I use some UDOO QUAD units. Sevral of these, the PWb switch (power switch) has stopped working from a certain time. I tried to compare with monitor of power switch signal (signal name of circuit diagram is ON_OFF) with good boards and bad boards. As a result, the signal voltage of the bad boards due to the pull-up resistor (voltage dividing resistor) was too low. If someone has experienced such a phenomenon and dealt with it, please give me advice. thank you
