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Newbie to NAND Recovery Question
http://forum.hddguru.com/viewtopic.php?f=10&t=30282		 Page 1 of 1
Author:  ddrecovery [ January 7th, 2015, 13:12 ]
Post subject:  Newbie to NAND Recovery Question
I have recently started to get into NAND recoveries and have purchased VNR by Rusolut. I have this flash drive in with a BGA chip. I am looking to buy a BGA machine but am still researching the best one. I understand from Sasha (VNR) that a machine with bottom heat to ~125C and top ~230-250C adjustable is the best. Any recommendations?

With this particular flash I understand there maybe a chance its encrypted, so given the chance of encryption is there anyway to attempt recovery without a chip off? The connector has come away from the board, one trace has been lifted off the board and one trace has split.

Controller
20-82-00522-4
S249-E4Q90800
SDC1

Attachments:
Controller_HDDG.jpg
Controller_HDDG.jpg [ 1.02 MiB | Viewed 9419 times ]
Connector_HDDG.jpg
Connector_HDDG.jpg [ 838.95 KiB | Viewed 9419 times ]
Author:  data-medics [ January 7th, 2015, 13:43 ]
Post subject:  Re: Newbie to NAND Recovery Question
From what I see in that picture, I'd try soldering in a small piece of wire to reconnect the detached pin. Just use a sharp exact-o-knife to scrape away a small bit of the green lacquer so you can solder to it.
Author:  arvika [ January 7th, 2015, 15:11 ]
Post subject:  Re: Newbie to NAND Recovery Question
Do not desolder chip yet. It looks that it could be easy case with regenerating the traces. Always try simplest solutions, especially with Sandisk controller.
For BGA chip good hotair station is enough. Good one. Ayoue, PT and other similar clones are not good :)
Try Quick 861DS. We have 4 or 5 in lab and works perfect.
Author:  ddrecovery [ January 7th, 2015, 15:21 ]
Post subject:  Re: Newbie to NAND Recovery Question
data-medics wrote:
From what I see in that picture, I'd try soldering in a small piece of wire to reconnect the detached pin. Just use a sharp exact-o-knife to scrape away a small bit of the green lacquer so you can solder to it.

Thanks for the response.
What type/gauge of wire do you use for trace repair?
Author:  pcimage [ January 7th, 2015, 16:34 ]
Post subject:  Re: Newbie to NAND Recovery Question
I would personally carefully remove the USB connection and then patch in fine wires from either that connector (or ideally another known good one) directly onto the good parts of the broken tracks.

The +5v and the gnd pads look OK, but the +/-D will be more tricky, but look do-able.
Author:  HaQue [ January 8th, 2015, 2:32 ]
Post subject:  Re: Newbie to NAND Recovery Question
I get them like this a lot. soldering under a microscope is very easy and you should have a working stick again just for recovery - don't put it back in use after!
Author:  ddrecovery [ January 8th, 2015, 13:36 ]
Post subject:  Re: Newbie to NAND Recovery Question
What gauge wire do you use for this type of repair?
Author:  HaQue [ January 8th, 2015, 17:02 ]
Post subject:  Re: Newbie to NAND Recovery Question
For this type I don't use any as the traces are still long enough to solder back just for recovery. If you look under microscope, you should see better and be able to scrape the PCB coating off carefully, and bend the original trace back. Microscope is also required so you don't bridge anything else with the solder, as the gaps between the signal and ground plane are tiny.

For any other wiring up of flash I strip down cables such as the type that supply DC power to gadgets - it is usually around .010mm but for this repair you can use whatever size you want .2mm would be fine
Author:  ddrecovery [ January 9th, 2015, 11:45 ]
Post subject:  Re: Newbie to NAND Recovery Question
Sorry to bug you guys with these questions. How do you solder with just two hands :? I can put the board in a clamp which is not a problem, but with a solder gun, wire and solder, seems to me you need three hands? I am obviously missing the experts trick here..... :wink:
Author:  HaQue [ January 9th, 2015, 16:20 ]
Post subject:  Re: Newbie to NAND Recovery Question
you dab a tiny bead of solder on the board, then "Tin" the wire. Then you have solder gun in one hand, and wire(in tweezers) in the other. Just touch board with solder and wire together and you should get good connection.
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