kc868-a32 ethernet problems

[jy1999]

just got a new kc868-a32, connect to router with ethernet cable, same as my desktop etc. Using power adaptor from the package, 12vdc 2A. But, the connection is not detected by Home Assistance, nor I can see from my router network map etc. Changed ethernet cable as well. Tried resetting the board, and power off/on multiple times, still no lucky.

I am using the ESPHome script in HA, as suggested by KC. Appreciate any help or suggestion. Thanks.

I had exactly the same issue.
It's a hardware issue. You need to check if the LAN8720A chip gets hot.
If so, you need to replace it yourself or send it back to the seller.

Thanks. I did find the problem of cold solder of the chip. I have tried to fix it yet, but I can see some soldered pins are not very good.