Hi, I built your component tester with PCBs from pcbway and your guide, no matter what I try, whenever I press the encode button the screen goes all white, and goes black when I release it. The only things I have changed are the S9014s are swapped for 2N2222 and the S9012s are swapped for S8550. I have ordered the correct ones, but the LED does not turn on either. Any Ideas? Or is it likely the transistors? Thanks