Using my perfectly working mpu board in my Supersonic to repair a mates Paragon mpu I left a solder splash on pins 17,16 to pin 15 J4 shorting the 5 volt to the 43 volt instantly blowing f4 and locking on the LED,no flicker. Changed all usual parts and replacing the now working Paragon chips U11,U6,U9 still no good. Replaced Q1,Q5,Q2,VR1,CR44. If only I had have been a little less hasty and more careful I wouldn't be asking for help. I have no voltage present at TP6 on the mpu. When replacing known good U9 back into Paragon mpu and hooking up J4 to make sure it was still o.k. it now also had the same problem - LED stuck on, after close inspection I had bent pin 22 so it was not seated in the socket, reseated it and Paragon mpu back to a.o.k. Supersonic mpu LED stuck on. Can anyone help the idiot please???