ok,
White wire is now on the 'other' side of the onboard LED.
Device powered up with 5V
Resting - Black (0V) and White Wire 'other' = 4.9V
LED ON - Black (0V) and White Wire 'other' = 4.62V? I used a question mark here as I was sort of getting an average of this. Sometimes the reading didnt change from the 4.9v, but when it did, it usually went to 4.6v. Perhaps the LED flash is too fast for the DMM to recognise?
White wire is now on the 'other' side of the onboard LED.
Device powered up with 5V
Resting - Black (0V) and White Wire 'other' = 4.9V
LED ON - Black (0V) and White Wire 'other' = 4.62V? I used a question mark here as I was sort of getting an average of this. Sometimes the reading didnt change from the 4.9v, but when it did, it usually went to 4.6v. Perhaps the LED flash is too fast for the DMM to recognise?