VIZIO P42 plasma, half screen ok, other half...

Question

I have Plasma Tv. My screen is split. One half shows the picture, the other half shows one green band. What could be the problem. I opened the TV , but nothing looks short. I am knowledgable to certain extent on chnaging boards. Any help would be apprecated? Could it be mother board or the screen drivers. The screen is split vertically. So left side is blank and right side has picture.