I had the same issue with mine and Compupool sent me both an LCD assembly and a new cell. I installed the assembly and cell last weekend and all appears to be functioning correctly. Install of both took me about 10 minutes. My cell and/or LCD assembly failed about a month after I purchased the unit. Customer service was quite friendly, although they did insist that I have my water "professionally" tested and provide them the results.
Just to be clear, the LCD assembly comprises more than just an LCD display. The assembly includes the display and the printed circuit board to which is attached. There are also a couple of chips and other electrical components on the board.
FWIW, I run the cell at 50% and the pump for about 12hrs a day and my FC stays at about 6-7 with moderate bather load. My CYA level is about 70, so I like to keep the FC a little high and pool gets about 10 hours a day of direct sunlight this time of year.