Nope. Potentiometer is OK. I even swapped it out.
Can you verify that the voltage at pin 3 is varying when you turn the potentiometer knob?
liudr,Read the past posts. I hooked up wrong to the backlite, and the pot worked to dim the backlight. I hooked up as it should have been, and the LCD contrast does not work.Now I have a 330 ohm in series with the backlight and control the brightness with a 10k pot. It works. Still, pin 3 does not adjust contrast.