Duet 2 wifi, Bltouch won't deploy anymore

skhotso

@phaedrux
Just went through the "unresponsive" troubleshooting steps and everything is good from leds to usb port recognition.
The 5v led was dimmer than the 3.3v led but I would think it's due to the usb port of my laptop, and not a real issue.

I felt around for other hot components and found this one chip was mildly warm. Red arrow on right.
I used my flir infrared cam on it and found a component(capacitor or resistor?) next to the usb port was heating up.

I'm not sure what that chip does or if it's normal for it to heat up.

The only thing I can think of that touched shorted the 5v or 3v rails is the bltouch connector but I hadn't touched that area before the BLtouch deployment issue.

one possibility is the bltouch shorting internally but seems like it'd be a rare case.

Anyone care to chime in on what that IC does and if possible to just remove it for testing purposes or permanently?!

skhotso

just thought of another detail that may be relevant.
The night before I had this failure, I was attempting to autotune the heatbed pids. It ran for over 20 minutes with no results so I hit the emergency stop button and kept my old pid settings.

Phaedrux

@skhotso said in Duet 2 wifi, Bltouch won't deploy anymore:

I was attempting to autotune the heatbed pids. It ran for over 20 minutes with no results so I hit the emergency stop button and kept my old pid settings.

Tuning can take quite a while when the bed is large and takes a long time to cool down between cycles. Though I don't think hitting the estop mid tune should damage anything.

@skhotso said in Duet 2 wifi, Bltouch won't deploy anymore:

Anyone care to chime in on what that IC does and if possible to just remove it for testing purposes or permanently?!

Can you tell me the silk screen labeling for those ICs? U3 perhaps? Don't remove anything. How hot are they getting? too hot to touch or just warm? Do you see any pot holes on the chips? Can you post photos?

skhotso

@phaedrux
I didn't time it but it did seem like it was taking longer than usual.

There aren't any silkscreened labels around the the IC other than for the adjacent components.
It is this ic with the hc125 part number on it. It's not burning hot, just warm. The MCU is burning hot though.

No potholes or visibly damaged components.

The funny(maybe not) thing is everything seems to work fine except for the bltouch deploying. I can home all, jog, start a print, update firmware through dwc, etc.
Dwc says MCU was up to 100c while flashing firmware. I had a little fan on it in case, it likely would have went even higher without.

dc42

@skhotso the component next to the USB port getting hot looks to be the diode that feeds USB power to the board. It will be hot if you are providing 5V power through the USB port and something either on or off the board is drawing excessive 5V power. That could be the microcontroller, or possibly the BLTouch is drawing solenoid current continuously (normally it activates the solenoid only briefly).

If the MCU is hot, that normally means that the MCU had been damaged and part of it is not functional. It might perhaps be the part that drives the BLTouch servo pin.

The 74HC125 chip drives the stepper driver SPI pins and the DIAG LED. It should not normally run warm.

skhotso

@dc42 said in Duet 2 wifi, Bltouch won't deploy anymore:

@skhotso the component next to the USB port getting hot looks to be the diode that feeds USB power to the board. It will be hot if you are providing 5V power through the USB port and something either on or off the board is drawing excessive 5V power. That could be the microcontroller, or possibly the BLTouch is drawing solenoid current continuously (normally it activates the solenoid only briefly).

Nothing was plugged into the board at the time I was viewing the heatmap. Likely just the mcu then.

If the MCU is hot, that normally means that the MCU had been damaged and part of it is not functional. It might perhaps be the part that drives the BLTouch servo pin.

got it. looks like no one will have the mcu in stock until december of 2022! yikes.

The 74HC125 chip drives the stepper driver SPI pins and the DIAG LED. It should not normally run warm.
the diag LED flashes for a quick second when turning on but it's normally off. and the steppers all work fine so i'm wondering if that's even bad at all.

Anyone got a spare ATSAM4E8EA-AU lying around?

Gixxerfast

@skhotso No, I def don't. But in what part of the world are you? I know of a guy in Norway that used to fix these boards. But chances are you're not in Norway

skhotso

@gixxerfast haha. I'm in the US. I've repaired some flight controllers in the past so I think I can do the SMD replacement. Just need the chip.

Gixxerfast

@skhotso OK Yeah, flight controllers, then you probably know what you're doing

No all ATSAM chip seem to be unobtanium right now for the mere mortal ones. Tried to order some SAMC21 chips but not available before mid jan 23. I'm not that patient.

dc42

@skhotso Microchip Direct has some SAM4E16E-AN available, see https://www.microchipdirect.com/product/ATSAM4E16EA-AN. It's the same as the 4E8E with more flash memory.

skhotso

@dc42 nice. I already ordered a new one from filastruder last night. I've got orders to fill! I'll still order the mcu and save it as a spare.

I wonder if the 74hc125 getting warm is the cause of my z steppers stalling...
man, I wish I had gone into computer engineering.

Phaedrux

@gixxerfast said in Duet 2 wifi, Bltouch won't deploy anymore:

@skhotso No, I def don't. But in what part of the world are you? I know of a guy in Norway that used to fix these boards. But chances are you're not in Norway

I wonder whatever happened to that guy...

Gixxerfast

@phaedrux said in Duet 2 wifi, Bltouch won't deploy anymore:

I wonder whatever happened to that guy...

AFAIK, he's alive and happy tinkering with other stuff

skhotso

new duet2 wifi board did the trick. no issues so far.