Re: Ethernet Troubleshooting
I have a board with the LAN8740A, don't know about differences to the LAN8720A. I'm using MII.
I have posted the schematic here about 1 to 2 weeks ago, maybe that helps.
Are you sure that you used the same RJ45 (with integrated magnetics)? There are so many variants, it can be confusing (at least for me).
For the supply voltage, I can measure a bunch here if you want.
Until now, only one board was DOA in regard to ETH. But the reason was visible: A big blob of solder.
Feel free to ask, if my LAN8740A is of any help.