Hi Hdd Guru's
may someone can help me solve this problem. the drive doesn't spin up because
of the PCB. But when i swap the pcb it's looks good and trying to measure it's components
i found no problem.

may any one can help me ?

thanks anyway

sorry for my poor english

You need to swap the ROM also, when u change PCB.

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on this model of wd40 only ? is that right ?

I am not sure how you tested the PCB. If you put it on another drive and the other unit did not spin up, then you may have a blown motor IC or corrupted ROM.

If you put a good board on your bad drive and it didn't spin up, then check the motor for an open or short.

Jon

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thanks for replies. but now i'm sure that the motor IC is corrupted.

the question now is should i swap the ROM from the old PCB ?

Yes, if you use a different PCB.

No, if you repair the one you have by replacing the motor IC.

Jon

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thank u jon for ur advice. but i used to replace wd40 PCB without changing
ROM IC. EX : model : wd400eb - 11cpf0 ?

If you have an exact match PCB you do not have to change the ROM.
It is very difficult to find an exact match.
It is ease to find a close match and change ROM

thank u friends