I have been facing this problem since last 6 months with my Samsung LED TV which was purchased in August 2011. There is a black line covering half my screen and hence unable to watch the upper portion of my 40 inch LED TV since September 2012. Initially this line would go off post 15-20 min of switching on the TV but post few month this line became permanent.
In May 2013, I had an engineer visit my place and he very bluntly concluded that we need to change the panel and the same would cost Rs. 24, 000. This is not reasonable as in just 18 months of purchase, I need to spend Rs. 24, 000 for repairs! Later the customer care called and stated that they can get it repaired for Rs. 20000, giving a discount of Rs. 4000 with no guarantee for the new panel!
This is definitely a case of selling a defective model. I am just ready to pay max 25% of the repairs only.