Sadly because of the impact, the set is probably not repairable at a cost less than getting a replacement TV. Most likely the inner layer(s) of the screen have fractured, disrupting the signal coming through the mesh.
I agree with cybergrannie, call and ask: www.samsung.com/
Then you can make up your mind if you want to get it fixed or if it would be less expensive to get a new one.
We still have a few private TV repair shops in my town, so you can always hunt for one of those places and get a second opinion.
I am always of the mind to fix before replace and I cost it out. Based on the year (age of the TV) and how much a repair costs.
Like if it costs $100 and the TV is 1 year old, then I get it fixed, but if the TV is 5 years old and costs $100, I will invest the hundred in a newer model.
Post back with an update!
With todays technology, it is cheaper to replace than repair. Sorry.
Sorry but I believe you will have to replace it - unless you purchased an extended insurance policy that will cover this.
From what I've been able to find it appears the cheapest repair would be over $200 (service man to your house) and still cost a lot even if it is not fixable.
Why not contact Samsung and ask them about repairs. They can probably give you a better answer.