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[on:]

I have a SMD Edition Uno. It used to work. It no longer accepts uploads.

• I tried the loop-back test. Passed.
• The +5V and +3.3V pins read correctly.
• The "on" LED lights up.
• Attempts to program it via ISP fail with "unable to enter programming mode"

The SMD processor chip will be difficult or impossible for me to remove and replace. Any suggestions? Or just throw it into the bin?

I suppose it could be retained as a USB to serial converter.

[Reply #1 on:]

Were you previously able to program it via ISP?

[Reply #2 on:]

Yes, previously it worked normally.

[Reply #3 on:]

Any idea what might have happened to it? I accidentally programmed the RSTDISBL fuse bit recently. That slowed the whole process right down.

[Reply #4 on:]

I suspect static electricity. I'm usually careful but maybe I picked it up when I had a charge.

[Reply #5 on:]

Do you have a high-voltage programmer?  (Maybe the static discharge flipped the RSTDISBL fuse bit?)

What did you last upload to it?  Does that program still run?

[Reply #6 on:]

Do you have a high-voltage programmer?  (Maybe the static discharge flipped the RSTDISBL fuse bit?)

I do, but I don't think I can program it without removing the chip. Or can I? Atmel warn against attempting that with chips on boards, but maybe it would be OK. I suppose it couldn't get any worse.

[Reply #7 on:]

What did you last upload to it?  Does that program still run?

I'm not sure. I do so much ad-hoc testing of stuff for the forum it could be practically anything.

[Reply #8 on:]

I'm not sure. I do so much ad-hoc testing of stuff for the forum it could be practically anything.

From compiling stuff for the forum, I have already killed one of my dip based ATmegas.  Maybe you burned up a flash cell (or two)...

[Reply #9 on:]

Do you have a high-voltage programmer?  (Maybe the static discharge flipped the RSTDISBL fuse bit?)

I do, but I don't think I can program it without removing the chip. Or can I?

I forgot about the stuff connected to RESET.  The Atmega16U2 may not survive the 12 volts or the auto-reset circuit may interfere.

Good news!  (and very bad)  You have a new oversized USB-to-TTL-serial converter.

[Reply #10 on:]

Ah well. At about the same time my USBtinyISP stopped working. Not a good day.

[Reply #11 on:]

Nick,
I can replace that chip for you. I have a hot air station, and even a couple of chips I think.
The TQFP chips, not the leadless chips - board looks like it has pads for both?

[Reply #12 on:]

what happens when using usb/arduino IDE? 

[Reply #13 on:]

Need to fill out that question some more cjdelphi, you are mixing things together a bit too much.

[Reply #14 on:]

I'm curious how on earth he killed one, i've tried (by accident) several times lol