The LCD display on one of my Butterflys died under mysterious circumstances.
It has been sitting on a window sill for 1 year and 10 months. The LCD faces toward the window. The Butterfly monitors the outside light intensity with the built-in light sensor. It is attached to an X-10 remote control. It turns night lights on at dusk and off at dawn.
The Butterfly does it's job perfectly but the LCD display does not work. I first noticed a problem about 8 months ago. I picked it up and waggled the joystick, but no joy. I tried it the next day and the LCD worked. At least that's the way I remember it. I tried it a few months later and the LCD wouldn't work. It hasn't worked since.
The coin cell battery seems to be good and puts out 3.0 volts. I removed it and am now powering it from an external supply. Still no LCD. The RS232 works. I can send it commands and get responses. I reloaded the software with the bootloader. Still no LCD.
The joystick works and the current draw looks good. Everything is okay except the LCD. Do you think sitting in the sunshine for 2 years killed it. Maybe it overdosed on vitamin D. :)
P.S. This is a stock Butterfly with the original Mega169pv. Never been overclocked!