Screen is black, audio is fine. TV is 2 yrs old.

Question

This TV has done this before--no loud pop--but always came back on. Now I turn it on and nothing but audio. Channels, inputs, remote, are all OK.Is it the y-sus and/or z-sus board(s)? How do I identify these? Are the part numbers on the boards? Is there anything else to check before I buy parts? Is this failure because of a cooling issue? The Super Bowl is Sunday. I gotta fix this thing! Please help!