Check D3 and D4 for shorts, and R67 and R64 for open circuits. You can remove any shorted diodes, and replace any open resistor with a wire link.
How do tell if D3 and D4 are shorted?
How do I tell if r67 and r64 are open circuits?
The only person who can help with that is fzabkar check this http://community.wd.com/t5/External-Drives-for-PC/connected-wrong-power-supply-to-3TB-WD-My-Book-Essential-any-way/td-p/837943 check his other posts or try sending him a PM.
Joe
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