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Is the line down the centre of the screen, and visable from top to bottom?
Yes please give me a minute just looking up costs of repair.
I am afraid this is a hardware fault (not software), it suggests a connector on the screen has come lose and preventing it from controlling that row of LEDs.
The screens use very small connections so I dont believe the screen can be repaired which leaves replacing the screen, as its not the glass (which is a £10 part), but the actual screen which sits behind at fault.
Typical cost of a new screen is around £100 from looking at ebay here.
If your still in touch with the seller I would look to get a refund, if this isnt an option give a minute and I will see if I can locate some online firms who can replace the screen, as you will find most local phone shops will charge a significant overhead.
No problem, I would start by giving Samsung a call on 0330(###) ###-####/a> in the morning, as see if they will do this under warranty, as assuming there is not crack or obvious damage to the glass they may be willing to help you out.
Do let me know if you need anything further.
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