Can't recognize any lines, but if you think that there is a problem you should make use of your warranty and get that thing fixed. Can you see the lines in all circumstances, like e.g. playing games, white background, black background etc. ?
~4.1.2 Stock root...4.3 or not 4.3??That's the question
Kindle Fire HDX 7
~Awaiting Play store and some decent tweaks/roms
~ MiniCM 2.3.7 Unlocked BL nAa Kernel
~ICS Root, Unlocked BL, Things to come?
(hate that thing!!