Duet 2 Wifi issue. Wont connect after high voltage warning

Justin 0

@phaedrux I dont see any damaged comonets on the boar. I'll attach some images.

The high voltage warning came from the duet at 31.4V. It could have come from the power supply. It came from an ender 3. I don't think the PSU has failed. I will have a multimeter later today and check output voltages.

I don't think any items got shorted and there was no sounds of shorting.

Phaedrux

I'd suggest taking it out completely, disconnecting everything, and checking with just usb connected again. Get some well lit close up shots.

Justin 0

@phaedrux Okay will do. Just checked PSU voltage, its 24v. Measured it 10 times, 1 a min. range was 23.8-24v

Justin 0

@phaedrux Connecting the board via USB with not connections has it working like it was new out of the box

dc42

@justin-0 when RRF reports that the VIN voltage is abnormally high, it usually means that the 3.3V rail voltage is low because the ADC uses the 3.3V rail as the reference. Typically this means that the 3.3V rail is overloaded, either by an external device or by an on-board device. So check whether any components are getting hot, in particular the 3.3V regulator, the SD card, the WiFi module, and the main processor.

If nothing is getting hot, reconnect VIN power and see whether VIN is still reported as being abnormally high.

Justin 0

@dc42 @Phaedrux Nothing gets hot when connected over USB. I'm connected to the PSU and the board is working with not issues (I have power cycled everything a few time to make sure). Vin is reported at 24.3 by the board and 23.8 by multimeter. I don't have time to reassemble printer today, but will do that tomorrow port by port to make sure the board will still function. I appreciate your help!

Phaedrux

Something may be shorting out then. Slowly add back things one at a time to see if you can find what it was. Hopefully nothing got fried.

kb58

@phaedrux said in Duet 2 Wifi issue. Wont connect after high voltage warning:

Slowly add back things one at a time to see if you can find what it was.

^This. Best practice is to plug in each connector with power off, turn it on briefly and read the voltage or watch for the error message, quickly shutting it off if there's a problem. It's now been isolated to whatever cable was plugged in last, so unplug the far of that cable, and power up the board again. If the problem reoccurs, it's in the cable, and if not, it's in whatever that cable connects to.

Phaedrux

Also, let your eyes do some testing first. Look for signs of scorching or browning on connectors and components and wires.

Justin 0

@phaedrux I started adding items back one at a time. It looks like the PT1000 (thermistor and probe) and the BLTouch no longer work but everything else does. My guess is that one of the two could be the cause of the issue that I was having.
Thanks for the help everyone!