Referring to KeepIS' post on page 8 of this thread re: removal of diode and capacitor from nano board rear side. I received two slightly different nano designs, one of which I (think) I've identifed the diode and capacitor. The other one at the top is less clear. Anyone want to have a stab at identifying the relevant diode and capacitor?

Soon to attempt firmware downloads ahead of commencing the build.

EDIT: Made an Error with the two boards shown

There are two types of the SECOND board, one does not allow you to disable the +5V supply, and it looks like that is the board in the photo.

Sooo! the second board is NOT correct. However removing that CAP does disable the Nano reset problem (checked), use it for the LCD displays or for poidas Saturation tester.

Just out of interest, I extracted the +5V pin on the USB socket and that obviously solves the +5V problem (same as removing a diode), but it's not feasible for most.

A final thought, in my inverter I have a small adaptor cable from the USB socket on the Nano to the Cabinet front panel for a tablet or PC if a Menu Setting needs to be adjusted. You could simply disconnect the +5v wire in that lead, if you had a few of those boards that would at least solve that problem.

The First Board?

I don't have one exactly like that? The Cap and Diode can be in very odd places on some boards. Measure from the reset pin to the cap, one side should be connected to the reset pin. Removing the Cap at least removes the reset issue.

As a refresh:

1: The Diode isolates the USB external +5V from the Nano controller.

2: Cap removal stops the USB Port from resetting the Nano controller on port connection and when connecting to a Serial program for setting the Menu options.
:
Edited 2026-09-04 14:37 by KeepIS

Corrected previous post, slight difference in the boards that I missed the first time I replied