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 Post subject: Seagate 2TB pcb swap
PostPosted: June 27th, 2016, 16:13 
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Joined: February 12th, 2014, 1:39
Posts: 11
Location: Portugal
Hi there!

I'm writting to you in an effort of shedding some light to my problem, if there is any.

My seagate barracuda 2TB stoped spinning or giving any signs of life, after I connected it to a most probably faulty power supply. After I inspectioned the pcb and measured some voltages (or its abscence ) I tried to preform a pcb swap.

A friend who's as well skilled as I on electronics, as he was removing the original ROM from faulty pcb broke 2 pins (Vcc and Cs acording to IC datasheet).

Now, is there any way to recover this tiny IC in order to access my HDD? I tried (not very hard yet) to sand part of the IC trying to catch some metal I could solder the pins but no sucess yet.

Are there any other things you might suggest? Is there any way I could use the ROM from the new pcb (probably not)???

Its kinda urgent so I ask if there's anyone with some suggestion, please step forward. Thank you very much!


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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 27th, 2016, 16:21 
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Joined: March 6th, 2010, 3:46
Posts: 463
Location: Kolding | Denmark
Post a clear picture of the damaged ROM there may still be some chances to read the chip.
There are people on here who maybe can reconstruct a ROM for your drive, but you need to post some model details.

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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 27th, 2016, 18:25 
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Joined: October 5th, 2015, 18:53
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Location: Canada
cheapest way is to solder wires instead of broken legs.


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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 28th, 2016, 3:32 
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Joined: January 6th, 2015, 2:21
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Location: Germany
Sanding it is way too harsh for a ROM chip i suggest you don't sand it any further.
Better to use a fiberglass pen to expose the pins as much as possible so you can then solder wires to them.

But your most likely not going to be able to get this ROM to work on a PCB again. You need to buy a ROM programmer and read it that way.

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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 28th, 2016, 3:44 
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Joined: February 12th, 2014, 1:39
Posts: 11
Location: Portugal
digisupport as you can see from the images attached, its a ST2000DM001, the ROM chip is a 25FS406 and the pcb is model 100717520 REV B. (both pcbs are).

The chip lost its legs straight away from desoldering drHDD, and there are no traces of metal part where I could try to solder some wire.

Hope some one can help me recover it. Thank you!


Attachments:
File comment: ROM Chip
IMG_20160628_081144[1].jpg
IMG_20160628_081144[1].jpg [ 1.56 MiB | Viewed 3826 times ]
File comment: PCB Model
IMG_20160628_081216[1].jpg
IMG_20160628_081216[1].jpg [ 1.75 MiB | Viewed 3826 times ]
File comment: Disk Model
IMG_20160628_081244[1].jpg
IMG_20160628_081244[1].jpg [ 1.46 MiB | Viewed 3826 times ]
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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 28th, 2016, 3:47 
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Joined: February 12th, 2014, 1:39
Posts: 11
Location: Portugal
day1data I have a ROM programmer (a USB Whilelm GQ-4X) but nonetheless I need those to pins to make a copy of it.

I will try to buy the fiberglass pen then.


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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 28th, 2016, 10:11 
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Joined: November 29th, 2006, 10:08
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Location: UK
Send the chip to digisupport.

I have first hand experience of his wizardry with "slaughtered" chips :-)

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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 28th, 2016, 13:10 
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Joined: March 6th, 2010, 3:46
Posts: 463
Location: Kolding | Denmark
pcimage wrote:
Send the chip to digisupport.

I have first hand experience of his wizardry with "slaughtered" chips :-)


Thank you Sean :)

@adijay solder is not the best way to attach wires to that chip any more.
Use fiberglas pen under a microscope to expose the tiny bonding wires.
Fix the chip bottom up on veroboard / reader adapter.
connect thin wires to chip with Loctite circuit+ and read the chip.

Or send your chip to me - pm for info.

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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 29th, 2016, 3:47 
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Joined: February 12th, 2014, 1:39
Posts: 11
Location: Portugal
@digisupport thank you for your help. I will buy the pen and the loctite and will try to prefform that procedure. Will post any news as I proceed.


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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 29th, 2016, 7:50 
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Joined: February 12th, 2014, 1:39
Posts: 11
Location: Portugal
BTW I guess I have to buy the thinnest possible pen right?


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 Post subject: Re: Seagate 2TB pcb swap
PostPosted: June 29th, 2016, 8:19 
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Joined: December 8th, 2010, 11:37
Posts: 674
Location: Ottawa, Canada
You can get conductive paint pens that have needle tips and work well for PCB repair. They have been used successfully to repair lifted traces/pads beneath BGA components: http://goo.gl/yp3PRQ

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