Diagnosing a probably bricked Duet2
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My room temp is about 25C but no component is above 31C. Checked the wifi module, U11, U2, steppers, processor... Nothing seems out of the ordinary. I believe the U11 is the 3.3v regulator.
Unfortunately I don't have a 3.3 ext PSU.
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(if you happen to have an arduino board or similar you could perhaps borrow 3.3v from that)
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@bearer Excellent idea!
Did this and now the Duet2 board is detected by the OS and I can connect to it using Pronterface. Should I try inserting the SD card now?
Bus 001 Device 022: ID 1d50:60ec OpenMoko, Inc. Duet 3D Printer Controller -
Oh, you might have gotten lucky! I'd look up the datasheet for both 3v3 regulators and just swap them if pin compatible and sufficient current on the arduino one.
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God, I'm so relieved!
What component is the regulator I must replace? I've been wandering around the KiCad project but I'm a real noob at this
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I'd keep the champagne in the fridge till you test the drivers and everything else.
If the board didn't work with usb but does with external 3v3, then U2 is probably toast at least. I'd remove that, then test if you get 5v with 24v applied (before installing the new U2)
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@bearer Yeah, I have a presentation to write right now but I'll do a full test, connecting the board to my Voron. If the processor is alive, it's a great thing already. I'll start replacing U2 (no pun intended).
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I've replaced the U2 voltage regulator of my Duet2 board but the component is still outputting 0.3v and works fine using an Arduino on the 3.3v rail, as recommended.
How can I diagnose the C4 capacitor of the 3.3v regulation system?
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@dc42 said in Diagnosing a probably bricked Duet2:
so on Duet 3 we've taken great pains to protect it against even a short between +24V and the external +3.3V pins.
not directly related to the topic but..
I made (with a friend) an ethernet stepper controller (similar to MESA 76ixxE cards only with Virtex FPGA instead of Spartan so ethernet in, stepper/servo/encoder/sensors signals in-out) and protecting all io's was not too hard, for digital input simple 5 to 36V differential 1MHz opto inputs are not that expensive, for outputs 1000V isolated 2MHz differential outputs are also fairly cheap.. user can do anything with input/output the board will survive.. (as long as user don't short anything on board
that's why board is in case ) ... if duet3 is to be used in industry having everything 36V (or 48V depends on industry) safe is kinda must now for analog inputs we use mcu that's talking spi with fpga and that spi is 1000V isolated so in case of crap entering analog input mcu can die (there is a spark, shottky from vss and to vcc, a ferule bead and few tantalums but ... still) it was cheaper solution than opto isolated linear opamp that would be a better solution (but you can get 10 mcu's for the price of that opamp
so mcu it is) -
@kauedg said in Diagnosing a probably bricked Duet2:
How can I diagnose the C4 capacitor of the 3.3v regulation system?
good in-circuit esr tester would be the easiest thing, but, when you blow the circuit like that I always recommend replacing all capacitors on the power rail, especially main output cap like C4 in this case... so just trash it and put a new one in, will save you lot of grief later
