My venerable 30 year old HP-11C is getting a black splodge on the LCD screen (when calculator is both on and off), and seems to be growing with age. A photo of the problem is below.
https://docs.google.com/file/d/0ByRUk1Zt3XiLTlpXdHJ0QVE5TEU/edit?usp=sharing
Can anything be done about this?
Larry