I have just completed a rough schematic for this tester. I hope to create a cleaner version at a latter time.
J1 is the group of header pins where the LCD module will connect with the tester. J2 isn’t really a header, it is just for proper interfacing with any LCD module. I plan on using two DIP14 IC sockets to implement J2. The photodiodes are supposed to be LED’s.
Enough blabbing, here’s the pic:
