I had already replaced C5 with 100nF. I have replaced C5 with 470nF . Nothing has changed, I'm still only getting 4.5v.
See the attachment for jumper setting, schematics, boards, etc.
USB power only R8 4.6V and 4.5V (each side), MCLR 0V.
Software 5v No change
software 16v R8 4.6V and 4.5v (each side), MCLR 4.6V
After looking at the schematic this afternoon 12V on 2550 is a big NO !!
I spent lots of time this afternoon going thru the schematic and the board. A couple of things I did find:
With software 5V on pin 12 0V pin 23 .01V
With software 16v on pin 12 0V pin 23 2.6V, pin 23 should be at 5V
Thanks to both of you for the help, Lou