duet ethernet controller fried

johanV

Hi,

I have duet ethernet and a duex5 on my printer.
I don't understand why or how but, during a print job, i heard the the noise of death coming from the little ethernet controller board.
the CPU felt verry hot and the ethernet controller IC had a small hole in it.
I don't know what to do now.
i have the knowledge and experience the main CPU but i don't know if there is a special bootloader installed or not.
what if I buy an new duet ethernet board, can i safely hook it up to my duex 5 board?
is there a way to test if the duex5 is still good/safe?
i think what happened is one of the motor wires somehow made connection to the 5V line of a sensor input.
does anyone have experience that can help me?

Phaedrux

Can you capture some close up, well lit photos of the board when it's disconnected and removed from the printer? We may be able to identify damaged components.

johanV

@Phaedrux alt text

I tried to take a couple of pictures.
All I can see is that coil/inductor L2 is broken because it haze a hole in the center but none of the other components
Show signs of damage. the Ethernet module is also pretty fried but for this I have a replacement.
Is noticed that the cpu gets hot when doing nothing ( I erased the firmware and disconnected everything but USB ) and component u2 ( I think a voltage regulator ) is also pretty warm but not as hot as the cpu.
Maybe, if the cpu is fried it overloads it is voltage source. I measured the 5 and 3.3 voltage rails and they are on the low side. I measure 3.15v and 4.25v

jay_s_uk

@johanV U2 is the 3.3v regulator.
If the CPU is getting hot to the touch when doing nothing then thats not a good sign and it may have died too.
If you connect via USB, does the computer detect it?
I have some refurbished duet 2 ethernet boards for sale if you're interested

infiniteloop

@johanV TR4 looks a bit "stressed", too …

johanV

Hi,

I did some measuring and it seems there is a resistance of 12ohm between 3,3v and ground.
that is enough to pull the 3,3V line to low and perhaps also the 5V line.
the problem is that for as far as i can see the CPU is not the only component on 3,3V. the stepper drivers are also on 3,3V so it can also be any of those as well. they are however not heating up.
by now i have also found out that the CPU is not on stock on any of my usual web shops. delivery dat is mid 2023 at best.

when connected to USB, the computer detect something but does not know what it is ( maybe because i erased the firmware )
it is listed as unknown device. i reinstalled the duet device driver but this made no difference

in real life, TR4 still looks good.

Phaedrux

When and where did you purchase your Duet?

johanV

@Phaedrux
To be honest, I don’t actually know anymore. Ik think it was 2018 or 2017. And I guess it came from either 123-3D or from the duet3d webshop. Why ?

Phaedrux

If it were a new board warranty may have been an option. Given the age, that's unfortunately not possible.

Nightowl

@jay_s_uk When you say you have a few refurbished Duet2 boards available, and assuming I could use one to run a CNC machine, I could be interested.

It's possible I'm being given the opportunity to test a CNC machine, but it's unlikely to have a control board, so if you still have one (and I do get the machine to test) would you be willing to sell one to me, please? PM me the details and we'll go from there

Thanks

jay_s_uk

@Nightowl PM'd