Repaired Arduino mega 2560 recognized but can't communicate

Development Tools IDE 1.x
1

Hi all,

Since two days I'm trying to debug my Mega 2560 R3. I'm a beginner, but I read a lot of forum.
At first, I have to say that for an unknown reason, I fried the voltage regulator. I change it, now the ON light is lit.
Also the computer recognize the arduino in the device manager.

After the fix, the L led wasn't blinking anymore, so I used one of my Uno to reload the bootloader and the L led flashed again

Now I try to load a sketch and I see that the TX or RX led still off.

  • I tried to load sketch using my Uno on pin TX0, RX0, +5, gnd, reset, no luck
  • I tried to load sketch using my Uno on 2560 (pin 10 to 13 of Uno on 50 to 53 of the Mega), no luck
  • I tried to reload the firmware in the Atmega16U2, but I'm not able to put in DFU (short the 2 pins on USB ICSP doesn't change nothing)

So I'm not sure how to know if I fried something else.

Do the computer will recognize the mega if the Atmega16U2 is burned?
Is it possible to load sketch in the Mega using a Uno? (maybe I did something bad in my other test)

Thanks

Etienne

2

Note that the loop-back test doesn't works on my Mega but works on my Uno.
Note also that before to burn the voltage regulator, the Mega was working...