I'm stumped. I just finished the LO section. After the first section (power supply) All was well. 3.3v and 5v were solid. Current draw perfect.
Current draw with resistor in LO section was right on. HOWEVER now I can only measure .7v at 3.3 rail and U4 becomes VERY! hot. Further, voltage at U5 measures 5v coming in on the two outer pins on input side and .7v on both pins on output side. (go figure) All switches on SW1 set to 0. U6 in properly. SI570 appears to be soldered perfectly under scope. No visible solder bridges top and bottom. What the heck???? Dohn N8EWY
