:: What is your goal?  From your circuit you are not showing the 620
:: ohm to +V

My goal is to suss out, then use these two graphics modules that I 
have aquired from my two defunct Xerox Phaser printers. These are 
obviously a commissioned production run from Tektronix/Xerox by 
Hyundai.

My problem is tracing where everything goes, especially as many tracks 
and vias go under the glass itself. 

As the circuit shows, the 620 ohm resistor is switched via the uC (pin 
44 to be precise). You are correct I could just make my own circuit, 
but the backlight, Vee generator and what looks like it might be a a 
watchdog arrangement + 6 button pads and two Led's are already on the 
board. Now in reality that is all I need to know, I can easily get a 
Pic to go high and switch the backlight on, but I'd like for reference 
purposes to have an accurate schematic.

Colin
--
cdb, colin@btech-online.co.uk on 14/08/2009
 
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