Arduino UNO R3 Board not responding

I have an arduino uno r3 board,
atmega328p-pu = big chip,
mega16u2 = small chip
and am trying to connect to it with my pc (windows 10) , but uploading the bare minimum code produces this error;

Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
"C:\Users\JunaidUmar\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\JunaidUmar\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-PCOM9" -b115200 -D "-Uflash:w:C:\Users\JunaidUmar\AppData\Local\Temp\arduino-sketch-F5DEF372FBFE9B1B8DA9C0298E5B32B1/BareMinimum.ino.hex:i"

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "C:\Users\JunaidUmar\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"

         Using Port                    : COM9
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x56
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x56

avrdude done.  Thank you.

Failed uploading: uploading error: exit status 1

The device manager shows the port, and lists it as 'Arduino UNO (COM9) '
and the arduino shows the port when plugged in, disappearing when removed.

There are no connection on the board, just the usb cable.
when plugged in the ON light comes on and stays lit,
the L light comes on and stays on (not blinking)
when trying to upload the program the rx light blinks at each attempt out of 10

I have seen a post and followed the advice

theres a few similar ones that mention problem with the bootloader, but im not sure how to fix (i only have 1 board)

Did that board ever worked? can you try on another computer ?

the bootloader might indeed be damaged or absent but if you have only 1 arduino and no other way than the USB cable to explore there are not so many things you can do...

thanks for the reply

Damn, Yeah the board was working on the same computer yesterday, after that i connected it to the arduino shield relay board, and used a meter to measure voltage on connections, i doubt these things would damage the bootloader but im not too sure now
i will try a different pc to check,
i saw online uploading without bootloader is possible,
do you think it would be a good idea to just upload without the bootloader?

I don't think you can't do that through an USB cable connected to the USB port of your UNO

it takes sometimes just a fraction of a second to create a short circuit...

And now the UNO on its own gives this loading error?
Can you please post an image(s) of the shield plugged into the UNO, specifically from the USB socket end.

Tom.. :smiley: :+1: :coffee: :australia:

Hi Tom,


Hi,
Thanks for the pictures.
I was making sure the metal surround of the UNO USB socket does not short on any solder joints on the shield above.

I have found this is possible and can cause shorts.

Solution is to place a couple of layers of insulation tape on top of the USB socket to insulate it.

Thanks.. Tom.. :smiley: :+1: :coffee: :australia:

Hi Tom
thanks for the tip, I did get a piece of plastic with the relay that i tossed aside. i ll make sure to add it next time and double check for any possible shorts

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