Description (copied from https://www.duet3d.com/DuetEthernet)

This is the latest PCB revision of the Duet 2 Ethernet, v1.04.

The Duet 2 Ethernet is an advanced 32 bit electronics board for the control of 3D printers and other CNC machines. It has the same features as the Duet 2 Wifi, other than providing ethernet connectivity rather than Wifi, a full feature description is available on our documentation, in summary:

The Duet 2 Ethernet can have Thermistors connected directly, alternatively we have two different temperature sensing daughterboards available:

We also supply genuine e3d PT100 and thermocouple sensors compatible with their range of hotends:

Wiring

Replacement parts

https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers

Fan mosfet

If you short out a PWM fan, the fan driver mosfet will burn out. The replacement part number is PMV40UN2 or PMV40UN2R which is available from the usual electronic component distributors such as Farnell/Newark/element14, Digikey, Mouser and RS. You can also use type PMV20XNER or AO3400A which have a higher peak current rating. The component identifiers on the board are:

To remove the old mosfet, you will need either a hot air desoldering tool with a small nozzle, or low melting point solder such as ChipQuik . If using hot air, use a shield made from e.g. corrugated cardboard covered with Kapton tape to shield connectors and other plastic components from the hot air. The new mosfet can be soldered in place using a fine-tipped soldering iron, or by putting a little no-clean flux on the pads, placing the new mosfet on top, and using hot air again. Hot air soldering/desoldering is easier if you heat the whole board to about 100-125C on an electric hotplate.

Heater MOSFETs

Note when removing any of the heater MOSFETs there is significant heat-sinking into the copper of the board. A combination of hot air rework, Chipquick, and a heated plate may be needed to remove one successfully.

Mini blade fuses

TFT panel backlight inverter IC

If the TFT panel of a non-integrated PanelDue assembly suddenly refuses to light up, chances are that the backlight inverter chip has failed. This is a 6-pin chip marked L6CE or L6EN or L6GE or similar (the Pin 1 marking bar can easily be mistaken for a letter I in front of the L). The part number is MP3202DJ. It is available from RS Components, Digikey and Mouser, and also on eBay and Ali Express.

Other things

(warning) Duet has no support for POE and will be fried if it get's connected to passive POE like Shanqiu Mini UPS FX5-48 / Vultec Continuity UPS30PW-DC has got.