Hello,
I have bought one of your traffic light products (MK131), I am having trouble with the lights since the lights are on in one direction and they do not change, it has been soldered professionally therefore I do not know where the problem is. I do not know which component has the defect.
Thank you please respond asap.
Most likely an assembly problem in the oscillator section, around the two transistors.
Did you ever figure out what was wrong? I have a similar problem. Initially two reds lit, I found one green led with a reversed polarity. Then I had two reds and two greens, but they would not sequence.