I have an LG60UF7300 and the picture is scrambled

I have an LG60UF7300 and the picture is scrambled

the menu’s are clear and the sound is fine but no picture from HDMI inputs and UHF input.   I’m guessing it’s the main board.  The picture is random pixels frozen no movement.  Any Idea’s where to look for the problem, it was working fine then just scrambled and has not recovered.

ANSWERS: