Hi - I'm having the same problem with my UNO R4 Minima. When it's plugged in, the processor gets hot. I haven't even coded anything into it yet, it's still just programmed to blink its LED on and off. Even after about 1 second of being plugged in - the processor is warm. It works like normal, still distributing power, LED blinking properly, but after use, I let it cool down for a little bit before touching the processor. Any ideas on why it's doing this?
P.S. USB-C and 6-24V (I'm using 12V) power cable give me the same result.
Hi @kailagamer_2012. This might be caused by a short or external circuitry connected to the Arduino board drawing excessive current.
Make sure the board is not sitting on anything conductive that could short the contacts on the bottom of the board. Inspect the board carefully on both sides to make sure there isn't any conductive debris (e.g., strands of wire or component leads) on the board or on the surface the board is sitting on.
If you have a shield or any external circuitry or components connected to your Arduino board, try this experiment:
Disconnect the USB cable of the Arduino board from your computer.
Disconnect any shields, modules, external circuitry, etc. from your board.
Connect the Arduino board to your computer with a USB cable.
Now check to see if the problem still occurs.
This experiment will determine whether the problem was caused by the external circuitry. If so, you can then focus your attention on identifying the specific problem with the circuit and resolving it.
Cross-posting is against the Arduino forum rules. The reason is that duplicate posts can waste the time of the people trying to help. Someone might spend a lot of time investigating and writing a detailed answer on one topic, without knowing that someone else already did the same in the other topic.
Repeated cross-posting can result in a suspension from the forum.
In the future, please only create one topic for each distinct subject matter. This is basic forum etiquette, as explained in the "How to get the best out of this forum" guide. It contains a lot of other useful information. Please read it.
Sorry, forgot this post existed - The board had a plastic shielding around it when it came out of the box, and it has not been taken off. How would it be shorting anything?
P.S. Even when nothing is connected, it still does the same thing - gets hot.
Fair point. The plastic tray does prevent the board from being shorted out by resting on a conductive surface. It also makes it unlikely that it could be shorted out from conductive objects below (though it is theoretically possible that they could ingress through the holes in the tray). However, the board could still be shorted out from conductive debris on the top of the board.
The problem is probably caused by the Arduino board having suffered permanent physical damage. I recommend you carefully review what you were doing with the board the last time it was in a working state. You may be able to identify the cause of the damage and in this way profit from the mishap by gaining knowledge that will allow you to avoid subjecting boards to the same conditions in the future.
Unless you have the right tools on hand and the skills to use those tools, repair of the board will not be feasible. I suggest you attach a note to the damaged board describing what is wrong with it and put it in your electronics salvage bin. Then purchase a replacement board.
You can support the work Arduino does to provide free open source software, documentation, and hardware designs to the community by purchasing official hardware. It is available from these sources:
