Reading http://www.samsung.com/hk_en/consumer/tv-av/televisions/lcd-tv/LA40A550P1FXZK/index.idx?pagetype=prd_detail&tab=specification I see a LCD of 1920x1080 so any extra pixels would go where?
Be sure to check the manual if it supports higher input ranges but don't expect a better picture.
Bob
I have a Samsung LCD 550 1080p TV that I want to use as a monitor.
Is there a way to increase the resolution above 1920x1080. I have ev3a GTS450 video board that supports to 2560.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic