Insignia NS-50DR710NA17 lights up, back picture doesn't come on

When turned on my TV lights up and after taking off the back cover, the LEDs are on however no picture is displayed. There is a small white box in the bottom left hand corner, but no picture. Shining a flashlight on the screen in a dark room doesn’t show any picture. Sound can be heard when clicking the arrows, but nothing can be seen on the screen. Could this be a bad video board or transmitter sending the signal to the tv and if so any recommendations on replacing it?