Need help identifying TVS diode

[killerbeez]

Ok so I've worked in the computer industry for over ten years but this is my first time actually modifying a hard drive pcb to try and get it to work so I feel very dumb in a field i normally feel very smart in lol. So, I plug the hard drive into an external source and the power light will blink, so it's lead to me believe it may be the tvs diode. (only judging from what I've been reading) I've attached pics of the board, which ones should I test?

thanks for helping a noob!!!

Attachments

[northwind]

Bottom left corner of the second pic (when you open it), what happened to that diode there?

[michael chiklis]

Bottom left corner of the second pic (when you open it), what happened to that diode there?

[killerbeez]

It's the foam stuck to it that goes between the drive and the pcb, ive peeled it off now would you like another pic? thanks for your input here

[bos]

If a TVS is burned you can (and should) most likely use your nose to find it. However, I cannot see any indication of burn marks on the PCB.

What makes you think it's a TVS?

Does the drive spin-up, make any noise at all?

[dick]

To check a tvs you just need to use a multimeter. Usually you select diode test. If it shows a short (continuity) in both directions then it is faulty and needs removing. After removal check the pads on the pcb to make sure the short circuit has been removed. At this point it would be possible to use the board without a tvs fitted but my advice would be to replace it from a donor drive before powering on. Good luck!

[northwind]

After removing the foam, does the diode look burnt or...?

You should use a multimeter and do what dick says on those two diodes there.