duet 3 unresponsive on VIN

hikkakaru

@dc42 said in duet 3 unresponsive on VIN:

IMO it's worth erasing the firmware and reinstalling it using Bossa to see if that fixes it, especially if it was running pre-release firmware.

OK, will do. I have tried flashing the firmware with DWC successfully, but with no avail to the problem. is a Bossa reflash more thorough?

dc42

@hikkakaru said in duet 3 unresponsive on VIN:

@dc42 That's interesting. I powered off right now and tapped the reset key a few times; when I powered back on it came on no problem -- might I be experiencing a sticky reset button somehow?

Does the reset button feel normal, i.e. a slight "click" when you press it?

hikkakaru

@dc42 I didn't notice any strange feeling mechanically. Seemed fine to me, but system came up after playing with it while off.

Probably just coincidence, if I keep power cycling it seems I get a successful boot about 40% of the time.

I've also yet to experience an unsuccessful boot via USB power.. so that leads me to believe the switch itself is fine.

dc42

@hikkakaru said in duet 3 unresponsive on VIN:

OK, will do. I have tried flashing the firmware with DWC successfully, but with no avail to the problem. is a Bossa reflash more thorough?

Only in that it re-flashes the fuse bit that sets the bootloader mode.

I guess another possibility is that the RESET pullup resistor is missing. If you have a multimeter, try measuring the voltage between the two pins of the EXT_RESET connector. It should be 3.3V.

hikkakaru

This post is deleted!

hikkakaru

@dc42 said in duet 3 unresponsive on VIN:

If you have a multimeter, try measuring the voltage between the two pins of the EXT_RESET connector. It should be 3.3V.

those two pins, when it's in the dim LED mode, are putting out 0.2vdc for me. I haven't tested it when booted.

hikkakaru

picture of booted via usb. Never any problems booting over USB voltage. Notice the active ethernet port.

EXT_RESET still puts out 0.2vdc while booted up via USB.

hikkakaru

I will reflash firmware with Bossa when I awake in a few hours.

Any tips or tricks in the mean time are appreciated.

dc42

@hikkakaru said in duet 3 unresponsive on VIN:

I will reflash firmware with Bossa when I awake in a few hours.

Don't bother, there is definitely something wrong with the reset circuit on your board. I suspect that either R30 (which is close to the green VSSA fuse) is missing, or there is a weak solder bridge under the EXT_RESET connector.

I approve a warranty replacement for your Duet 3. Please accept my apologies on behalf of Duet3D for the inconvenience this has caused you.

hikkakaru

oh okay.
Thanks for your time and diagnostics. I'll get that started ASAP.