This is only a guess. It sounds like a cracked LCD. To remove it should require a trip to the repair facility.
This unit showed up in 2006 so given what repairs run, I'd shop for a replacement then ebay this one.
I have an image on my screen that I can not remove and when I called JVC they had no clue and suggested I send my camera in for repair. Does anyone know how to remove it. It looks like a big black spider with a web across all screens