Help Duet Wifi cannot connect with USB
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Found a post with a fairly similar issue https://forum.duet3d.com/topic/5864/usb-connection-failed
I am just wondering now if the problem can be reproduced by plugging in a (PC connected) micro USB while the board is on and powered from a power supply?
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@ms232 maybe a ground loop killed the USB port on the board as explained here https://duet3d.dozuki.com/Wiki/USB_ground_loops
My question now is if it's only the USB port that is damaged or more components and if it's viable to repair?
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@ms232 the power input is working from the usb port (5V) what's not happening is any 3.3V power which indicates the 3.3v regulator is damaged. Depending on how it was damaged, it may have prevented anything damaging the 3.3v ICs or not.
Do you have the facilities to replace the 3.3V regulator or an external source of 3.3V power?
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@t3p3tony I have few buck converters i can use one of them to dial down DC power to 3.3V with the help of a multimeter but where would i connect that on the board afterword? looking at the wiring diagram i can se an optional EXT 5V next to the Power in but cant locate an 3.3V in.
For the 3.3v regulator if i know the the location of the component i may be able to replace it , i have a decent soldering iron with fine tips and a heat gun.
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@t3p3tony I have no clue what i am looking for but have to ask : is it this ? :
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@ms232 yes!
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@t3p3tony Excellent, I used the multimeter to measure Vin to GND and it read 4.69V while the board was powered only by USB and measured Vout to GND and it had a very small fluctuating value like 4 to 1 mv so i will order a new TC2117 hopefully will find a supplier who doesn't require a minimum order of a 1000 units. fingers crossed that this is the only damaged part. will report back.
Thank you so much for your help I can only imaging how busy you are.
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Update: Found and ordered TC2117-3.3VDBTR
from mouser.com -
@ms232 said in Help Duet Wifi cannot connect with USB:
Update: Found and ordered TC2117-3.3VDBTR
from mouser.comPlease note, the part number and pinout of the 3.3V regulator was changed in a recent PCB revision. So please make sure that you have ordered the correct part for your PCB.
Edit. You said in an earlier post that the board is rev 1.04, so that one is not the right part.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 According to this
https://github.com/T3P3/Duet/blob/master/Duet2/Duet2v1.04/DuetWifi_Schematic_v1.04.pdfits : AP7361c-33E-13
https://www.mouser.com/ProductDetail/Diodes-Incorporated/AP7361C-33E-13?qs=%2Fha2pyFadugKLjPGv%252b5YwrOyXTiNyKrfVmndilGmr48wnNJYzX5UPw%3D%3Dis that correct?
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Yes, that's the correct part for the rev 1.04 board. Be sure to get exactly the right one, because there is also a variant of that part with an extra R in the number, signifying a different pinout.
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Received the part this afternoon and just now soldered it, had to use the heat gun to remove the burned regulator, and tested it with a windows laptop with only USB powering the board, I heard the familiar tone that windows make when you connect a device and saw the wifi and the 3.3V led turned on, also checked the browser and it connected and showed the web GUI fine.
Now I am connecting everything back together to print an XYZ calibration cube before I celebrate. thank you, Tony and dc42 for all your help. -
Calibration cube printed fine but working without a z-probe for now as I don't know what happened to the Bl-touch and don't want to take any chances if it has a short.
Back to printing. thank you again.
