Hi,
yesterday my arduino mega2560 (clone) stopped communicating t trought usb. Only ON and L leds are glowing, however arduino is ok because the last uploaded sketch is working. I thought that 16u2 was dead so I tried everything according to this tutorial http://arduino.cc/en/Hacking/Upgrading16U2Due. I was using my original arduino UNO as ISP programmer
I got this message from cmd:
So I think that when I was able to upload new firmware (I uploaded Arduino-COMBINED-dfu-usbserial-atmega16u2-Mega2560-Rev3.hex from arduino folder) the chip should be ok, am I right? But I am still not able to get the chip to DFU mode by shortening those 2 pins from 16u2 ISP connector.
I can,t see the device mega2560 in control panel at all.
My question is if the 16u2 is dead or not or where else could be the problem.
Thank for replies. I dont know if flashing helped but I got it working however I think that the problem is in broken USB connector on arduino. I tried several cables and its working only sometimes with one cable but only in a particular position. So 16u2 has to be ok. I will try to change the usb connecotr.