Got it figured! For some reason the thing won't run at under 4.2V I've been trying to run it at 3.0V - I might revert to the 628A as it's better at lower power - on saying that the datasheet for the 628 does say it will run at 3.0V Thanks for your time everyone, I should have bumped the voltage to 5 much earlier. Good suggestion too skimask about the prototype boards I've had trouble with mine in the past but for some reason i still trust them - figure that one out!