Missing component in HD pcb

[xose_maria]

Hi!

I want to repair this board but this mosfet (circle) is missing. Pcb Maxtor DiamondMax 21 hard drive model STM3160215A

Thank you

Attachments

[data-medics]

Looks like the motor controller is missing too. Why waste time fixing a PCB that is so cheap to buy on ebay?

[xose_maria]

I know. I want to solder mosfet and chip controller. I don't know the name of the mosfet.

Thank you.

[fzabkar]

I believe that an Si4833DY or equivalent should do the job. The MOSFET appears to be the chopper for the negative regulator for the preamp.

The following PCB appears to have a similar circuit in that area.

Seagate Barracuda 7200.10 ST3320620A hires PCB photos:
http://www.hddoracle.com/viewtopic.php? ... =111&p=129

Examples of Negative Switchmode Regulators:
http://www.hddoracle.com/viewtopic.php?f=59&t=231&p=596

[xose_maria]

As always, very nice information.
Thanks!