Have been using this drive for backup and suddenly it fails to operate,no motor noise,nothing, when I monitor the 5 volt input the current is 115 ma and never changes, I have another drive with identical looking board but it is 60 gb instead of the 30 gb capacity of my bad one, can I swap boards and get the motor operating again? (the good one draws up to 650 ma and settles around 160 ma idle current.)
I have a semi clean work area and have been repairing gps receivers for the last 14 years so I am familiar with surface mount tactics and esd safety.

You can swap the board just to check if motor for the other one spins, but not to recover data.
In that case, you would have to match not only model, but FW as well to get a compatible board, or then swap ROM chip.