Read a few from http://duckduckgo.com/?q=LN46C670+jumper+cut and this issue is usually resolved after you kick it up a notch. Hope my little nudge helps you find out if your model had this issue and then use this next link!
My Samsung 46" LCD TV (model LN46C670M1F) started flickering a few months ago on an infrequent basis, now all it does is flicker. I did some research on my own with regard to this problem in addition to calling customer support. Customer service had me perform a few tests and determined there was an issue inside of the TV (I believe one of the boards) and it needed to be serviced at my cost since it is about 2 years old. I argued that TV has gotten infrequent use and to break down in 2 years from no fault of my own was unacceptable, particularly since this is a problem that has been experienced by many others. He could not help so I was transfered to his manager. His manager (head of customer service) said they could get me the phone number of a TV repair shop near me so I could call and get it fixed at my cost (Thanks!). I asked if she had heard about this problem happening in the past she said no. No? Google Samsung flickering TVs and see what comes up. There are thousands of posts of people with this issue and a class action law suit which pertained to some older models flickering (2008ish). The head of customer service was either lying or does not know of a problem that is effecting so many customers; i'm not sure which is worse. I have to go with the former though because I called the repair shop that they recommended and I asked if they have heard of this issue before; they did know and said it happens all the time!
I'm done ranting but this is one person who has bought 5 or 6 Samsung TVs in his life, currently owns 2, and will never buy one again. Who cares how good the picture is if it breaks after two years and the company will not take any accountability for the issue.