A few days ago, I smelled magical smoke, but couldn't pinpoint the source. Now when trying to 3D print something, Octoprint wouldn't respond, and I soon found that the stepdown powering the RPi 4 running Octoprint had burned out. Assuming that was where the smell came from.
No idea if the stepdown failed and took the Pi with it, or if the Pi failed and took the stepdown with it.
Measuring resistance between ground and the 5V line on the Pi, I get 0.2 ohms, more or less a full short.
There's no visible damage to the RPi, checked the circuitry around the power input port under the microscope. See attached overview images, I've been closer when inspecting it. The stepdown was good for 5 amps, one would think that 5*5 = 25 watts would leave some traces, at least if the Pi failed and took the stepdown with it.
Before starting to desolder components and testing them one by one, I'd love to know if some components are more likely to fail than others. Maybe someone here got that kind knowledge of the RPi 4, or any other tips for troubleshooting this?
Regrettably I've got no thermal imaging camera, so powering the Pi with limited current and looking for hotspots is out of the question.
No idea if the stepdown failed and took the Pi with it, or if the Pi failed and took the stepdown with it.
Measuring resistance between ground and the 5V line on the Pi, I get 0.2 ohms, more or less a full short.
There's no visible damage to the RPi, checked the circuitry around the power input port under the microscope. See attached overview images, I've been closer when inspecting it. The stepdown was good for 5 amps, one would think that 5*5 = 25 watts would leave some traces, at least if the Pi failed and took the stepdown with it.
Before starting to desolder components and testing them one by one, I'd love to know if some components are more likely to fail than others. Maybe someone here got that kind knowledge of the RPi 4, or any other tips for troubleshooting this?
Regrettably I've got no thermal imaging camera, so powering the Pi with limited current and looking for hotspots is out of the question.
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