www.deadharddrive.com

Dave@LDF4N6

I have a Hitachi Travelstar 2.5" drive,
http://ldf4n6.serveftp.net/images/IMG_1487.JPG

Model: HTS725025A9A361
Made In: Thailand
P/N: 0A73352
MLC: DA3247

The top 2 lines of the PCB are:
http://ldf4n6.serveftp.net/images/IMG_1488.JPG

0A71428
DA3005A

I ran diagnostics on the drive using an Atola. I need a donar PCB and
maybe a head stack replacement as well. After some research it
appears that many of the new Hitachi drives store adaptives and other
information in the NVRAM stored on the PCB which will need to be moved
from the original PCB to the donar.

I'm not sure how to identify the NVRAM chip. Research I've come
across says the NVRAM chip is an 8-post chip and may be the U3 or U6
chip. Other information says its the U5. Can someone identify and tell me how they identified the NVRAM Chip on my PCB?
http://ldf4n6.serveftp.net/images/IMG_1491.JPG
http://ldf4n6.serveftp.net/images/IMG_1493.JPG

Also, I'm looking for a donar drive if anyone has one for sale.

Kit · Deadharddrive regular +2 Joined: 10 Nov 2008 Posts: 56

one chip is rom, another is nv-ram. You need move both to donor pcb.

Kit · Deadharddrive regular +2 Joined: 10 Nov 2008 Posts: 56

one chip is rom, another is nv-ram. You need move both to donor pcb.

Dave@LDF4N6 · Posted: Mon Apr 04, 2011 8:15 pm Post subject:

Kit, thanks for the quick response. I appreciate it.

fzabkar · Deadharddrive regular +3 Joined: 02 Apr 2010 Posts: 210

See my HDD chip database:
http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt

The term, NVRAM, is a misnomer. Both chips are nonvolatile, and neither is a RAM. Nevertheless, for whatever reason, U6 is referred to as the "NVRAM". Its part number is actually 93C76 or S-93C76.

S-93C76A, CMOS SERIAL E2PROM, 8K-bit, 512 x 16, Seiko Instruments Inc.:
http://datasheet.sii-ic.com/en/microwire_eeprom/S93C76A_E.pdf
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-3/DSA-41509.pdf

U3 (LE25FU106B) is a serial flash memory.

LE25FU106B, Sanyo, 1Mbit, 128Kx8, serial flash memory:
http://www.sanyocomponentsdirect.com/content/download/913/6407/file/LE25FU106BTT.pdf

BTW, for the information of others that may encounter this thread, there is 2A fuse, F1, marking code "N", near the SATA power connector:

Littelfuse Surface Mount Fuses, N = 2A, S = 4A:
http://www.farnell.com/datasheets/48294.pdf

Diodes D1 and D2 are also a common failure. I suspect that one would be a 5V TVS diode, the other a Schottky rectifier.

sjsielen · Posted: Thu Apr 21, 2011 4:36 pm Post subject:

Any update on swapping these two chips? I have a similar problem with a Hitachi 7k500 2.5" drive as well.

sunnydreamspace · Deadharddrive regular +5 Joined: 04 Jan 2009 Posts: 540

swap both chip must be work if your drive just got PCB fails
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skype: sunnydreamspace

Dave@LDF4N6 · Posted: Thu May 05, 2011 2:45 am Post subject:

I swapped both chips to the donor PCB but still could not pass the PCB diags on the Atola. I tried several other things but in the end, it was not a successful recovery.

Kit · Deadharddrive regular +2 Joined: 10 Nov 2008 Posts: 56

Dave@LDF4N6 · Posted: Sat May 07, 2011 2:54 pm Post subject:

Yes, the drive did spin up. The Atola diags did not pas the PCB test and suggested a problem with the PCB or the head stack. Assuming I now had a good PCB, I swapped the head stack. At this point I still could not pass the Atola diags. Same error messages. I removed the top of the drive case to watch the arm movement. To me it looked like it was searching for SA but could not find it.

Any thoughts on what I could have done differently or additional things that I could have done?

Kit · Deadharddrive regular +2 Joined: 10 Nov 2008 Posts: 56

Atola is not perfect to work with system area. May be drive can't read some system moduls and can not initialize. You need check system area for reading errors.

Eric Lee · Posted: Sat Jun 11, 2011 2:08 pm Post subject:

Hi, We have this working PCB in stock for sale, pls contact my hotmail to see if I can help or not.

Thanks
Eric
_________________
HK MingDi electronics Co., Ltd. http://www.hkmingdi.com/enindex.asp
MSN/E-mail：eric_lee8341@hotmail.com
Specialize in HDD PCB!!! Real in stock!!
Skype：eric.lee1984

corbingravely · Posted: Wed Jul 08, 2015 8:43 am Post subject:

I think I can help you with this problem, if I an get the damaged parts. I might be able to run some tests and maybe I can diagnose and repair the whole thing for you. All I need is a small fee, which you can decide.

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CORBIN GRAVELY
windows 8 help
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