FTDI troubleshooting

While working on an Arduino based project I was suddenly not able to upload sketches using an FTDI anymore. From one minute to another I received errors such as

avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

when trying to upload a sketch to an Arduino Pro Mini or Lilypad.

I checked several possible causes such as

 

But the error persisted. None of the possibles causes I checked was responsible.

With the tips in this forum entry I found out that my (original) FTDI chip was the problem, somehow the TX line went dead. Further tests on Linux confirmed this. How and why this happened is unclear.

My final solution? I had to buy a new one…

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