[SOLVED] WD400 PCB replacement ?

[racachaquero]

Hello, I recently toasted the PCB from an old hard drive by mistake, and now I'm looking for the right replacement.

My drive
========

MDL: WD400BB-00JHC0
DATE: 12 SEP 2005
DCM: HSBHYTJCH
WD P/N: WD400BB-00JHC0

(Silkscreen text)
PCB: 2060-701292-000 REV. A

Little sticker near the Molex connector reads:
2061-701292-000 AN XC 2D42 0B4Z 8 0007100 6107

Donor
=====

MDL: WD400BB-23JHC0
DATE: 13 MAR 2005
DCM: HSBANTJCA

(Silkscreen text)
PCB: 2060-701292-000 REV. A
Little sticker near the Molex connector reads:
2061-701292-000 AG XW 2033 UNWX 9 0006370 5376


Note that the donor has the same exact PCB silkscreen text as my drive, but the sticker near the Molex has a different letter (AG vs. AN), and the rest is different too, (I don't know if this part is important, what is it?)
The donor also a different DCM and while mine is 00JHC0, this one is 23JHC0. The dates are also very different (6 months apart).

So would this one be a good replacement board?
I'd appreciate very much your help as I'm doing this for the first time

Cheers

 

[Colif]

thread moved, I also removed the duplicate post.

 

[racachaquero]

thread moved, I also removed the duplicate post.

Thanks!

 

[fzabkar]

You need to transfer the "ROM" chip from patient to donor. This company will include the transfer in the price.

https://www.hdd-parts.com/12103552.html

Check the TVS diodes (D5 and D6). If the 5V diode is shorted, or if the motor controller chip (SMOOTH) is burnt, then there is a real possibility that the preamp on the headstack has been damaged.

 

[racachaquero]

Hi, I already have removed and dumped the contents of the ROM chip just in case.

My question is about my possible donor PCB. Does it look ok?
The PCB version and revision match, but the part number of the disk is slightly different.

The link you posted has a different PCB version number, by the way.

What's more important, the part number or the PCB version and revision numbers?

 

[fzabkar]

In general, the minor revision numbers don't affect compatibility. Sometimes the RAM capacity may differ between PCBs, in which case moving to a smaller RAM capacity may render the donor PCB incompatible. Different model numbers in the same family will normally be compatible, after a ROM transfer.

Edit:

If you upload your ROM dump, I could verify its checksums.

 

[racachaquero]

In general, the minor revision numbers don't affect compatibility. Sometimes the RAM capacity may differ between PCBs, in which case moving to a smaller RAM capacity may render the donor PCB incompatible. Different model numbers in the same family will normally be compatible, after a ROM transfer.

Edit:

If you upload your ROM dump, I could verify its checksums.

Great! Here's the ROM dump
I didn't know where to upload it, I hope this is ok.
Thank you

 

[fzabkar]

Everything is OK.

http://www.users.on.net/~fzabkar/HDD/WD400BB/Flash_01.7z

 

[racachaquero]

Everything is OK.

http://www.users.on.net/~fzabkar/HDD/WD400BB/Flash_01.7z

Excellent, thank you!

As soon as I get that PCB we'll see how it goes...

 

[fzabkar]

If you get no help for your preamp measurements at HDD Guru, I'll help you locate the test points. You'll need a multimeter.

 

[racachaquero]

Finally I got the PCB, re-checked the number, replaced the EEPROM... and boom, we're in! 🆒

Thank you very much for your guidance and help fzabkar!