I think I have ruined my Duet 2
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Hello to all,
I have been using Duet stuff for quite some time now, but just now registered when (I think) I have just killed my Duet 2.
The thing is I have not followed the directions and fed 5V to the 3.3V rail by miswiring an external stepper driver to my Duet 2 Ethernet, through one of these things:
I know I should not have done that, as per these instructions, but, hey, I did it. People do stupid things. Yesterday was my turn.
Now my Duet is not working: it connects to USB, I could even reflash it through Bossac , but it gets too hot and it simply does not drive motors.
My question is: is there anything I can do about it, including soldering new components, or have I just acquired the most beautiful blue-colored decorative PCB there is?
Thanks in advance for any help you can send my way (even confirming there is no hope left for my Duet)!
André
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Start off by disconnecting EVERYTHING and powering through the USB port only.
What LEDs are lit?
Send close-up clear photos of U2 and U3.
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@alankilian thanks for the quick reply! Here is a close-up photo of U2 and U3.
Only two LEDs are lit, both red and solid: the one between the USB connector and the reset button (5V) and the one between the microSD card slot and the USB connector (diag led).
No 3.3V green LED.
I managed to upload the firmware once again, through Bossac. When I do that, and after I reset the board, the 5V LED still lights up solid, but the diag LED starts flashing really fast.
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OK, good you have the 5 Volt LED.
Bad you don't have the 3.3 Volt LED.
Do you have a volt meter?
You might just have a bad U2 which is a 5-to-3.3 Volt regulator for like $0.50
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@alankilian I do, yes. Where should I measure?
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Set your meter on DC Voltage range of 10 Volts or more (or auto-rang if you have it)
(These are NOT the pin numbers of this part, just numbers)
Put the ground probe on #1
Put your + probe on 2 and measure
Put your + probe on 3 and measure#3 should measure 5 Volts
#2 should measure 3.3 Volts
SeemeCNC Rostock Max V3 converted to V3.2 with a Duet2 Ethernet Firmware 3.2 and SE300
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@zibby said in I think I have ruined my Duet 2:
Now my Duet is not working: it connects to USB, I could even reflash it through Bossac , but it gets too hot and it simply does not drive motors.
When there is a short between the 3.3V rail and a higher voltage on a Duet 2, the components that fail first are usually the SD card, and the WiFi module (Duet WiFi) or the W5500 IC on the Ethernet module (Duet Ethernet). So check whether any of those components is getting hot.
If the main processor is getting hot then most likely it has been damaged too. It's possible to replace it, but not easy.
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@alankilian thanks again. I measure 1.08 V on #2 and -3.2V (negative) on #3.
@dc42 thank you too for stepping in. The SD card and the W5500 IC are not getting hot when powered, but the main processor indeed is getting quite hot.
I guess this means I have fried my Duet. I will try to summon the courage to replace the processor, then.
Thanks again for all the help!
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@zibby said in I think I have ruined my Duet 2:
I measure 1.08 V on #2 and -3.2V (negative) on #3.
That can't be right.
Can you try again?
Although if the processor is getting hot, I guess it's got a problem.
I just wouldn't want you to go through all the trouble of replacing it when you've got impossible voltages right now. It would just blow up again.
