wd80emzz-11b4fb0 won't even spin after 19v adapter

[Pandemicc]

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

[SWM]

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:

Attachments

[Pandemicc]

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?

Attachments

[SWM]

This is your PCB. You can do everything.

[Pandemicc]

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?

[fzabkar]

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

[Pandemicc]

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

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

[fzabkar]

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.

[Pandemicc]

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.

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

I think the adapter's centre was positive

Attachments

[fzabkar]

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

[SWM]

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.

[Pandemicc]

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

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?

[fzabkar]

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

Attachments

[Pandemicc]

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

here are the readings, 12v is missing I think

Attachments

[fzabkar]

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

[Pandemicc]

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

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

[Pandemicc]

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

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

Attachments

[fzabkar]

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.

[Pandemicc]

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.

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?

Attachments

[fzabkar]

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.