Pardon for my english...

The damage was already done. That's why the fuse was open.

At the moment you cannot tell which component is responsible for the low resistance. That's why you need to remove the zero-ohm resistors one by one.

Personally I would backup the contents of IC602, if you can. The data in this chip are critical and must not be damaged. At the very least I would refrain from powering up your board again.

There are suppliers who will provide a PCB plus "ROM" transfer for US$50. You might like to consider that option as well.

Edit: I would test the resistances of the motor windings.

_________________
A backup a day keeps DR away.

Excuse me, which is the role off the zero resistances, i' not be able to backup the content if the ic. If a buy a pcb with the same serial? The fisical drive i hope is good? I burned this hdd when i connected it on a chineese led projector with a supplementary alimentation from a laptop. I burned projector, hdd and laptop mainboard. great error.

which is the role of the zero resistor?

I burned hdd connecting to a chineese led projector. It was not enough power and I put a additional power from a laptop . Result : burned hdd , projector and laptop motherboard.
That mistake!
If a buy same pcb (same serial) and replace the old, i' m not able to backup ic firmware?

I sent other posts but were moderate. Maybe because of my bad English . Anyway thanks.

Zero-ohm resistors are sometimes used in place of fusible resistors, but most often they are simply used to link two points on a circuit board. The manufacturer could populate the same location with an inductor or a fuse, but the resistor is cheaper.

PCB protection devices:
http://www.hddoracle.com/viewtopic.php?f=100&t=1615

_________________
A backup a day keeps DR away.

Yes but because two zero ohm resistor in parallel?

I can see one of your other posts. I don't know why it hasn't appeared in your thread. AIUI, you connected your drive to a Chinese LED projector. The projector wasn't able to provide sufficient power, so you supplied additional power from a laptop. The result was a burned HDD, projector and laptop motherboard.

As you have discovered, you should never combine the outputs of two or more different PSUs ... unless they have been specifically designed for this purpose.

_________________
A backup a day keeps DR away.

They are not in parallel.

_________________
A backup a day keeps DR away.

Thanks.

In summary :
1. I need to save the data of my IC602 . An identical pcb does not solve my problem. Can you tell me a site where i can buy the " ROM Transfer" ?
2. Then I can continue troubleshooting. But ...
What steps follow? Removing the zero ohm resistors that audits should I do ? Which capacitor in place of the lost ?
3. If the PCB is broken irreversibly I have to buy one just like it and transfer the data of the IC602. .

if I move my ic602 on the new PCB? it's risky? To be exact my hdd is a toshiba mk5065gsx A0 / Gj003a .

hdd-parts.com offers a PCB + firmware transfer for US$50. One forum member will sometimes do it for less.

I doubt that your PCB is economically repairable.

That said, the capacitor would probably not need to be replaced. It simply filters the 5V supply.

After removing the resistors, measure the resistance between ground and the right pad of each resistor.

_________________
A backup a day keeps DR away.

This forum member?

It's me. I can provide board for less.

Thanks to the availability.
I thought , before repairing the pcb I would be sure that the hdd spins.
How can I test it ?
I have to apply voltage on which of the 4 pin connector on pcb ?

You cannot get the motor to spin by simply applying a DC voltage to the pins. The motor has three phases which must be commutated, ie pulsed in the correct order. The best you can do is to test the resistance of each winding with a multimeter.

_________________
A backup a day keeps DR away.

The resistance between the first two points is 3,5 ohms and 5.5 ohms between the other two. (three phasis?)
Are they good values ​​?

Phase-to-common resistance should be half the phase-to-phase resistance. Your measurements look about right, but I suspect that the zero point of your meter is around 1.5 ohms.

In short, it looks OK to me.

_________________
A backup a day keeps DR away.

Ok Thanks, I think it's worth trying the replacement of PCB .