be the problem. The TV and computer "talk" to each other but if there is some error in the signals, then it won't work properly.

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