Hello folks,

I have been busy. Now i wanna give a feedback to my previous question.

After reading you guys's suggestion. I decided to resolder the diode
which came from another new harddisc.

And it works out, which means the diode does protect the circuit
afterward, of course my friend has to sacrifice her new harddisc.

I have no idea what kind of type diode can be used. I suggested her to
look after a used one on ebay, so that her new one can be "repaired"
as well.
For now she is more than happy for having her baby photos again.
Thanks for your guys.



On 19 Nov., 01:10, kony <s...@spam.com> wrote:
> On Tue, 18 Nov 2008 13:23:57 -0800 (PST), "borat.gunter"
>
> <borat.gun...@googlemail.com> wrote:
> >I have asked my friend to take a picture. will follow up
> >But I am curious about the schematic part of such circuit. How does
> >the subcirciut work. No only in oder to fix it, more like the
> >principle.
> >I was thinking that the burn component were a fuse-like thing, which
> >would be sacrificed in order to protect the parts behind.
>
> >After discussing with my co-worker I think the hardware vendor would
> >pay more attention or effort on fuse-like component, since the
> >connector alone is really hard enough to connecte in the reverse way
> >which my friend did. I can't do that on my pc ;-(
>
> >Any schematic reference would be really helpful.
> >Thanks
>
> On a hard drive, such a diode would typically be used right
> after the power socket for polarity protection, or in a
> power regulation circuit along with a transitor(s) and
> inductor. *Either way, "IF" the diode has failed it is
> usually a sign that far too much current has passed to parts
> beyond it in the circuit.
>
> If you don't have the proper physical size or surface
> mounted replacement diode, you could probably find something
> with leads at a local electronics shop or repair center, or
> cannibalize a randon switching PSU (like a wall wart brick
> style) to get a suitable diode with leads and tack it down,
> soldered onto the PCB temporarily just to see if the drive
> works at all... but I would hook it up alone to a worthless
> old computer power supply, not in a valuable system and not
> with the data cable connected for the first attempt to see
> if it starts smoking or popping chips... the PSU itself may
> not even be able to turn on or really I mean stay on because
> of the drive being too badly damaged.