mau123sul,

The LN40B530 does have a composite input, and if you have a composite only input, then you should be good to go.

The difference between the 5 and 6 Series can vary, including resolutions, panel specifications and features. Since there are several sub-categories for each (B530, B540, B550, etc), you'd have to be more specific.

You can compare models on the Samsung.com website too.

--HDTech