TX RX constantly on: Dead FTDI?

Forum 2005-2010 (read only) Hardware Troubleshooting
1

TX RX LEDs are constantly ON in my arduino: this means a Dead FTDI?

I didn't do anything yesterday was working perfectly the only thing I do is to change the power source to an 9V 1A power source and then back to USB 5V

2

please I need help!

3

Doesn't sound too inspiring!

Perhaps you can try connecting to your Arduino through pin 0 and 1 over a standard serial?

4

the only thing I do is to change the power source to an 9V 1A power source

where did you put this 9V power to 5V or to Vin?
If in the 5V then you probably killed something.
The LEDs (which I assume you are seeing as ON) are connected to the USB serial chip so that might be dead but the signals come from PIN 0 and 1 (through a 1K) so if these are low they will be on also.
Thinking about it the RX signal comes FROM the USB chip so that is the most likely candidate.

5

thanks, I removed the ftdi and light went off

I didn't really now what produced this behavior

I did put the 9V in the 9v connector (dc adaptor)

6

Reversed polarity on the 9v adapter perhaps? Had you ever used that specific adapter before?

7

You got it! this adapter has an interchangeable head with polarity denoted by a "tip" mark. Can a reverse polarity killed the ftdi only?

8

Can a reverse polarity killed the ftdi only

Yep it can kill anything but the ftdi being only a 3v3 device and having a smaller technology (the physical size of the gates) is probably a bit more vulnerable that the Arduino.

9

Thanks

10

It was a faulty FTDI.

I have replaced the dead ftdi with a brand new from Seeedstudio and my decimilla back to life!