PIC16F819 pin no 3 RA4 (0 = Enable power supply output)
connect to Q11 (smd code R34) and Q11 connect ot LM2642 pin no 10,11,12
ON/SS2 (Pin 10): Channel 2 enable pin. See the description
for Pin 9, ON/SS1. May be connected to ON/SS1 for simultaneous
startup or for parallel operation.
FB2 (Pin 11): Feedback input for channel 2. Connect to
VOUT through a voltage divider to set the Channel 2 output
COMP2 (Pin 12): Compensation pin for Channel 2. This is
the output of the internal transconductance amplifier. The
compensation network should be connected between this
pin and the signal ground SGND (Pin 8).
PIC16F819 pin I suspect Q11 problem but can't find part number and not sure Q11 is transistor or fet
Please wait other member for help you..