I'm looking for a PCB main board for a:

Barracuda 7200.9
500 Gbytes
Model: ST3500641A
Firmware: 3.AAH
Any help would be apreciated.
Here's a picture of the main board.

Why look for one... in your picture you already have one

pm me.

_________________
banned user

Hi,

Could you retake a bit better pics??? Need to be able to see the numbers on the PCB. The label and the 9 digit number and the numbers on the chip!!!

What's the symptom?

What did you do, if anything, to damage the original board?

It was in a NAS Box, so it was just sitting there running. One day I rebooted it because it's not showing in my network and it wouldn't turn back on. No lights no fan spinning no plates spinning. So i took the hard drive out and I was going to get my files out before I send it in for repair, when I plug it in PC, my PC won't turn on, I hear a little fizzing sound like your frying something for a second and it would stop so I turn off the power supply and turn back on to try again and it does the exact same thing. I checked all the cables making sure everything is plugged in and tried turning it back on with the same result. So I unplugged the HDD and tried to turn on PC and it came back on. Thats all I did so far.

Your HD has a short circuit, probably on the +12V input.

If you have a multimeter, set it to the 200 ohms range and measure the resistances of the two TVS diodes near the power connector. If one measures zero ohms, then desolder it or snip it out with side cutters. The drive will run quite happily without it, albeit without protection on the affected supply rail. Just be sure your power supply can be trusted.

See the following article for help in identifying the components:

http://hddscan.com/doc/HDD_from_inside.html

The NAS has extended warranty and I don't wan't to damage the PCD so i can send it in, I just need another PCB so I can get my stuff out of the drive. The NAS is dead too so I have to send it in regardless.

A straight PCB swap may not work.

You will probably need to transplant the 8-pin serial EEPROM chip from patient to donor. It stores calibration data determined at the factory.

The easiest thing to do is to desolder one side of the TVS diode and lift it away from the pad. Then retrieve your data, and resolder the diode.

fzabkar

I was looking at the link you posted and i'm a little confuse.. the link shows 2 TVS and mine looks like it has three.. I checked with multimeter at 200OHM and the biggest one on the left is showing .5 and the other two are showing numbers then back to zero.

Those diodes are connected between a voltage source and GND. And in case of overvoltage, they short that very voltage supply to GND to save the rest of the circuit.

That means to find the TVS that actually burnt through, just check resistances to ground of both solder contacts on each TVS. Each TVS is soldered in on both ends, i.e. 2 solder contacts per TVS. Now the shorted ones will show a resistance near ZERO (for example 0.7) Ohms to GND on both ends and the ones that are still OK will show near ZERO Ohms on one and MUCH higher resistance numbers on the other end.

Remove the one on the left. I'm not sure what the third part is, but it could be a capacitor.

If you can read the markings on the parts, let us know.

the one on the left says AF53 PT..the one in middle doesnt have anything.. one on the right says 23L58..i attached the picture of the board..i think i forgot last time

Sorry, I can't find a datasheet for those marking codes. Anyway, the part on the left appears to made by Fairchild who do make SMBJ series (600W) TVS diodes. Remove it and you should hopefully be OK.

Good luck.

Ok, clipped that IC, it worked, only problem is windows won't read the format the HDD is on...the NAS is also shot...its a Maxtor Fusion 500gb .. is there any way of extracting the files or having windows read the disk?

I suspect that the NAS may be using a Linux file system.

The following utility will allow you to mount a Linux partition in Windows.

Open source ext2/ext3 file system driver for Windows (NT/2K/XP/VISTA, X86/AMD64):
http://www.ext2fsd.com/

I also found the following article.

Mount Linux file system on Windows operating system:
http://www.networknet.nl/apps/wp/archiv ... ft/windows

The author suggests a tool called Explore2fs which gives you read-only access:
http://www.chrysocome.net/explore2fs

"Explore2fs is a GUI explorer tool for accessing ext2 and ext3 filesystems. It runs under all versions of Windows and can read almost any ext2 and ext3 filesystem."

The above is probably the safest option, since you don't want Windows to write on your Linux volume (or do you?).

Alternatively, if you want to have full read-write access, then install Ext2fs.sys, a "pure kernel mode file system driver which actually extends the Windows NT/2000/XP/Vista (x86/x64) operating system to include the Ext2 file system".

http://www.fs-driver.org/download.html

This will most likely NOT have EXT/3.

Also, while running drive with no TVS may work in many cases, you can never be certain without the relevant checks that there is no internal damage to preamp or heads which is a possibility.

Good job pinoyxprss, but I think while you were OK in this case, the next newbie with this fault might not be.

@fzabkar - If you are going to encourage inexperienced novices, to attempt repair/recovery of crucial data at least make them aware of ALL the risks associated. User was lucky here, but any kind of mechanical/physical work required always has an equal chance of failure as it does success, sometimes more chance of failure.

thnx for the concern.. but i was totally aware of the risk.. i just didnt want anyone else to see what in the HDD before i send it in.. at least deleting the entire HDD was my last option

If only other data recovery professionals were so concerned. Some just want to sell you a board, others will tell you to search the archives for "TVS". Period.

BTW, if you had purchased a board, you would have had to desolder the 8-pin serial EEPROM chip from the patient and transplant it to the donor. That's much riskier than just snipping a protection diode.

As for which file system is on your drive, you can use Microsoft's Sector Inspector utility to capture the "MBR, Partition Table(s) and Volume Boot Records":

http://www.users.on.net/~fzabkar/SecInspect.zip

Extract the above archive to the one folder and execute the SIrun.bat file. The procedure will generate a report file named SIout.txt which you can then upload to a file sharing service so that we can examine it.

Seagate's download page suggests that the Maxtor Fusion is based on open source software from Fabrik Inc:
http://www.seagate.com/ww/v/index.jsp?l ... 04090aRCRD

Unfortunately the URL has expired:
http://www.fabrikinc.com/opensource/