I think I may be in the same boat as Walker.
I have one of these boards hooked up to a rev B Pi (both purchased near the end of January). I've re-checked my soldering and made sure I have continuity from the board through a T-cobbler and back to the Pi. However I can't get i2cdetect -y 1 to show me an address.
- The green LED on the servo board lights when connected.
- I didn't think the servo power supply was needed but I've tried it both ways.
- I even attached an LED to SDA looking for activity. I get a quick flicker when I run i2cdetect.
I'm about to order an i2c LCD backpack to give that a try but ultimately need to get this sorted out.
Thanks for any help!