Short circuit on arduino r4 wifi HELP!

Official Hardware Classic UNO R4 WiFi
1

I just had an unusual accident: I wanted to test my research station connected to the IoT cloud, so I plugged the 12V power supply into the socket and something crackled slightly. But I didn't take that into account and plugged the other end into the Arduino Uno R4 WiFi. And at that moment, one of the micro elements crackled on the Arduino - it made a sound, smoke appeared, flashed slightly and started to smell like burnt components. I immediately unplugged it, waited a moment and connected it to the power bank. And then the Arduino turned on correctly and the sensors worked correctly. When I made sure that the board hadn't burned out completely, I opened the documentation and noticed that this element is called "NLASB3157DFT2G Multiplexer". I don't know if it's dangerous that it burned out, so I'm waiting for an answer from someone who knows more about it than me.
I'm attaching photos of the board and the power supply and screenshots from the documentation to the post. And I'll also point out - the board is still working correctly (probably) after this incident. However, I'll also mention that 2 sensors and an RGB led strip were connected to the board during the short circuit. The sensors work but the leds don't. I'll point out that this strip may not be working for this reason, but it's a bit strange because it was working 3 minutes before the incident.

I am waiting for your reply and best regards:)

Photo:

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EDIT: After many tests it turns out that the board looks and works visually but the USB port does not work and does not connect to the computer. Is there anything that can be done about this?

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2

And I'll add: I've used this charger for Arduino 5 times before and there was no problem before👍

3

Measure the adapter's output now. And if you've got a scope, check the output for ripple. My first wag would be that it's not putting out nice clean 12VDC anymore.

4

right, I'll check tomorrow. but I'd like to know if I can use any 12V power supplies now after the short circuit or now without it, only via USB-C

5

I wouldn't.

1 Like
6

If it started smoking it's likely cooked. I would replace it just in case.

7

Definitely that one part. However, the system seems to work but the serial port does not make contact.