[SOLVED] Water Damage on WD120EMFZ PCB 006-0B40385 What are these components?

[travisjwolf]

My watercooling loop sprung a leak in my unraid server. The only hard drive that was affected was my Parity drive. I removed the PCB and found moisture and corrosion on some components. One area left little burn marks on the blue sponge and I am trying to identify what they are, its hard to tell from any reference picture if there was anything actually soldered there besides solder dots. . Circled red in the picture. I have cleaned the PCB but have not tried to test it yet.

 

[fzabkar]

I suspect that the 12V TVS diode nearby may be the source of the burn marks. If it is shorted, then also check the small fuse nearest the SATA 12V power pins.

 

[travisjwolf]

Thanks fzabkar, can you help me understand what the fuse looks like? The picture I linked was a reference picture I found online. Here is a picture of my actual board. There are two tiny components that I believe burned up and left residue on the blue sponge separator. Is there risk of testing the board in its current state? Wondering if these are replaceable (if so where would I find replacements) and if not is there a guide to replace the PCB and transfer the ROM modules to the new board?

Thanks in advance!

 

[fzabkar]

Those locations look like they were unpopulated. Instead I'd be looking at "14" (12V TVS diode) and the tiny fuse (vertically mounted) above and to the left.

TVS Diode FAQ:
http://www.hddoracle.com/viewtopic.php?f=100&t=86