My DFrobot keypad LCD purchased Jan2013 also has a 1K resistor for R7. (you can measure it between pin10 and the Vcc pin) The board matches the pic posted by Rocketeer503. Unfortunately this means that neither a 500R resistor or a 1N34 diode from the transistor base to pin 10 will turn off the transistor. I tried both and they only drop a couple of mV from the nominal 0.8v base voltage - not enough to turn off the transistor. My bare board draws 8 mA with pin 10 grounded and the LCD backlight off or 25 mA with the light on. I think I'll just leave the pin 10 trace cut and soldier on without dimming capability.