You should check the connection lower belts and look for components no soldering.
If the TV is under warranty, have it repaired. Otherwise, call the manufacturer helpline and ask them how to diagnose the problem. You can also call a local TV repair shop for an idea of what is going on and what it would cost to repair.
Here you are a tech website www.tvrepairjacksonvillefl.com
I hope this help. Good Luck
abel
August 2012