hello everyone, I have wd80emzz-11b4fb0 that is completely dead after plugging 19v laptop adapter to it. it died within 5 minutes or so, not instantly.

-I found out that the diode on the right is shorted so I removed it and found out that its one side is melted. but still the drive won't work.

-if there is anything else wrong with PCB I think I can handle it, but if not I will take it to a pro.

any help and guidance is very much appreciated. Here are the photos:

https://imgur.com/a/3xXUR4E

If you simply remove the diode and short the fuse - the next time there is a power surge, all the magic smoke will come out of the board. And it will become completely useless...
Fuse - replace:

thanks for the reply. Just to see if it is working, I'm thinking about shorting the fuse and plugging it first. Would that be right move to make?

This is your PCB. You can do everything.

that's really not what I was asking. Just for testing purpose first, can I just short the fuse and connect it to SATA power?

Has removing the diode cleared the short at the diode's pads? If not, then the motor controller would be suspect.

_________________
A backup a day keeps DR away.

I totally missed that. yes the diode pads are still shorted

Check the smaller rectifier diode near the SATA connector. Perhaps you applied reverse polarity? That is, some 19V adaptors may have a negative centre pin. WD My Books are positive centre.

_________________
A backup a day keeps DR away.

is this it? if yes, that one is shorted.

I think the adapter's centre was positive

Yes, that's it. It should have survived, but it's OK to remove it.

_________________
A backup a day keeps DR away.

Maybe it's easier to remove "000" in the picture on the right and see where the short circuit is. At the top or bottom is "000".
Sorry.

I removed the rectifier diode. Now the short on TVS diode pad is gone, also short on rectifier diode is gone. Do you think it is okay to plug it now?

Replace the fuse and give it a try. I would first power up the board on its own and check the supply voltages.

_________________
A backup a day keeps DR away.

here are the readings, 12v is missing I think

You need to replace the 12V fuse before the readings will make any sense.

_________________
A backup a day keeps DR away.

oh right, I replaced the fuse now Im getting 12v on fuse and TVS diode pad. also preamp power is supplies are now 5v and -3v. I think now ready to plug the drive

any readings that are out of order? I kind of find it weird to see 17v and 19v

17V is probably the boost supply for the spindle motor and VCM servos. It is usually around 18V, so this would be OK.

-19V and +16V appear to be associated with the piezoactuator, but I'm not completely certain. They are normal in any case.

I don't know what the -1.7V supply does.

ISTM that you are good to go.

_________________
A backup a day keeps DR away.

thank you so much for your help sir, the drive works as intended.

one last question, I want to replace the diodes just for the sake of recycling this drive and make it reliable again. I took the fuse from this board, this was the only board, this was the only board I had laying around I'm so lucky, as you can see that it is missing. But the rectifier and TVS diode's sizes are kind of looking different here. Can I use those?

Yes, you can use those. The difference is probably in the power rating.

SMAJ12A -> 400W
SMBJ12A -> 600W
SMCJ12A -> 1500W

I don't understand why your Schottky rectifier failed. They are normally rated at 1A 40V. Perhaps yours was a 20V part.

_________________
A backup a day keeps DR away.