Having issues with Digital Channels and LEDs- hoping for power sequence for board v2.2

[jcollina]

We've been having trouble with the Digital In channels (a constant noise across all channels), and have also noticed that the LEDs were not consistently working. We suspect that this is a hardware issue with our board, and the production delays mean that we really hope we'll be able to track down the problem ourselves!

We noticed that the both the +5VD_1 testing pin and the 5VA testing pin weren't giving us 5V- they were giving us something significantly lower instead.

Does anybody know the power sequence for the acquisition board? For example, are the +5VD_1 and +5VA testing pins powered by the 5VA and 5VD regulators?

We're trying to track down the specific parts to replace, and we think we found that both of these regulators aren't giving us the right output, but aren't sure whether the next step is to replace the regulators (which, as far as I know, don't break easily, and are also out of stock) or whether this is just a sign that there's a problem elsewhere in the circuit.

Is this problem potentially the result of faulty regulators, or does anyone have other suggestions for the next step?

I've attached a screenshot of what the TTL channel noise looks like during a recording.

Thanks,
Jared