ESP32-POE problems on just UEXT pins?

[KeviNH]

Has anybody seen an issue where Post in UEXT subforum? 

Specifically we are using a ESP32-POE-16MB, connecting to Serial1 (on GPI36) via the UEXT, and in a deployed device it became unreliable sporadically,then yesterday just stopped working entirely.    A multimeter shows no continuity between the board edge EXT for GPI36 and the corresponding pin on the UEXT.

Not seeing any physical reason for this fault, no unusual mechanical stress on the ESP32-POE-16MB board.

[LubOlimex]

There is physical reason by design for this behavior. Check D4 diode on the GPI36 wire, diode is near the UEXT and it leads to this continuity behavior.

Diode is placed to prevent accidental parasitic powering via the UART. If you are good enough with the soldering iron you can remove the diode and solder the pads together, this will lead to similar behavior as other pins at the UEXT.

Notice that GPI34 is only input regarding the ESP32 chip, this is by Espressif design, hence we decided to name the wire as GPI34 (as opposed to GPIO34).