The LCD used in the Photo Therm SK4 (not the super) is a standard 2 line by 16 character LCD. They are pretty standard devices. I bought one on ebay for like $7 then soldered it to the cable. I also hooked up the LED Back light which required a 330 ohm resister (available at Radio Shack).
Originally Posted by sage
If your LCD is flakey though, I'd re-seat the connector on the main board. The biggest reason I replaced my LCD instead of fixing the one in the machine is that I wanted a back lit LCD which is far easier to read.