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Topic: I think I destroyed my SMD Uno (Read 8368 times) previous topic - next topic

John_S

If you've got nothing to lose, I would try replacing the chip.

Put it in a toaster oven on high. It takes 5 minutes in the oven I use. 

Once the solder is loose, carefully take the board out. It helps if it's on a tray in the oven. You don't want to bump it against anything, everything will be loose. Using tweezers, pick off the '328. Allow the board to cool.

Using a fine point soldering iron, solder on a new chip. Lots of tutorials on youtube on doing smd soldering by hand.

I havn't done this technique on a Uno yet, but I have done it on a breakout board when I got the chip on backwards. Standard disclaimers apply.

nickgammon


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?


Thanks! I think it is leadless. As in this photo:



However that is not the photo of it. (That has the extra pads). The broken one has a chip the size of the lower one (SMD edition) but that particular rev board did not have the larger pads. I don't have my camera handy right now.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

nickgammon


what happens when using usb/arduino IDE? 


The IDE serial monitor will talk to the USB chip if you set up the loop-back test.

However an attempt to use the bootloader times out. As does an attempt to access it via the ICSP header.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

nickgammon


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


I think I must have zapped it with static. I usually touch my aluminum keyboard before reaching for parts like that, but might have forgotten once. Sometimes I get quite a zap from the keyboard when I touch it.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

CrossRoads

I've done in a couple - loose 12v wire hits a pin, and its dead.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

nickgammon


The TQFP chips, not the leadless chips - board looks like it has pads for both?


This is the exact chip:


Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

CrossRoads

Well that's different - leadlless only (-MU package).
Website shows that chip, but also has pads for the TQFP.
Could probably replace that too, I don't have any in that package tho.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

nickgammon


Well that's different - leadlless only (-MU package).
Website shows that chip, but also has pads for the TQFP.
Could probably replace that too, I don't have any in that package tho.


Don't worry. By the time I paid for postage to send it, and you posted it back, and bought the chip, and spent an hour soldering, it would be cheaper just to buy a replacement board. Plus I can still use it as a USB to serial converter. Not such a useless thing to have.

Thanks for the offer though.
Please post technical questions on the forum, not by personal message. Thanks!

More info: http://www.gammon.com.au/electronics

JChristensen

Haven't tried it myself, have you seen this stuff called "Chip Quik"?

CrossRoads

#24
Nov 11, 2012, 12:35 am Last Edit: Nov 11, 2012, 12:38 am by CrossRoads Reason: 1
Huh.
http://www.emulation.com/046/?gclid=CKW-kJzIxbMCFSXNOgodxwUAAg

Requested a sample.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

pico


Don't worry. By the time I paid for postage to send it, and you posted it back, and bought the chip, and spent an hour soldering, it would be cheaper just to buy a replacement board. Plus I can still use it as a USB to serial converter. Not such a useless thing to have.


Well I've got an Uno with a blown 8U2 chip. I can program it via ICSP, but USB comms of any kind is a total no-go. I think I buggered it up trying to reprogram the 8U2, and left the fuses in an uncooperative state. In any case, Avrdude advises it ain't saying nothing...

So between us we've got a working Uno! (Maybe they are now actually "metas", technically speaking?)
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