On a board i have a component that on the top overlay its marked Q1 so its likely a transistor. The package is SOT-23 and top of it its written y1.
When testing it by diode tester, a pin behave like the Base pin but the voltage across that pin and two other pins are equal.
So i can not find out which pin is Emitter or Collector. I made a circuit for test it directly the result was that it conduct two way from pin1 to pin2 and vice versa when the base is connected to the vcc through a resistor.