hello ;

i have a
wd5000aads-00l4b1

that doesn't spin up at all .
pcb# 2060-701590-000 rev a
sticker # 2061-701590-j00 ad

when testing a close donor PCB
pcb# 2060-701590-000 rev a
sticker # 2061-701590-b00 ac

the drive spins with expected clicks due to FW .

any way , the original rom can't be read (mcu problems? )

the patient PCB doesn't show any kind of damage , and comparing the readings between the patient and the donor PCB returned exactly the same values except for
d2
patient 0-0
donor 5.20 V -0

c2
patient 0-0
donor 5.20 V -0

q2 ( the marked leg only , other readings are identical)
patient 1.90
donor 3.16


one idea is to fix the patient pcb as it doesn't look like it's totally down , other idea is to flush the donor pcb with several similar roms of the patient , till some one work ..


any help will be appreciated
thank you

Or hotswap it and read relevant modules for ROM restoration, or at the very least gain access to some overlay to identify SA/ROM version.

thank you for your idea , unfortionatly i couldn't find a full donor for it ...

If you are measuring +3.3V at the emitter of Q1, then this means that the Vio supply is OK.

If you are measuring +1.3V (or +1.2V ?) at L1 and L2, then the Vcore supply is OK.

The voltage at D2/C2 is the -5V supply for the preamp. AIUI, this supply needs to be switched on by the MCU. Therefore it would appear that the MCU may be dead.

_________________
A backup a day keeps DR away.

thank you all for your efforts ..

a respected member sent me the rom of an exact match HDD , i flushed it to my donor pcb and all went good and drive is up again ..

Hi raven4d.. I have exactly problem with . i replaced D4 and D3, but still doesn't spin. can you please show me how to flush it? Thank you in advance.

PCB 2060-701590-000 REV A

@zzccsyd, you won't be able to "flush" anything if the board is dead. What voltages are you measuring?

_________________
A backup a day keeps DR away.

Hello, anyone can tell me what are the reference or caractéristique of diode 4 of the pcb? thanks a lot

It's a 12V TVS diode, eg SMBJ12A.

See http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html

Datasheets for 12V TVS diodes:
http://www.vishay.com/docs/88406/tpsmb.pdf
http://www.st.com/web/en/resource/techn ... 001366.pdf
http://www.diodes.com/datasheets/ds19002.pdf

_________________
A backup a day keeps DR away.