The back screen on my kodak C743 is malfunctioning
You are correct. The LCD screen is broken. This is super common with the C743. It is unprotected and unlike most LCD's, there is no hard plastic or glass screen over the LCD. My wife broke my son's 1st 743 when she left it in her bag. My son broke the second one by packing it in his duffle bag for a summer camp trip.
You can spend about $40 for a replacement that will probably break again, move on to another camera or use this as a "green mode only" point and shoot camera just like the old days where you don't know what you got until you get home. You can still hook it up to your TV set to change the settings and review your pics, but that's all you are left with.