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:
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.
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,
Is there anyone who successfully soldered it on Element14’s BBB before? If you are, how do you achieve that?
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!