@john81163 if there is no menu showing or anything then it is most likely the LCD screen itself. It is possible that this is a backlight issue, so darken the room and turn the camera on. Now use a flashlight and angle the light at the screen on different areas. See if you can make out the cameras menu. If you do, then it is possible that this is a bad backlight . If not, I would proceed to replace the screen.
Since iFixit doesn't yet have a guide for this, use something like [https://www.youtube.com/watch?v=cIHUXNJNWtU|this video] or even [https://www.youtube.com/watch?v=v8eS_IMeh4A|this one] for the replacement.
While you work on your camera, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has a device with the same issues as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.
Repair is War on Entropy!