Bricked Duet2 SBC Ethernet
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Hi,
I have a problem with my Duet2. Everything started with that the E5 and E6 Heater on my Duex5 was always on. Then I turned off the printer completely and unplugged the Duex5. But the printer is still not starting.
Then I tried to flash the firmware again. But this also doesn't work. My PC is not detecting the Duet. The VIN, 5V and 3.3V and Diag LED is on as soon I turn on VIN.
Looks like it is broken completely
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https://duet3d.dozuki.com/Wiki/What_to_do_if_your_Duet_won't_respond
How far along do you get?
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Already tried to do this. Already tried to erase everything but this also doesn't work
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Photos of the board? Maybe we can see a blown chip.
Checked fuses if present?
Do any chips get hot when connected to USB power and with the SD card removed?
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The fuses are okay. Already checked them. But as far I know the fuses are only for the power unit not for the programming interface.
Have to check if chip is gone. I also disconnected everything from the board but this doesn't make any difference.
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So I disassembled my other duet from another machine and changed it on my broken tool changer.
It looks like my duex5 is also brocken still the same Heater 5 and 6 not Controllable anymore.
I did some research that on the duex5 maybe the 74HCT02PW are broken. So I will replace this.
But how can I fix my Duet2? Or what can be broken?
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@smoki3 said in Bricked Duet2 SBC Ethernet:
I did some research that on the duex5 maybe the 74HCT02PW are broken. So I will replace this.
i'd test the mosfets first
if the 3.3v rail on the duet is good and the erase jumper doesn't help then make sure the issue isn't usb (port, cable, socket) related before replacing the cpu.
the usb port goes directly to the cpu and the bootloader is in rom so bricking usually requires damaging the cpu or usb connection.
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@bearer said in Bricked Duet2 SBC Ethernet:
@smoki3 said in Bricked Duet2 SBC Ethernet:
I did some research that on the duex5 maybe the 74HCT02PW are broken. So I will replace this.
i'd test the mosfets first
if the 3.3v rail on the duet is good and the erase jumper doesn't help then make sure the issue isn't usb (port, cable, socket) related before replacing the cpu.
the usb port goes directly to the cpu and the bootloader is in rom so bricking usually requires damaging the cpu or usb connection.
The to the fact that the two heater (heater 5 and 6) which are connected to U9 74HCT02PW both are powered on permanently I think the is not a mosfet failure. Unlikely that both fail at a time. I am pretty sure that the 74HCT02PW is broken.
So my usb equipment is fine tested with my other duet2 wifi.
Is it there a possiblity to flash the cpu via a serial connection to rewrite the bootloader?
I looked for the cpu, this costs around 30 euros to get it in germany. I think this is not economically
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So I managed to get the broken duex5 working again.
I desoldered the 74HCT02PW from the broken duet and placed it on the duex5. Now this is working again.
But I thing the duet2 is ready for the garbage.
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Was this a new Duet?
When and where was it purchased?
Do you suspect a possible short somewhere? -
@Phaedrux
No I use it for almost 2 years.
I am pretty sure that the CPU is gone
