46" Samsung LCD problem!

My 46" Samsung LCD, (model #LNT4661F, bought on May 10, 2008) has 2-3 horizontal lines across the screen on startup.  Once it heats a little, usually 20-30 seconds, the lines go away.  As long as the TV stays on, the lines do not return.  Any ideas on what the problem could be?  I'm afraid that the problem could worsen, and the lines could become permanent.  Is there a possible 'quick fix'?  Any suggestions?  Thanks!  JBurch 

I have a 40 inch lcd samsung and I have the same problem, I have the extended warranty and it sounds like it is the panel, please note that I have had my panel replaced 3 times and now finally I  get a new tv or my $ back so I can purchase a new tv. Since the 4th panel they came to install was defective and didn't even work!
Try tweeking the panel just a little after you turn on the tv, thats what the Tv repair guy did for us 4 times and it is still not fixed.
Best Buy has been dragging their feet with this issue, I purchased the Tv in Dec. 18, 2009, I first reported the problem 1/4/2010, then it took 31/2 months to get the first repair approved, within a day the panel went out again, same problem, called again, next panel install, end of  March, then called again in april for another panel, next panel May 24, it was defective, didn't even work!
DON"T Buy Samsung, the longevity seems to only last one year.
Also since I will be getting a repalcement TV, apparently i will need to purchase a new Ext. warranty. This is just crazy, It has taken me 6 months to fix the one problem and it is so frustrating. Best Buys ext warranty isn't all what it is cracked up to be. They move very slow and it takes them a long time to solve a problem, also they don't offer "Loaner Tv's" that's a joke too!

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