I would really wanna know how to do this...
oh , sounds like one big job to figure this out, is there any logic way to do it?
Most likely the pins are in a logical layout on the board. I would guess A=1,B=2,C=3 or A=10,B=11,C=12 or something like that.
One thought is to try to connect a voltage to the display and see what light up, and that way "reverse engineer" the pin layout.
Do you still have the display intact/working?
Does it have common cathode or anode, NO IDEA.
I would guess its 5v, but PLZ don't trust me, I really have no idea about this stuff. There is no resistors between microcontroller and display, do all mircocontrollers output 5V or 3.3V? Dont know that either...
I would love to know what microcontroller is used on this board, but I think that's impossible to find out...
PLZ people with the knowledge, come help out!
EDIT: It runs on 3 x AG13
I have the same pH meter without the IC
Don't know if this helps:http://www.pictureshack.us/view_50227_pH.jpg
For some reason I dont seem to be able to post pics...
There's one "line" with 2 dots, that's the only one connected to 2 pins for the display, so I could and would guess that that's the common cathode or anode...
Or it might be the 1x.x
So it a 18.8
display, you cant display 28.8 on it, the first number is only 1 or off. I guess you could say its a 0.0-19.9 display