BillO:
1)Power the board from the USB cable only, jumper digital pin 13 to ground. The pins on the LMV328 should read as follows;
- Pin 1 ~ 0V
- Pin 2 ~ 3.3V
- Pin 3 ~ 0V
- Pin 4 ~ 0V
- Pin 5 ~ 0V
- Pin 6 ~ 0V
- Pin 7 ~ 0V
- Pin 8 ~ 5V
- Does the 16U2 get hot at all?
-
- Pin 1 = 107mV
- Pin 2 = 3.27V
- Pin 3 = 2.1V
- Pin 4 = 0V
- Pin 5 = 0V
- Pin 6 = 90mV
- Pin 7 = 90mV
- Pin 8 = 4.67V
- Nop, 16U2 doesn't get hot. Even with USB power, lmv358 becomes hot again, but it's at the limits to touch it by hand.
So, do you think that I need change mosfet and lmv358 or there is also something more to check?
If these 2 chips have problem, would this be the reason that 16U2 doesn't communicate with pc anymore?
Edit: I can hear the windows connected sound when I plug in the usb, but I can't see something at the device manager under com ports.
Do you think that I need reprogram the 16U2? Is there any way to read the code of this, to check with this way if the chip needs reprogramming or if it is finally damaged?