Superior Aspects of 7 Series Models
The 7 series models come with Internet Suite of Yahoo widgets, and several other applications, but the 6 series models lack these widgets, though the top end 654 46" LCD unit does come with internet connectivity, and content sharing provision with special 'AllShare' feature.
6 series models come with Touch of Color, and upgraded style of panel, while the 7 series models feature Preloaded Content including goodies such as cooking recipes, children’s stories, games, DNLA functionality allowing you to enjoy PC games and other goodies on your television set.
There are minor changes in TOC design, giving slightly improved aesthetics on 7 series models in comparison to 6 series.
When you really want to enjoy surround sound effect, subwoofers are a must!
And, once again Samsung 7 series LCDs score over the 6 series in this regard, as they come with built-in subwoofers, but unfortunately, you'll have to buy an additional home theater unit to enjoy the same audio effect with 6 series models.
LED lighting is yet another cool feature available exclusively on the series 7 models, and the series 7 models are also capable of playing HD picture in picture, but series 6 models have only PiP playback for analog signals.
Video and Audio Playback
Even the series 6 units have Ethernet and USB ports, but only series 7 sets are capable of playing video from both, while series 6 units are limited to playing audio files, and opening pictures. They definitely lack the processing power of Samsung 7 series TVs.
In addition to all these things, the Samsung 7 series LCDs are lighter and sleeker, and they're 'Personal Video Recorder Ready' as well. For instance, 654 46" LCD TV weighs 18.1kg without stand, while the 750 46"LCD 3D TV weighs only17.6kgs.