I'm not sure what happened with my Arduino Giga. I was troubleshooting some code and was uploading the new version of my code when suddenly the board went dead and everything turned off. There was no smoke, no sound, nothing (though on the previous iteration of code, the screen had an odd greenish tinge like someone had turned the green channel too high). I was powering the board on 12V on the VIN pin and connected to my computer on the USB-C if that make any difference, but my understanding is that the board switches to the VIN power when that is connected and just uses the USB for communication.
Does anyone have any idea what might have happened, how I can troubleshoot this, and if there are any ways to fix it? Or if there are any kind of warranties that I can try to claim (I ordered this board on Feb 12, 2025 and I am in Canada)? The board and display are expensive, and the green tinge on the screen makes me worried that I am looking at potentially having to replace both.
I'm not sure I understood correctly what you mean by this. By "everything", do you mean that even the "ON" LED on the GIGA R1 WiFi board turned off?
Here are a couple of experiments you can perform to troubleshoot:
Connect another USB device to the same USB socket (including the USB hub if you are using one) that you had the GIGA R1 WiFi connected to. Is your computer able to power and communicate with that device? If the result of the experiment is that the other device is also not functional, this would indicate a problem with the USB hardware of your computer (e.g., disabled due to trigger of short circuit/overload circuit).
If the result of that experiment is that the USB socket is functional, then you can proceed to perform this second experiment:
Disconnect the USB cable of the GIGA R1 WiFi from your computer.
Disconnect the GIGA Display Shield, as well as any other shields, modules, external circuitry, etc. from your board.
Connect the GIGA R1 WiFi to your computer with a USB cable.
When you do that, does the GIGA R1 WiFi board by itself work as expected?
If the result of the experiment is that the GIGA R1 WiFi board alone is functional, this would indicate that the problem is with the GIGA Display Shield, or other external circuitry that you previously had connected to the GIGA R1 WiFi.
Yes, the board completely stopped working and the ON LED was off. I had it powered with 12V on the VIN pin at the time that it stopped working. I disconnected the Display and I tried plugging the Giga into a different computer, and it didn't do anything.
I found some diagnostic procedures, and it looks like there might be an issue with the 3.3V power system. There is almost no resistance (0.9Ω) when I test the resistance between the 3.3V pin and ground (this is while unpowered). When I power the Giga with a USB, the 3.3V outputs only 0.5V. The only thing that I have running on the 3.3V system is the Display Shield, so I am not sure what happened.
As near as I can tell, the Display is fine, and the LED backlight comes on and draws ~200mA when powered with 3.3V, but I am leery of using it on a new board.
But had you been changing the wiring while it was powered up at any time?
This will damage the components and shorten the life considerably. So a failure does not always happen immediately, it takes time to show up. This will therefore look to you like a random failure, but it is evidence of past component abuse.
This is a meaningless measurement. You are just measuring the resistance of the ESP diodes. Any un-powered system will give you the same results.