Trouble with my Arduino Duemilanove

Forum 2005-2010 (read only) Hardware Troubleshooting
1

I have an Arduino Duemilanove. It was working fine. Then all of a sudden when I plug it into my computer via USB it is not recognized. I borrowed my friends Arduino Duemilanove(thanks DW) and his works fine on the same computer.

Since I have another unit to trouble shoot with, I tried swapping out the big chips. The same thing happens. My Arduino doesn't show up has a com port, but his does.

My arduino's power light comes on when I plug it in to the USB. The LED with the L flashes, but the TX/RX lights do nothing. It also seems to run sketches fine as well. My understanding is the surface mounted chip near the USB port is the chip responsible for the USB communication. Is it possible it is fried?

Does anyone have any suggestions?

If more info is needed please let me know. BTW this forum is great!

Thank you

2

I'd start by sending a note to the place you bought it to let them know you are having problems.

3

So, I asked the place where I bought the unit and they said to start a thread in the arduino.cc forum. Super fantastic!

Is there anything I can try?

4

How are you powering them?

Does your 168 chip work on the known good Duemilanove?

Can you post some high-res pictures for us to look at?

5

Sounds like a USB problem,
since the other board is working is your computer USB installation probably still correct.
This leaves us with the USB-serial interface chip IC2 FT232.

Try keeping your friends board and switching the 168 chips.

Magnus

6

I have swapped out the 168 chip and it worked in the know good board.

I was powering them off the USB.

I will post some pics.

7

Looks like your 168 chip is fine

Are the jumpers identical on both boards?

See if your board works with external power

:slight_smile: