Arduino Uno Programmer not responding

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1

I know there're many posts related to this and there're many solutions provided in those posts already, but again I am posting this because none of those solutions works for me.

So, I have a Arduino Uno with the ATMEGA328p that I can't upload sketch onto, when I try to upload I get:

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00

I have tested the below:

  1. It worked before -- so something happened while it's being used, sadly I don't know when this issue starts to exist.
  2. My computer works with other Arduino uno boards, exactly the same model. I also tested the broken board with other computers in multiple platform (Mac, windows, ...) -- so it's not the IDE, it's the board
  3. The board passes the loopback test -- so it's not a hardware problem (or very unlikely, as the serial communication is still working, I assume)
  4. I tried burning new bootloader, the bootloader is burnt successfully -- so now I have no clues why it is still not working

The reason why I haven't put it to be recycled yet is it passed the loopback test, so I think the problem is somewhere in firmware/software and can be fixed. But I don't have any idea where to start investigating. Any idea on where the problem might be or where to start looking into is very appreciated.

Cheers,

2

Just making sure that nothing is connected to pins 0 and 1 :wink:

If that is indeed not the case and based on (3) and (4), I suspect a communication issue between the 16U2 and the 328P.

Check the schematic (https://docs.arduino.cc/resources/schematics/A000066-schematics.pdf) and measure the traces (resistance) from the 328P's Rx/Tx to the 16U2's Tx1/Rx1; you should get 1K. Also measure accidental connectivity to GND and Vcc.

3

Yes nothing is connected on the board.

I will have a look at the circuit, Thanks sterretje!

4

@john_cheung
Does the LED blink a few times when you push the reset button?

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5

It does, so I assume the 328p is working

6

It does, so I assume the 328p is working

The 328p and the bootloader

  1. loopback works
  2. bootloader is there and working

Then the only explanation I can think of for it not working is that the RX and TX pins on the 328 were somehow damaged.

7

Thanks a lot Jim! It turned out that The TX pin of the 328 is snapped in side the base.

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I think that is a first on this forum.
Glad you found the problem.
Have a nice day!

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