there is a trouble on power supply board.....usually bad capacitor .
do you have any experience on electronics repairing ? If you need a tech service I can recommend you these guys www.tvrepairjacksonvillefl.com but they work in Jacksonville FL, you should search a similar service near your zone.

I consider you must check the capacitors. If you want to contact a tech I can recommend you www.tvrepairjacksonvillefl.com but these guys works in Jacksonville FL, you should search near your zone. Good look!