Duet3D Ethernet _ Short

DustyPhoenx

Hi all,
Electronics are not my speciality, but I think my board may be beyond economic repair!!
I managed to short circuit the board on my CNC machine today - this happened in mid-carve somehow. Now all I have is 3 red LED lights & 1 blue LED showing on the board. The Fans don't run & the Ethernet port has no LED lights working - I'm assuming that the board is fried & will need replacing, but I would like to check before I buy another one? Thanks in advance for any info.

A Former User

Three red leds is not very specific, ref https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_LED_indications

Also see https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond for basic dead board troubleshooting, but the lack of a green led isn't promising no.

DustyPhoenx

As I said - Electronics not my speciality... but thanks for the info. that's helpful
The Red LEDs are:
5v / E1 Heat & BED Heat

The Blue is the VIN

A Former User

We can say for sure the 3.3v regulator then has some problems, its labeled U2 and three legs + a tab, but it can fail without visual damage.

Having E1 and Bed on could mean more trouble, but really need to fix the 3.3v problem to diagnose it.

As far as economical repairs go, parts still cost money, but https://forum.duet3d.com/topic/13875/community-repairs might help with the rest, but it would be beneficial to have a rough idea of what is broken. Maybe some pictures could help diagnose.

DustyPhoenx

@bearer

Hope this helps. There's no visible signs of burning anywhere

A Former User

The what to do guide says to remove the SD card, but you can also try removing the Ethernet module to see if that makes any difference to getting a green light (release the stand offs and pull straight up). Its a long shot, but

A Former User

@DustyPhoenx said in Duet3D Ethernet _ Short:

There's no visible signs of burning anywhere

More often its just a hole in one of the chips, or a bulge. The boards have fuses and features to prevent scorching of boards and wires.

But couldn't really see anything, a would need a cleaning and more resolution to be sure. But try removing the sd card and ethernet module, and see if you get a green light when powere from just usb.

DustyPhoenx

@bearer said in Duet3D Ethernet _ Short:

The what to do guide says to remove the SD card, but you can also try removing the Ethernet module to see if that makes any difference to getting a green light (release the stand offs and pull straight up). Its a long shot, but

@bearer no that has made no difference, just the 5v led & the usb led are lit. Looks like a replacement to me

A Former User

replacing is the way to go if time is of the essence; it could probably be repaired but can't with certainty say what the part would set you back nor how long it'd take depending on where you are etc. your call.

DustyPhoenx

@bearer thanks for taking the time to try & help me. Much appreciated