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    U3 Buck ruptured? Admin please advise~

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    • kungpaoshiziundefined
      kungpaoshizi @dc42
      last edited by kungpaoshizi

      @dc42 So I received the 2nd board. It too is a 4403T if I'm seeing that correctly. Again, firmware 2.02, gcode setup via RepRap configurator stable version. I even went through today and verified the gcode necessary for the BLTouch.

      I hook up everything except the BLtouch, everything is good. Printer functions etc.

      I hooked up the BLtouch, and quickly turned the machine off because it seems to exhibit the same behavior.

      The sequence is:
      No BLTouch connected, power flips on, all power led's instantly light up, wifi led does it's thing.
      When BLTouch connected, power flips on, VIN led lights up, and other power led's don't light, or are dim.

      At this point I'm afraid it's going to fry U3 again, but I have it correctly hooked up according to the pictures.
      Zprobe= White|Black|blank|blank and then to the expansion port, pin1 red pin2 ground/brown pin8(or heater3) yellow/orange

      Now at first the BLTouch is set to 5.5v, it's the October 2017 BLTouch Smart 2.0 https://docs.wixstatic.com/ugd/f5a1c8_ae578955f18f4a02ba55fd1bc0d1fd7d.pdf

      I even scratched the back to separate logic and make it 3.3v, but it's still not working seems to power up now though.

      I ordered a new BLTouch that should be here tomorrow, but the one I have is genuine, and worked the morning of original installation.

      Please advise. Board seems fine, but I'm afraid to leave it on with power led's exhibiting the same behavior prior to the roast. I assume power led's should instantly light up with every power on?

      elmoretundefined dc42undefined 2 Replies Last reply Reply Quote 0
      • elmoretundefined
        elmoret @kungpaoshizi
        last edited by

        @kungpaoshizi "I assume power led's should instantly light up with every power on?" - Yes

        1 Reply Last reply Reply Quote 1
        • kungpaoshiziundefined
          kungpaoshizi
          last edited by kungpaoshizi

          This post is deleted!
          1 Reply Last reply Reply Quote 0
          • kungpaoshiziundefined
            kungpaoshizi
            last edited by kungpaoshizi

            M122
            === Diagnostics ===
            RepRapFirmware for Duet 2 WiFi/Ethernet version 2.02(RTOS) running on Duet WiFi 1.02 or later
            Board ID: 08DGM-917DA-G4MSD-6J1F6-3S86P-99U7A
            Used output buffers: 3 of 20 (14 max)
            === RTOS ===
            Static ram: 25524
            Dynamic ram: 98832 of which 0 recycled
            Exception stack ram used: 344
            Never used ram: 6372
            Tasks: NETWORK(ready,544) HEAT(blocked,1232) MAIN(running,3788) IDLE(ready,200)
            Owned mutexes: WiFi(NETWORK)
            === Platform ===
            Last reset 00:24:27 ago, cause: software
            Last software reset at 2019-03-09 04:31, reason: User, spinning module GCodes, available RAM 6332 bytes (slot 1)
            Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0xffffffff Task 0x4e49414d
            Error status: 0
            Free file entries: 10
            SD card 0 detected, interface speed: 20.0MBytes/sec
            SD card longest block write time: 0.0ms, max retries 0
            MCU temperature: min 29.7, current 30.3, max 31.1
            Supply voltage: min 11.8, current 12.2, max 12.5, under voltage events: 0, over voltage events: 0, power good: yes
            Driver 0: standstill, SG min/max not available
            Driver 1: standstill, SG min/max not available
            Driver 2: standstill, SG min/max not available
            Driver 3: standstill, SG min/max not available
            Driver 4: standstill, SG min/max not available
            Date/time: 2019-03-09 04:55:43
            Cache data hit count 4294967295
            Slowest loop: 5.45ms; fastest: 0.07ms
            I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0
            === Move ===
            Hiccups: 0, StepErrors: 0, LaErrors: 0, FreeDm: 240, MinFreeDm: 238, MaxWait: 1129814ms, Underruns: 0, 0
            Scheduled moves: 13, completed moves: 13
            Bed compensation in use: none
            Bed probe heights: 0.000 0.000 0.000 0.000 0.000
            === Heat ===
            Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1
            Heater 0 is on, I-accum = 0.2
            Heater 1 is on, I-accum = 0.4
            === GCodes ===
            Segments left: 0
            Stack records: 1 allocated, 0 in use
            Movement lock held by null
            http is idle in state(s) 0
            telnet is idle in state(s) 0
            file is idle in state(s) 0
            serial is idle in state(s) 0
            aux is idle in state(s) 0
            daemon is idle in state(s) 0
            queue is idle in state(s) 0
            autopause is idle in state(s) 0
            Code queue is empty.
            === Network ===
            Slowest loop: 14.33ms; fastest: 0.00ms
            Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0) Telnet(0)
            HTTP sessions: 1 of 8

