I consider the problem is due to a defective board. The problem could also be brought by the power supply or the control circuits are destroyed. You need to reset your TV by removing the power cord and then plugging it back. Alternatively, contact a technician to help you fix the problem.
Here you are a tech website www.tvrepairjacksonvillefl.com
You should search in your zone an contact with different repairers and dealers to compare the prices
abel, August 2012