Duet 2 Wifi issue. Wont connect after high voltage warning

Justin 0

@phaedrux I ran through the two links you had. The duet was good on the https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond up to the diag LED. It is constantly lit when connected to the board is powered by the PSU.

I tested this by putting an old know cood config file, no change. I removed the SD card and no change. Reset button is not stuck on the board.

The board shows up on the PC and communicates with the PC.

It seems that the DIAG LED is an indicator that something got fried.

Running through the https://duet3d.dozuki.com/Wiki/SD_Card#Section_Troubleshooting_SD_Card_issues
M122 yields a .2 MB/s. This indicates a bad processor or SD card slot according to the link.
Running a file transfer test yields:

M122 P104 s10
Error: Failed to create folder 0:/gcodes in path 0:/gcodes/test.tst
Error: M122: Failed to create file

Just to rule out any SD card issue, I bought a new SD card with 10MB/s write and 100MB/s read, the same issue occurs. There is no visible damage to the SD card pins.

One thing that none of the guides mention that I think maybe another clue is the LED on the wifi module never lights.

From here, it seems those articles are pointing to a SD card and/or a processor issue on the board.

Do you know if there is anything else I can do?
Is there anything that Duet is able to help me with on the board if it is an SD card reader or processor issue?

I really appreciate your expertise and help!!

Phaedrux

Do you see any damaged components on the board? Can you post some photos? Do you have any idea what the high voltage event could have been? Did the PSU fail? Did something get shorted?

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!