January 5, 2011
about 4 years ago
Before applying power, I was studying the backpack to make sure I understood which pin was which and ended up having to unsolder the screw terminal connector block to repair an open trace under the connector. There was no continuity from the 5V screw to the nearby 5V header pin, JP1 pin 5.
As a matter of fact, initially there was no continuity from the 5V screw to anywhere at all.
So, there were two problems, an open trace, for sure, to the header pin, and a bad solder connection from the screw terminal pin to its hole, so that the 5V trace that leads to the components was also not connected to the 5V screw. After fixing the open trace and resoldering the connector, the board powered up OK and works fine.
I use HyperTerminal to send the commands and control characters. Use the ALT key and numeric keypad or equivalent keyboard numeric keys.
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