Wrong power supply connected wd7500aavs

[fzabkar]

The usual result of such an overvoltage is a shorted 12V TVS diode (D4).

http://www.users.on.net/~fzabkar/HDD/bigcircuitboard_diodes.jpg

If R64 is OK (zero ohms), then removing D4 will usually recover the drive.

See http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

… and http://hddrepairing.com/downloads_n_videos/presentation/harddisk_pcb_repairing.pdf