Hello, yesterday i was experimenting with my arduino and i accidentally touched with 12V1.5A the digital pin 2 for a second on my Arduino Uno r3
the code that i was trying works but i cant send new code on my Arduino
i tried removing the atmega328 chip, shorter tx-rx pins and tried to send something on the serial monitor to get it back but nothing happens, the tx-rx led's are not working, i tried another atmega328 chip but still nothing
is the MEGA16U2 chip dead? also if i buy an arduino compatible board and switch the chips is there any chance that it will work?
(update) i tried now to upload the blink example with a cp2102 usb to serial and it worked, tried the pin2 with a led and that worked too
The 16U2 is in the MUR package. It is the hardest solder-able component on the board, by my opinion. If you are able to do this, you can replace any. I have some experience in this area and I would prefer to buy another board. It is cheaper.
EDIT: I didn't want to discourage you, sorry if yes. You cannot loose at this moment if you try to replace it.
If you are sure that you touched only pin 2 with 12V it could be just 16U2 (I don't understand why the 16U2 is a victim and not 328P? It is Tx pin.).
If you decide nevertheless to replace 16U2, it could be useful to read this topic: Share tips you have come across, #301, how to protect plastic parts like headers which are near around.
hello, i got a genuine mega 2560 for free with some damage in the chip next to the crystal (LMV358IDGKR) and windows cant recognize (error 43) and i remembered that i forgot to write here that windows recognize the arduino uno and when i click the Tools>Get board info on Arduino IDE it returns board info so still the damage might be on the MEGA16U2 chip or somewhere else?
I have yet to hear of anyone successfully repairing a board with damaged 16u2; I've read at least two reports of people replacing it, but finding that after doing so, it still doesn't work!
More than one chip may be damaged (possibly in a way that trashes the new 16u2 if you don't fix it first). The '358 is pretty fragile, and will mess up the power switching if damaged (which would provide a possible route towards damaging newly installed 16u2's)
This is one thing in favor of ch340g based clones - I don't think I've read a single report on here that was consistent with a damaged ch340g, compared to dozens of threads on damaged 16u2-based boards.
Budvar10:
The err. 43 can be caused by damaged driver. Try to reinstall driver.
the chip next to the crystal overheats and when i desoldered it the MEGA16u2 was overheating
DrAzzy:
I have yet to hear of anyone successfully repairing a board with damaged 16u2; I've read at least two reports of people replacing it, but finding that after doing so, it still doesn't work!
More than one chip may be damaged (possibly in a way that trashes the new 16u2 if you don't fix it first). The '358 is pretty fragile, and will mess up the power switching if damaged (which would provide a possible route towards damaging newly installed 16u2's)
This is one thing in favor of ch340g based clones - I don't think I've read a single report on here that was consistent with a damaged ch340g, compared to dozens of threads on damaged 16u2-based boards.
so its better to just program it with an usb to serial?