Northwind is correct, seen many occasions where bad preamp still allowed WD drives to spin.

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Yes, but without a working pre-amp the drive would click, as the heads wouldn't be finding the servo marks.
Maybe i didn't express myself correctly but my point was intended to sum the fact that if the pre-amp were to be afected by the destroyed spindle controler chip, the drive with a donor pcb would either not spin at all or would produce clicking sounds.

The words "shorted" and "bad" cannot be used interchangeably. They do not mean the same thing. All shorted preamps are bad, but not all bad preamps are shorted. Those who are unfamiliar with electronics will often erroneously use the term "shorted" as a catchall to refer to any electronic fault. In fact "shorted" is the abbreviated form of "short circuited". A short circuit exists when there is a path of zero resistance between two points.

In the present context I believe "shorted" was intended to describe a specific fault where there is a short circuit between ground and one of the preamp's supply rails. Are you and northwind both suggesting that a perfectly functional PCB will still spin up a drive if a short circuit exists on one of the preamp's supply rails?

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You wrote ...


Seems perfectly clear to me ...

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Yes, I meant diode not transistor. And yes, I do know the difference.

Definitely have to replace the PCB, that motor control chip looks toast.

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Yes, this is what I believe to be true.

If the pre-amp is "shorted" or in other words if one of the pre-amp supply rails have 0 resistance to the passage of current with "ground" then not only the drive shouldn't spin as there is the possibility of PCB damage if the PCB is not conceived with a protection circuit to handle this fault.
I might be wrong but I do think the drive would be unable to spin with a SHORTED pre-amp the same way a computer power supply will shut down with a shorted power line with ground, like when a TVS on a drive or dvd unit gets damage and shorts the power line with ground.
I maintain what I stated, please clarify if you think that I'm wrong and if you think that the drive would spin with a shorted (not just damaged) pre-amp without insulating the contacts of the head stack with the pcb.

Hello, new update :

I managed to find a new donor pcb, the same as the original, code 2060-771624-003; for my western digital black 2tb.

I connected it up to the damaged drive and when I powered up my computer I thought for a short while that it was a perfect
match because the BIOS on my gigabyte PC recognised the damaged drive and my OS C drive too.

unfortunately, the damaged drive spins quietly for maybe 7-10 seconds; but then there is a light click ...click ...click...click.

So it seems like there maybe a preamp issue as many people have mentioned before.

Darn it. ;.)

However, I am glad I tried to fix the drive and thanks to everyone for all the great help and information.
Hard drive manufacturers would never be this good to a customer as you all have been.

This doesn't make sense.

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hi thanks for your reply : )

After it started clicking, maybe 10 clicks,perhaps? just after it was recognised and went past bios. I decided to turn the pc off. I did not let it go to windows because I feared damage may occur to the drive. i think i read somewhere that the ticking can cause damage to the heads. and so I posted on here instead.

it was a light 'ticking' sound , not a more heavier 'click' sound. the drive was confused , but it did not have the original rom.
it was just the donor board with no modification. a WD black 2tb

.


Why you have not original ROM?

Hi.

The original rom is on the original damaged board awaiting a transfer.

I first tested the donor board to see if the HD would spin up. it does but it ticks. : /

That is normal.
What is not normal is your drive clicking due to not-native ROM and at the same time being recognized with correct model and capacity by the bios.

Anyways, as I have said, I think this drive has damaged preamp as well, but maybe I'm wrong.

Good luck!

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then, you need to make rom transfer.

Thank you for your responses.

I would like to try an electronic transfer of the original ROM to a donor board ( none soldering transfer)

Spildit said he was able to do this electronic style transfer, so i shall wait for a response.

thanks again everyone : )

you can read Original ROM and write to donnor ROM chip but you need i/o tools

teerp where are you from?
I can do too the rom transfer, i have eprom programmer to do this.

I can also rebuild rom adaptives from SA if rom is embedded into MCU chip, i have many tools to do this (WD Doctor, WDR, Sediv)

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Hello Michael.

Member 'Spildit' said he would a have a go for me , but he seems not to be around on the forum now? I hope he is o.k, as he seemed to be a regular at one point.

How much do you charge for an electronic transfer? (I prefer not to do a solder transfer)

I am in England and have a donor pcb.

Thank you.

teerp : )

I'll do it for you.

PM me

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Hi Spildit , i have just promised the job to Michael Chiklis as I thought you may have been too busy or unable to see the messages. but please see my PM reply thanks!! : )

I received your pcb today, here your rom backup:


I have wrote it to donor pcb, tomorrow i ship to you.

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