Using bipolar transistor for wwitching

[nissim]

Hi There

I am trying to switch an LCD display from a micro port .
My circuit works fine without a load .
When I use LCD as a load the transistor does not turn off and instead 0vdc
I get 3.75VDC.
I tried 10K resistor across the load but same problem

I would appreciate if someone could explain me the reason for the problem and suitable solution .
If bipolar is not a suitable solution I will consider using N MOSFET

Many thanks
Nissim

[pebe]

The feed from the micro to Q2 base should include a resistor to limit the base current. Perhaps Q2 has been damaged and has gone s/c from emitter to collector and is keeping Q1 switched on.

Other than that, there is no reason for the circuit not to work