My samsung 46 in has horizontal lines. It started to get a little bit off when it was first turned on and then quickly fade. Then in progressively would take more time to correct itself.

IF you unhook one of the ribbon connectors going to the panel boards do you get a normal picture on the other half?

This can be an issue with the Timing Control circuit board, but that is just an educated guess.

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

Samsung LN46B650 Thin Black Horizontal Lines - Forums - CNET

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CNETJun 11, 2015 - I'm experiencing thin black lines from the top of the screen to the bottom. ... my lcd tv has multiple lines are horizontal it starts from the right and fades too the left, ... Samsung LN55a950 - Horizontal lines on right side - Forums - CNET
Jun 11, 2015
Samsung 52" LCD TV black lines - Forums - CNET - CNET.com
Jun 10, 2015
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Hi my LG 47ln5700 tv set has thin greyish black horizontal lineson one side of the .... I hope this works good with Samsung LCD as well....

I have similar issues with my Samsung TV model LN55A950... all I did was take the back cover off...unplugged the two wide ribbon cables of the panel from the T-Con board, then turned it on...I waited for a minute until everything normalized. at first, all i see were similar lines...horizontal pin stripes on white background...white background because the panel is not connected to any image source. Then all lines are gone, after the 'normalization." you should only see white all through out. I then turned the unit off...connected the two cables back, turned it back on...voila! my TV is back to normal viewing, no more lines!!!

Change the Tcon board and you should be back in business.

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THIS SEEME LIKE A LOGIC BOARD OR LVDS CABLE COST ABOUT 300 DOLLARS

Visually, there is very little difference to the eye of the average consumer between 720p and 1080. However, 720p can deliver a slightly smoother-looking image, due to the fact that lines and pixels are displayed in a consecutive pattern, rather than in an alternate pattern.your tv is display format is 720p and blu ray is 1080p. what happen is it will be scaled into 720p. old tv set format is 480p 720p represents 1,280 pixels displayed across the screen horizontally and 720 pixels down the screen vertically. This arrangement yields 720 horizontal lines on the screen, which are, in turn, displayed progressively, or each line displayed following another. 1080p, on the other hand, represents 1,080 horizontal lines displayed sequentially. This means all lines are displayed during the same pass. 1080p is the highest quality HD display format. 480p represents 720 pixels displayed across the screen horizontally and 480 pixels down the screen vertically. This arrangement yields 480 horizontal lines on the screen, which are, in turn, displayed progressively, or each line displayed following another.

The set is under a year old and is under warranty. The LVDS cable inside these sets have a history of coming loose. The problem could be the panel. Either way, the set is the problem and needs to be looked at. This set is worked on in the home and does not need to be taken to a shop, so, you can still use it. Contact Samsung at: 1-800-SAMSUNG Hope this helps.