"I didn’t set any encryption key with the SmartWare tool, but I guess it has a sort of encryption anyway, right?
So the pcb board on the hard disk can’t work without its original sata/usb board… "
> Spot on!
“Did I burn something on this board too, plugging it into a 19v power supply?”
There is very good possibility!
“Trying the hard disk with a sata/usb board from a different MyBook (2TB usb 3.0 as opposed to 1TB usb 2.0), I had no success.”
“If I buy a new MyBook (same version as the one I’m trying to recover the data from, ESSENTIAL 1TB usb 2.0) and I set no encryption key on this too, and use the new sata/usb board with the old hard disk, is there any possibility that I will be able to access to the data?”
Bad idea - Will not work - Initio Chip is your enemy.
IMO, I believe your drive electronics and interface card gone bad. If you really need your data recoverd, you need to contact WD approved Data Recovery agents from WD support site. This may cost you lot of money.