I successfully soldered a JTAG connector to an Element 14 rev C board on my first attempt and I am by no means a pro with a soldering iron. I placed a small amount of solder on the bottom side of the connector first. Then I held the connector in place with a clamp so that there was pad showing off the end of each foot of the connector. I had my soldering iron hot enough to melt the solder in less than a second. I also dabbed on extra solder quite liberally at the toe of each foot onto the exposed pad. I removed the clamp after the first couple o pins so that I could get at the pins better. Then used solder wick to remove all the excess solder. There were at least 3 places with solid bridges. I inspected with 20x magnification. Then removed the tiny bridges I didn't see before with more solder wick. Cleaned up with isopropyl alcohol. It's not exactly pretty but worked on the first try.
Later tonight I can tell you the exact solder I was using and the temperature I had my soldering iron set to. Sent from my iPhone > On Mar 23, 2015, at 12:32 AM, Claud Xiao <[email protected]> wrote: > > Hi, > > I tried to solder ARM20cTI20 JTAG connectors with Element14’s BBB but failed, > twice (hence two boards broken). After some investigations, I think it’s not > my fault but is manufacturer’s problem. Element14’s version and CircuitCo’s > version are really different in this issue. > > As you may know, BBB hasn’t JTAG interface on board unless you manually > solder an extra ARM20cTI20 connector to its P2. There’re some tutorials on > how to do that: > http://www.tincantools.com/wiki/Flyswatter2_BeagleBone_Black_How_To > https://www.youtube.com/watch?v=7JmHn7aN2FU > > I have lot of experiences in soldering and never failed before. But this time > is different. Although I strictly followed these tutorials, no matter how > long I keep the soldering iron on the connector’s pins to heat adherent > solder, the solder on the pin will never glue with the P2. I tried many times > and some other methods (even with different kinds of solder irons) but > stilled no success. I also tried to directly paste some solder to P2 but it’s > pretty hard to adhere to. Some solder even became sphere other than adhere > the bottom pins. Anyway, now two boards’ P2 were destroyed while two > ARM20cTI20 connectors was consumed away. > > After carefully compare images/video in tutorials with the boards I have, I > found the main difference is, there isn’t any solder covered P2 pins in my > boards. > > Let’s take a look at Adafruit’s pictures on BBB: > CircuitCo’s version: http://www.adafruit.com/products/1876 (out of stock) > Element14’s version: http://www.adafruit.com/products/1996 > > And in SeeedStudio: > CircuitCo’s version: > http://www.seeedstudio.com/depot/BeagleBone-Black-p-1505.html (not rev C) > Element14’s version: > http://www.seeedstudio.com/depot/Embest-BeagleBone-Black-RevC-Singleboard-Computer-p-1860.html > > Take a look at P2 on the back of the board. There’s a huge difference that > CircuitCo’s P2 pins are covered by solder while Element14’s are not. Note > that all tutorials used CircuitCo’s version. I also highly doubt Element14’s > pins are covered by some solder mask which prevent the solder’s adherent. > > My question is, > > 1) Is there anyone who successfully soldered it on Element14’s BBB before? If > you are, how do you achieve that? > > 2) Is there any way to buy CircuitCo’s BBB rev C? At least Amazon, Adafruit, > SeeedStudio, Sparkfun are not. MakerShed’s picture is CircuitCo’s but it > hasn’t any manufacturer information. Consider that Sparkfun’s picture is also > CircuitCo’s but their products are Element14’s, I don’t think picture is > trustworthy. > > Thanks your guys! > - Claud > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
