"@dimbie could be the backlight. turn your camera on in a dark room, use a flashlight and angle it against the LCD screen. See if you can make out anything i.e. Menu etc. After that check the power on the backlight connector FP9004 with a multimeter and see what you get. The backlight is a separate item as shown on here Let us know.
The LCD monitor went black on my Panasonic DMC-FX200. I could still see images through the viewfinder. After many days, I realized I had inadvertently pressed the EVF/LED button. By pressing that button again, now works.