Re: One very bright unresponsive row on Peggy 2

Home › Evil Mad Scientist Forums › LED Matrix Kits › One very bright unresponsive row on Peggy 2 › Re: One very bright unresponsive row on Peggy 2

June 19, 2012 at 11:28 pm #20725
patholoraptor
Participant

In response to your suggestions:

  • The base pin of Q1 (left-most) is not connected to anything nearby (except RB1) that I can detect using the continuity function on my multimeter.
  • The other end of RB1 is connected to pin 3 of U2, and only pin 3.  Definitely not connected to pins 2 or 20.
  • Forgive me, but I’m not sure I understand what “low-voltage position” means.  I am not sure how to test this. 
I discovered one other interesting thing using my multimeter:  the positive pin of every LED in row 1 is in continuity with the emitter pin (right-most) of EVERY transistor.  Does this mean I have a problem “downstream” of the transistor, or could the issue still be with the transistor?  Thanks!