Hello all

Here is the situation, by accident I plugged my laptop power supply into my external harddrive.
I estimate a three volt over charge which was enough to knockout the external.
When the right power supply was plugged in it just flashes. No sign of life from the drive.
Interestingly enough, the External Drive was branded Maxtor, but when I opened the enclosure up I was surprised to find the drive was actually a
Seagate ST3750640A 750GB 16MB Cache 7200RPM hard drive.
Anyway I tried plugging the now "internal" drive into an empty spot but I get nothing (saved
I noticed a scorched type smell coming (apparently) from the area of the PCB board on back.
So, what are you more knowledgable fellows thoughts of a PCB swap being good enough to
get me running again? I'm thinking even if it works to immediately transfer everything to another drive.
What are my risks? Any resources you should point me to? Or should just prepare to sell my first born to the data recovery people. Anything else you think will be useful please share
Thanks to All!
Warmly
Dick
PS Does anyone know of a PCB source other than buying a whole drive?
PSS keep in mind its a Seagate ST3750640A
not a Seagate ST3750640AS I figure that "S" makes a difference, anyone know what it means?
Thanks again!