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Sounds like T'Con board fault. For some models of Samsung LCD TVs, this part is built in the panel, means non-replaceable. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
Screen-shots to defective LCD are given. You can see and compare to that to your TVs', and can make sure about the fault to an extent. Line faults to LCD TVs too are given with illustrations.
This sounds like a heating problem..Either there is something keeping the heat inside the cabinet like stuff on top of the cooling vents (also on the sides and bottom) or there is dust inside. Blow the thing clean with clean, dry compressed air inside the cabinet.
Let me start at the beginning---Likely a bad main board in your case but nothing is sure in this type of set.
Main board controls all information to the front screen and communicates to various boards---There really is almost never a simple "that part is bad solution" as any board, the power supply, the main, etc can cause issues.
It can even be a issue with the front screen unit--called a display panel.
You might consider doing some research on the set by Google of the model number with "parts" to get an idea what is available and what potential parts cost might be.
If a main board is bad it will average from one to two hundred just for the part----if issue is the panel you are done--part if even available is more than set cost when new.