Repairing 12tb WD pcb after connecting a dodgy molex to sata conector

I’ve got a few dead hdd’s after setting up a NAS in an old pc and connecting them with a dodgy molex to sata connector. 2 HGST and 2 WD (WD120EMAZ, WD120EDBZ) that have the same pcb (004-0B41714)

Looking around online and at replies from @fzabkar, it looks like they might be fixable either by a pcb swap and transfer the bios chips, or replacing the dead components on the broken pcb. So first I’m thinking to try repairing the pcb’s.

The data on the drives wasn’t important, although it was the main copy and the backup, so if I get the data back it will be a bonus.

So far looking at one drive (WD120EMAZ) there is no visible damage on the PCB, but measuring continuity on the board it looks like this fuse is blown. So I’m hoping it might be just a case of replacing that, and the same on the other disks

The question is can anyone advise what fuse that is? and if they can be purchased on there own? or if it is better to get a replacement pcb and take the components from that?
Also what other components might be damaged that would be easy to check before going further?

I don’t have an electronics background so I’m learning as I go. I like trying to fix things when they break. So I’m going to get an SMD Soldering practice board and some relatively cheap soldering gear to try that first and see how much harder it is than it looks.

Any pointers would be greatly appreciated.

Thanks

Hi @davee1
Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:

I have not opened a support case, but thanks I will try that

That would normally be a 4A fast fuse.

Sorry for my late response. This forum is swamped with spam, and the mods, who are probably just AI bots, don’t give a rat’s.

riyan_shaik, are you a real moderator or are you just an AI bot? If you are a real WD employee, why have you done nothing to rid this community of the constant deluge of spam? Do you not care about WD’s reputation?

Thanks for the response @fzabkar , that’s exactly what I needed to know!
Looks very similar to this https://uk.farnell.com/bourns/sf-0603f400-2/fuse-smd-4a-0603-fast-acting/dp/2291899 .

No problem for the late reply, I haven’t had the spare time to get started on it yet.
riyan_shaik is probably a bot, the support response what that its against their policy to provide that type of information

Yes, good luck.

Thanks, I had some spare time to try it the other week. All 4 drives are working again now. Thanks again for the advice

Now that you are back online, I suggest some replacement disks as the existing ones may be damaged in other ways

I use JBOD USB-C boxes which are cheap and get the job done