Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the camera.
Still, the described symptom almost always point to an internal hardware issue or more particularly, the LCD screen itself as the most likely suspect.
If comfortably able and feel safe to do so, are you then considering a DIY (do-it-yourself) repair approach? If yes, then the replacement LCD screen may be available from some online sellers (depending on the model) something like the product offered HERE.