werstern digital burnt pcb board

[ja...@cfl.rr.com]

Looking for advice. I have a werstern digital wd800jd. It came with
a burnt PCB BD. the whole left side is burnt. I was able to replace
the PCB bd with a good match but when it is powered up it clicks four
time and then two time, wind down and I assume it will go to safe
mode. It is not recognize through usb or sata ports on the
motherboard. all I get is a disk error at boot. MHDD, XP,Vista we
not see it.
From what I see I think the preamp has been damaged becouse the burnt
part of the pcb bd was on top of the conection for internal ic bd for
the preamp. Am I heading in the right direction or am I missing
something ?

[Tim Farren]

U12 chip?

Tim Farren
Farren Technology Group, Inc.
(904) 233-1982 Cell
(904) 233-5876 Office

On Dec 31, 2009, at 1:54 PM, "ja...@cfl.rr.com" <ja...@cfl.rr.com>
wrote:

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[Madmex]

Agreed, you will definitely need the u12 chip off the old board and hope that it is still good.

[ja...@cfl.rr.com]

I was look for this U12 chipt but have not recognize it. Is there
somewhere that we shed some light to find it. your suggest is to
remove from bad bd and soder on to new before going with preamp

[Tim Farren]

I will be honest - I haven't actually had a success story where
transplanting that u12 chip actually worked, but if I rememer - wd
drives are sensitive to needing the chip. Question is... Is that chip
burned up as well? What caused te board to burn up? Fire?

Tim Farren
Farren Technology Group, Inc.
(904) 233-1982 Cell
(904) 233-5876 Office

On Dec 31, 2009, at 2:06 PM, "ja...@cfl.rr.com" <ja...@cfl.rr.com>
wrote:

[ja...@cfl.rr.com]

Hay Tim I was looking on the PCB BD. and it is not burnt. the damage
is on the othere side of the board. what do think

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[Tim Farren]

I bet the u12 is ok. If you do a google search I bet you can find some
pictures of where that chip is located. It looks pretty distinct. It's
just a bit of a pain to solder something that small. You will need
something like "chipquick" to remove it without damaging the board.

Tim Farren
Farren Technology Group, Inc.
(904) 233-1982 Cell
(904) 233-5876 Office

On Dec 31, 2009, at 2:30 PM, "ja...@cfl.rr.com" <ja...@cfl.rr.com>
wrote:

[ja...@cfl.rr.com]

Thankyou for everyones help I will be attempting this tomorrow. I am
off to a New Year's party may everyone have a Happy New Year

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[Madmex]

Luis (I googled you),

I have had very good luck transplanting the U12 chip, and I second Tim's advice that you definitely want to do this with something like chipquik, but you can do it with standard solder in a pinch.  A few points of advice however, once you locate the U12 chip.

Understand that the chip only goes on "one way".  If you have good eyesight, or better yet a magnifying glass, if you look at the top of the chip you will notice that one corner has a small, dot-shaped dent, this is Pin 1.  Make sure that when you transplant the chip you have the donor board oriented the same way so you don't accidentally solder the chip backwards.  Because the chip is so small, it is very easy for the small hole to get covered with flux and become invisible.  I can (sadly) say from experience that if you transplant the chip and accidentally solder it backwards, that you will fry the donor PCB and run a real risk of also frying the U12 chip.

Good luck!

Karlo

[Mike Hamilton]

I've taken a couple storage chips off Thumb drives before. (Experimenting with Flash Data recovery) With that experience I've learned that the best thing to do after the removal is to set the chip in an alcohol bath (99.9% content Not a beer :D) and then clean both sides of the chip with a brush. Very very light rubbing, making sure not to bend any pins. Run the brush in the same directions that the pins face to keep from bending them. That will give you a clean chip which makes pin 1 easier to see and the chip will be easier to handle (Not sticky or gunked up).

Hope that helps!

Mike

[ja...@cfl.rr.com]

Happy New Year everyone. I ordered Chip-Quick but I could not wait
and tried to removed the U12 chip with desodering braid. I was able
to remove it from the damge PCB bd but when I removed it from the
donor bd I lost my contacts on one whole side. I guess I will have to
wait for chip-quick but I will need to look for another donor bd.
Does any one have donor PCB BD this info on PCB BD is 2061-701335-005
rev A. If some has from a WD800JD-00mSA1 with DCM = NTJCA made in
Malaysia. I hope I will not to transfer the U12 chip on the next PCB
bd

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[Tim Farren]

Oh no.. you used the Donor first??

I meant to tell you that could happen. The contacts are very fragile. If you're not careful they will rip right off!!

I guess you need to look for another donor now, as you have no place to attach the transplanted U12 chip!

Tim Farren
Farren Technology Group
(904) 233-1982 Cell
(904) 233-5876 Nikki Farren (Office Manager)
Email: t...@farrentech.com
Remote Support: http://www.farrentech.com

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[ja...@cfl.rr.com]

I hoping that with chip-quick and a new donor bd it will or maybe the
new donor i will nto have replace chip

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[ja...@cfl.rr.com]

Can any one help I removed the u12 chip from burnt bd and sodered it
to new donor and the clicking noise stop but drive is still not
recognize and sound like motor not even spinning

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[Madmex]

are you 100% sure you placed the chip on the new board the right way and it didn't get soldered onto the board 180 degrees off?

I know I said this once before, but symptoms of this happening is that the drive just sat there doing nothing and the U12 chip got REALLY hot.. hot enough to melt the foam separator that this drive had between the pcb and the drive.

The donor board was fried.. the u12 (miraculously) was not.

Otherwise, I'd say make sure that you don't have any leftover solder that is connecting any of the pins/pads together and causing unwanted connections on that surface.

Karlo

[Jandh]

I mark the chip to make sure I solder in the right position.  the original PCB BD was burnt but not were the U12 chip was but I have no way of knowing if it is bad.  will try to desoldering  and resoldering to see if this help.  If none of this works what my next step

[ja...@cfl.rr.com]

Thank You Madmex I unsoldered and resolder the u12 chip and motor is
spinning but I am at square one again. The hard drive turns on click
2 time and does that 3 times and that is it. we not recognize usb or
internal controller. I wondering if my next step is swaping heads or
is there something I am missing

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[Madmex]

There is a good chance that you may have shorted something out on the
pcb when you applied power to the chip and it wasn't soldered
correctly. The contacts are very sensitive.

I'd solder the original chip back onto the donor pcb and test it to
see if it still works before proceeding in cracking open the case of
the original.

There is a good chance you might need another pcb.

Karlo

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[ja...@cfl.rr.com]

Thank You for reply. I resoldered the chip and did a head swap from a
donor and I was able to retreive some data before hard died again.
Hopefully client will be satisfied I can leave at that.

[Scott Moulton]

Awesome. Its all about persistence....

Thank you,

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