I'd built my circuit though the circuit is quite complicated. However it seems like my LCD module show nothing when the circuit is being connected. Might want to ask what is the minimum requirement to run a LCD module? At least i can know is it functioning. I am using this model: JHD162A. I use 9V source supply and I measured the voltage at the Vdd as 1V, Vout around 0.2V. Thanks for guidance.