I'm sorry to hear that you're having this issue. I'd recommend having the unit inspected to see if the problem is related to the previous issues. Unfortunately, I'm not able to assist with service related inquiries, but I'd encourage you to contact the Samsung customer service center in your region for further assistance.
I have the following Samsung TV - LN32B460B2DXZC ... and am having an issue with a green cloudy faint screen ... I have posted a photo at: www.thechowaniecs.com/images/tvphoto.jpg. Photo was taken in a dark room with no components attached.
Main board has now been replaced twice and I am still having the same issue ... suggestions?