Unfortunately, Netflix availability on Samsung televisions only happened on the 2010 models. There is no ability to load or use Netflix on a LNxxA650 model.
That said, the 2010 Blu-Ray models have Netflix capabilities. If you foresee a Blu-Ray player purchase in the near future, you might consider at Samsung player. Some models have the LinkStick included.
Is it possible to use a LinkStick with a Samsung 650A LCD TV to stream Netflix?