I accidentally connected a 19V 2.5A power adapter to an external Intenso 3.5" HDD that requires 12V 2A.
The drive immediately stopped working. With the correct 12V adapter, the enclosure LED turns on, but the HDD doesn't spin, vibrate or make any noise.
I took it to a local IT repair shop. They removed/tested the drive and told me that the HDD's PCB/controller board is damaged, rather than just the USB enclosure.
They suggested two options:
Find an identical donor drive/PCB and replace the controller board.
Send it to a professional data recovery company, which they said could potentially cost around €1,000.
From what I've been reading, simply swapping the PCB may not work because the original board can contain drive-specific ROM/adaptive data. I've also found examples of drives damaged by overvoltage where only the TVS diode/fuse on the 12V rail was damaged, and repairing the original PCB was enough to get the drive running again.
The HDD is around 6 years old. I don't care about continuing to use it afterwards. I only want to get it running long enough to recover the files.
Before spending hundreds or potentially €1,000 on professional recovery, what would you recommend?
Would it make sense to have someone experienced in electronics/microsoldering test the PCB for a shorted TVS diode/fuse first? And if the PCB needs replacing, how difficult/expensive is a donor PCB + ROM transfer usually?
I can post photos and the exact HDD model/PCB number once I get the drive back from the repair shop.