2060-701590-000 rev a unknown fault ?!

[raven4d]

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

Attachments

[hddguy]

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.

[raven4d]

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 ...

[fzabkar]

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.

[raven4d]

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 ..

[zzccsyd]

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

[fzabkar]

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

[namhdeh]

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

[fzabkar]

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