HELP WANTED!

I found my lacie hdd dead with the usb casing suddenly, the casing power unit to usb was defective. IT housed a seagate sata drive. With repairing on of the tvs diodes the drive itself worked again, but now after another power surge when connecting and spinning up a chip cracked and burnt. Now it is really dead and not spinning up any more. Its a seagate 7200.10 320GB barracuda with firmware 3.aad made in China.

Cause its made under OEM restrictions i guess this drive is not under warranty. So i tried to find the exact drives and changing the logic boards.

I found and tested 2 same type of drives (320 gb 7200.10_ found here in the Netherlands, one made in Thailand the other one also made in China) but still problem: i cannot access data and worse BIOS does not!! recognize the drive (connected by usb). Though the drive spins up connected with both two differnt boards, one of Thailand with the same firmware version, there is no sign of recognition by BIOS or pc.

What to do now ? I was thinking of repairing the old board with the burnt chip, the same type i found only is one the Thai harddrive logic board.

Its marking starts with

4833
ssBN then a piramid
.w76c

So you still have data on there that you need to retrieve, or you want to repair this PCB which has now suffered two failures?

Also I would look into getting a new PSU that doesn't kill your drives...

_________________
You don't have to backup all of your files, just the ones you want to keep.

I'm not a DR guy, so I can't advise you on the matching of the boards, but even when replacing identical boards, you will need to transplant the 8-pin serial EEPROM chip (25P05VP) from patient to donor. This IC stores unique drive specific calibration data.

As for the burnt (?) part, it is a ...

Si4833DY P-Channel 30-V (D-S) MOSFET with Schottky Diode, SO-8:
http://www.vishay.com/docs/70796/70796.pdf

I suspect that it forms part of the negative voltage supply (-4V, -5V ???) for the preamp inside the HDA. Normally when this chip fails, you would need to test the preamp connector for short circuits on the preamp supply rails.

To help you identify the components, here are my scratchpad style notes:
http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt

Sorry to ruin the day but in this case is somehow useless (look CAREFULLY at the boards) and with much probability preamp is fried too (but this can or can't be).
To make things worse, if you know what to do, original PCB , ROM and all the family are NOT necessary to get data. But you should know HOW.

With the 2nd board does the drive at least spinup and stay on / perform at least some partial calibration ? This can sort out if HSA is at least showing sign of life.

There is one thing about both these boards if you change ROM on the other board you drive could work but very slow but you can get data of it.

You need a closer match on the part

Not true.

I feel that for somebody at this level it is true that it is the simplest way forward without the potential of ruining the drive. I am willing to concede that this is not the only way. Terminal speed transfers and risky procedures with firmware would be the last consideration surely?

Hint taken, please accept my apologies.

I don't understand what you mean. The OP was asking whether the two boards were functionally identical (obviously they are physically different). I said that I didn't know, and added that even physically identical boards would have differences in the EEPROM. Furthermore, I did not suggest that the OP swap EEPROMS between his two boards, although your colleague seems to be suggesting that this may be OK.

Are you referring to the date codes on the Si4833DY chip? :wink:

If so, then FYI here are the date codes of the various chips on the two boards.

W65C 622 2625 R623 629

W76C 730 9734Y 733 Y736 78A

Ok, thanks for the tips, but i am not sure to replace which eprom form the Thai drive to to Chinese one..... cause the partslayout on the Thai is different and as said before the whole print is different. Have to say that I examined another exact Chinese sata drive too, but it had totally different names on the chips and also the eproms. That's why i decided to take the Thai drive, cause it has (alsmost) the same chip that burnt.
Or should i get a better chine OEM drive? (I guess this is the best)

Anyway can someone at least tell me which eprom chip it is from the Thai seagate drive to replace to the Chine drive ?

Atmel622 or the E63N3S
25f512AN 2625
ch27


And is one of the same eprom, thus the with same pinout?? I would not like to destroy a working disk... beforehand...

CORRECTION it is not the E63N3S but the E6N3s 26.

If you wish to just swap the MOSFET, there is likely to be other damage but you can at least try.

I wouldn't swap the ROM personally because it would be a PITA to get the drive running and would require kit I presume you do not have, as well as knowledge that you will not find printed in any easy to follow guides on the net.

I hate the chinese production way, they make so many same electronic unrecognizable parts that blow up. The first blow up was from a poor and cheap, lacie housing wihtout cooling (!! very good for lifetime!) then an newly bought usb connector voltage psu blowup, then only the protection diode was blown, but later now its hard to find to right part even the exact same print and with parts layout (!!! even when made in China when you find an exact type there are different parts printlayout!!!) , cause they make different and unrecognizable parts for third party vendors (thus junk) for OEM vendors like LACIE, and who do NOT offer full warranties also!! Just to confuse people, so they sell more new waist in the world. I found many people who have exact the same problems with spinnin up, and burning parts of the same type nr!! SO this really pity for me and those who thought had a safe backup !!!

I want to know what the donor EPROM smd part on the Thai disk is for the Chinese eprom (as mentioned before) , see the pics above. And most wanted the pdf or other pinouts, so i can see it the pinout voltages are the same. If there is any to be find in the millions of type numbers...of smd parts..

SO JUST INFO PLS THAT I CAN USE

You still want to do it yourself ?

If (WHEN) he fails to get his data, he can write about it here and show the consequences of DIY...