I have(well had the same problem). I had bought my TV from Best Buy in June 2011 right before 4th of July because I wanted to avoid the madness of an Independence day sale.
It first started with one horizontal black line that appeared after watching a movie. I tried a white wash on the TV, but that didn't remove the line. After a few days, another horizontal black line appeared on the screen. I started doing some research on this and found out that this happens with all Samsung Plasma TVs. After several more days, two more horizontal lines appeared on the screen. I got sick and tired of this and decided to call Best Buy Geek Squad. While talking to them, a "fifth" horizontal black line appeared on the screen. The first four lines are all next to each other in the middle of the screen, the last line is in the upper section of the TV.
You may not want to hear this and you may think this is a set up to buy the extended warranty, but it is not. I am actually glad that I bought an extended two year(which is really one year warranty, but we'll get into that later) warranty. Because of this, I was able to walk into Best Buy, tell them the problem after I got a confirmation from Geek Squad home visit, I was able to get a full credit for the original TV and exchange for a better TV(55" LED TV).
I know most ppl think that buying the extended warranty is a "rip-off", but in this case it's totally worth it. Yeah, you shell out an additional $100-200 bucks, but when you have a problem with your TV within the warranty time, you get back the original sale value in which you bought the TV and you could either exchange for another TV or upgrade(pay the difference) to a new TV.
I always buy extended warranties on TVs, Computers and Apple products. I have a history of products malfunctioning on me due to system upgrades, electrical shortages, etc. Plus, 1:4 TVs always have some problem once you take it out the box. You should have some insurance when you buy these products.
FYI....You mentioned that you bought this TV last year. All TVs have a one year warranty from Samsung. If your TV started showing horizontal lines before the warranty expires, you can exchange your TV for a new one with Samsung. Just look for the receipt. Otherwise, you will have to eat the cost and buy a new TV.
Don't buy another Samsung Plasma TV, they all have this problem. Stick with LCDs and LEDs.
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