What appened I have the same problem with my 46 in lcd.
I have a 50" samsung lcd tv. The warrenty expired 5 months ago & the other day when i turned on my tv there was a 6" thick vertical black line running down the screen. I turned it off & back on hours later & the thick black bar turned into many lines of multile colors. Called Samsung & they told me my warrenty is expired & got me in contact with a repair shop. when I spoke to them they laughed at me! told me i paid $3,300 for my tv & it would cost $1,500 to fix! they told me it would be better to buy a new 1! I paid over %3,000! and all i get is 2 years! am i crazy or is this really wrong?! What do i do? At Best Buy they told me this was the best tv (50" 1080p HD LCD).