RE: TMC2300-IOT-REF - Remote controlled Stepper Motor - A closer look

Gough Lui — Wed, 10 Feb 2021 22:25:25 GMT

Hmm ... one connection on the SMD resistor just north of the TMC2300x has a suspicious blobby solder joint. I doubt it's the cause of the issue although that would (in my experience) increase the likelihood of it being a faulty joint, but it looks somehow inconsistent with the quality of the other solder joints.

- Gough

RE: TMC2300-IOT-REF - Remote controlled Stepper Motor - A closer look

Jan Cumps — Wed, 10 Feb 2021 21:18:00 GMT

Andy, I read that your power circuit gets hot, no matter what's connected as source or load.

If it gets hot even when there's no motor attached, that's a real sign that things are wrong.

These are all low power components without "prior state" memory. No component on the board can cause overheating without the motor.

Troubleshooting should focus on finding what components are defect.

The only easy test is to remove D6 and D8. If the board still gets hot, you know it's on the easy part.

But if not, you'll have to troubleshoot the ICs downstream the diodes.

The bad part is that it's most likely downstream, and those are more difficult components to troubleshoot.

The good part is that you have the UART kit, and the downstream components can be stolen from that ...