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Searching PCB for SAMSUNG HD753LJ
http://forum.hddguru.com/viewtopic.php?f=15&t=15345		 Page 1 of 1
Author:  mo2this [ April 4th, 2010, 17:44 ]
Post subject:  Searching PCB for SAMSUNG HD753LJ
I am searching a PCB for a

SAMSUNG HD753LJ
Rev.A
2008.03

by accident I had the same HDD, but with another production date 2007.12 - which at least showed me, that the above HDD still has some inner life, but with that version it did not show up, at least it was spinning .. thus I guess wrong firmware (though as I cannot access the model for which I am searching a new PCB, I cannot give the correct Firmware version and go by production date)

I am also willing to buy a whole HDD ... just desperately trying to recover some data.
Thank you
Author:  mo2this [ April 4th, 2010, 18:23 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
on request .. here some more details + image:

The HDD was usually mounted in an external case (icybox), which was usually made for two HDD and worked well there. After we mounted a second one - everything seemed fine. But when I looked at the case some hours later, the whole case had stopped working. It took me a while to notice, that when I remove this HDD, which is the subject here, the case inclusive the other HDD started up again.
The removed HDD though just did not start up at all. Bringing it to a single external case only set the power control lights of this case to flickering - thus we assumed, that there is an issue with the electronic circuit.
Meanwhile, as mentioned before, I got the HDD starting, when I had swapped the PCB from an elder model of the same SAMSUNG HDD HD753LJ ... but I did not get it recognized .....
... so that's basically the story .. I also enclose an image .. I hope it's good enough - as I only have my mobile around at the moment ....
Image
Thank you for your immediate reply.
Author:  networkpc3000 [ April 4th, 2010, 19:00 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
hi,
may be you no need to buy PCB for take off data. but this kind of PCB hard to replace PCB by yourself. please contact me by email or MSN if interest in it. i have this kind of PCB for sell and be able to help you replace it with special tools. thanks.
Author:  chipmunk [ April 14th, 2010, 13:12 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
I am trying to recover a similar drive.
Date: 2008.02

This one was fried by a bas power supply.
Lets keep each other posted?
Author:  mo2this [ April 18th, 2010, 16:46 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
Hello,

thanks for all the replies. I meanwhile got a drive from the same period 2008.03 and really got it running and meanwhile my rescuing my data.
I had tried earlier the PCB from a 2007.12 HDD, but that did not give me access.

some happy moment finally ....
Author:  networkpc3000 [ April 18th, 2010, 22:49 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
have you try to swap ROM chip?
Author:  pcimage [ April 19th, 2010, 3:12 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
networkpc3000 wrote:
have you try to swap ROM chip?


What ROM chip? ;-)
Author:  fzabkar [ April 19th, 2010, 10:24 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
chipmunk wrote:
I am trying to recover a similar drive.
Date: 2008.02

This one was fried by a bas power supply.
Lets keep each other posted?

Check the two TVS diodes near the power connector for short circuits. Use a multimeter on the 200 ohms range. Also check the zero ohm resistor. It may have fused open.

The faulty diode can be removed, and the resistor can be replaced by a short length of wire, or a 2A picofuse. Just be sure that your PSU is OK, as you will no longer have any protection on the affected supply rail.

For continued protection, you can replace the 12V and 5V TVS diodes with an SMBJ12A and SMAJ5.0A, respectively, from Farnell, Mouser, Digikey.

Good luck.
Author:  craig6928 [ April 19th, 2010, 18:30 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
is it me or can you see a blown ic chip there right at the top ?????????

for sure that looks damaged to me :shock:
Author:  Amarbir[CDR-Labs] [ April 19th, 2010, 22:22 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
Well ,
There is No ROM In This External To the Main Chip .Lol Also If I Was At his Place i Would Have checked the electronics And Replaced The Ic On The HDD
Author:  tosole [ April 29th, 2010, 18:12 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
Same problem as mo2this. Lot of pro + personal data to recover.

Left TVS diode (near to power) seemed burnt. Checked with multimeter, it is totally shorted cut.

@fzabkar : You are a genius

I simply disconnected the diode and brazed the diode end. That was it !

Thanks :)

Attachments:
File comment: After
IMG_1081.JPG
IMG_1081.JPG [ 959.49 KiB | Viewed 19678 times ]
File comment: Before
IMG_1078.JPG
IMG_1078.JPG [ 638.55 KiB | Viewed 19678 times ]
Author:  Cosworth [ March 5th, 2011, 3:41 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
Hello

I just joined, I need a simular PCB but mines was made in 2009,07.

I tried using a 2008,03 board but it thought my 753 drive was a 1T drive.

If anyone has this board pls PM me.
Author:  networkpc3000 [ March 8th, 2011, 1:33 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
hi,
donor PCB get same model be fine.
Author:  Cosworth [ March 17th, 2011, 7:06 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
MY two drives 2008,03 and 2009,07 have ever so different boards and dont work if i swap them! It has different firmware and thinks my 750GB drive is a 1T and cant read the data.

I cannot flash these firmwares.

the good board is BF-00185A R00 REV 4(2009,07)

the bad board and the one i need is BF-00206B R00 REV 5(2008,03)

Maybe its this REV thing that is different and i assume it stands for reversion
Author:  fzabkar [ March 18th, 2011, 18:34 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
It's "revision". :-)

If you have a digital multimeter, there are a few simple measurements you can make. Your replacement PCB will be very useful for comparison.

A clearer photo would help also.
Author:  cesar509 [ May 17th, 2011, 20:44 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
"A backup a day keeps DR away. "

This is so true.. i still have not had any luck finding a replacement PCB for my hdd. samsung HD103SJ Rev A. 2010.04
Author:  j22pedro [ August 29th, 2013, 9:30 ]
Post subject:  Re: Searching PCB for SAMSUNG HD753LJ
Hello mo2this, I'm having a problem with a 2007.12 HD753LJ disk, as you have, and I'm hoping that you still have this 2007.12 disk that you mentioned on you post; "by accident I had the same HDD, but with another production date 2007.12 ".

can you please tell me if you still have this disk? I'm driving crazy trying to recover some data for my HD753LJ...

Thank you.
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