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The only possible repairable cause for these lines is a failing T-con board - this is the LCD timing controller board and processes all video before it's sent to the panel. The only other possible culprit is the LED lit LCD panel itself, and this is not repairable as it would cost as much as the TV did when new to procure and replace the panel.
That being said, since there is no way to effectively test between the T-con and the panel, the next step is to replace the T-con board in the set and hope this is the root cause. There are no pushbutton fixes or adjustments for this, it directly indicates a fault in the LCD processing to the screen. If you are looking to repair this yourself, then the T-con board is at the link below for your set for $29:
Alternatively a shop will charge between $175-$200 parts and labor to swap the T-con and can be located at the link below:
Other than that, I'm sorry for the bad news here and wish there were a quick fix.
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