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This is most certainly a hardware fault on the TV.
Samsung TV's are good quality units, and based on the age would suggest it is worth getting it repaired.
From the symptoms you have it suggests the T-Con board has developed a fault, this is responsible for controlling the image on the screen itself.
Your best bet is to locate a local TV repair centre as they can often repair the TV's far cheaper than sending it to a big hub \ central repair centre, if you provide me with your postcode I can recommend a local repair firm.
Hi would highly recommend DS Budd on 01483 573955 or Teletech on 01483 799145, they have excellent feedback from customers who have been referred.
Yes do let me know what they say about the TV.