If you touch the LCD touchscreen and it’s not responding correctly (it selects different option than you chose or it’s not selecting anything), probably you need to recalibrate it.
To do this, quickly tap the touch screen more than 20 times in 4 seconds. Do not click any button area, until you hear a long tone. Enter calibration mode, follow crossing points and touch all of them to calibrate.
Your LCD is calibrated!