            • WiFi -
              Network state is running
              WiFi module is connected to access point
              Failed messages: pending 0, notready 0, noresp 0
              WiFi firmware version 1.21
              WiFi Vcc 3.34, reset reason Turned on by main processor
              WiFi flash size 4194304, free heap 14776
              WiFi IP address 192.168.1.229
              WiFi signal strength -48dBm, reconnections 0, sleep mode modem
              Socket states: 0 0 0 0 0 0 0 0
            1 Reply Last reply Reply Quote 0
            • kungpaoshiziundefined
              kungpaoshizi @dc42
              last edited by kungpaoshizi

              @dc42 44031-1747-686L btw I think, hard to read, apologies for not posting earlier

              1 Reply Last reply Reply Quote 0
              • dc42undefined
                dc42 administrators @kungpaoshizi
                last edited by dc42

                @kungpaoshizi said in U3 Buck ruptured? Admin please advise~:

                No BLTouch connected, power flips on, all power led's instantly light up, wifi led does it's thing.
                When BLTouch connected, power flips on, VIN led lights up, and other power led's don't light, or are dim.

                It sounds that your BLTouch is shorting out the 5V supply. This could either mean that it is faulty, or that then +5V and ground wires have been connected the wrong way round either now or in the past.

                My current theory about these U3 failures is that they are triggered by a combination of the Duet VIN being at or above the maximum allowed (25V) and the load on the 5V supply being abnormally high. So please don't power that BLTouch from the Duet using VIN power as long as it is shorting out the 5V rail.

                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

                kungpaoshiziundefined 1 Reply Last reply Reply Quote 0
                • kungpaoshiziundefined
                  kungpaoshizi @dc42
                  last edited by

                  @dc42 Well, here's a pickle for ya. After unplugging and plugging the bltouch to the board multiple times, everything started working.
                  After receiving the new bltouch, everything worked for it too.
                  My first thought was maybe the 5v pin on the expansion port was loose, but it's not turned off the bltouch at all since it started working.

                  I've printed more than 20-30 hours so far, turned the unit on/off many times. The only thing I've not done yet is rehooked all the connections up. I'll be doing that soon though as I'm changing psu's and steppers.

                  I'll update further if I have anything happen. I will say awesome work. Truly awesome. The experience connecting to WiFi and transitioning between machines via web page has been flawless. Thank you sir! 🙂

                  1 Reply Last reply Reply Quote 0
                  • dc42undefined
                    dc42 administrators
                    last edited by dc42

                    I'm glad it's working. Is there any chance that a whisker from one of the BLTouch wires escaped the crimp and was shorting to the next pin? That's been known to happen before.

                    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

                    kungpaoshiziundefined 1 Reply Last reply Reply Quote 0
                    • kungpaoshiziundefined
                      kungpaoshizi @dc42
                      last edited by

                      @dc42 I checked everything very thoroughly when it wasn't working. I was pretty disappointed.

                      Even rechecked my crimps and that the contacts from the connectors were down inside the connectors enough.

                      1 Reply Last reply Reply Quote 0
                      • RandyL00123undefined
                        RandyL00123
                        last edited by

                        I have this issue. My bltouch got covered in plastic, and tore and shorted the wiring and my first hint of an issue was when this IC popped a hole in the top. I contacted AliExpress, and was told to go pound salt, as in their opinion, if it worked when they shipped it, it's my fault. I can't really argue with their logic, but why is there not a fuse to protect the IC from short circuits?

                        T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                        • T3P3Tonyundefined
                          T3P3Tony administrators @RandyL00123
                          last edited by

                          @randyl00123 did you get the board from AliExpress? There is a fuse on the Duet to protect that circuitry from fires, it won't necessarily act fast enough to protect circuitry from over voltage.

                          www.duet3d.com

                          1 Reply Last reply Reply Quote 0
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