Can't upload

Development Tools IDE 1.x
1

Hello all,

I had my arduino uno rev3 working good for many time but since yesterday I can't upload to the board. IDE found it in COM but uploading is stucking there forever. The arduino TX light never lit, only the RX is blinking when try to upload the code.

This happened after the latest code upload which involved previously an hardware change. The MS5611 sensor was added to the (already tested) SD shield, LLC and MAX31855 TC.

The 3.3v is used for the ms5611 and for the TC and are supplied directly from the arduino. The SD uses an dedicated LDO to provide the 3.3v.

LLC has 3.3v as LV and 5v as HV from the arduino and are connected to SDA, SCL, SPI CLK, SDO (4 channel LLC).

I noticed also that near the 16U2 chip (underside of the board) there were a bit more heat than usually.
The 3.3v supply still is working in the arduino board.

Since also the L led does not flash at power on, I suspect the bootloader of the atmega328 is corrupted?

Any ideas how to proceed/further diagnose?

Thank you

2

disconnect everything from pins 0/1

3

I suffered from the same some time back. I solved it by updating the drivers.

4

Pins 0/1 always disconnected.
I have tried using other pc and same problem. Also I have a spare arduino uno and works without problem.
Noticed that reset button does not do anything.

Tried yesterday to burn the bootloader and no success also...

Any ideas?