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Technique to recover BGA's in chip-off (pad cratering)

Discussion of forensic issues related to all types of mobile phones and underlying technologies (GSM, GPRS, UMTS/3G, HSDPA, LTE, Bluetooth etc.)
Subforums: Mobile Telephone Case Law
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jaclaz
Senior Member
 

Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 01, 19 11:03

This approach seems really interesting:
ripitapart.com/2019/01...age-chips/

jaclaz
_________________
- In theory there is no difference between theory and practice, but in practice there is. - 
 
  

Bypx
Newbie
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 00:10

That's a really shitty work and he sucks in soldering techniques.  
 
  

jaclaz
Senior Member
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 11:23

- Bypx
That's a really shitty work and he sucks in soldering techniques.


Did you wake up on the wrong side of the bed today? Question

jaclaz
_________________
- In theory there is no difference between theory and practice, but in practice there is. - 
 
  

JaredDM
Senior Member
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 14:30

I think what Bypx was pointing out is that if the BGA was properly removed the balls wouldn't have ripped out of the chip in the first place. Also, that soldering work does look really crappy in the pictures. However, the idea of using glass over solder paste to re-fill the pulled out holes is an interesting one. Perhaps Bypx didn't actually read the article.

I don't agree with the article's claim about solder wick damaging the pads thought. I've never had that issue, but maybe it happens to people who don't have good techniques (e.g too much force, too little heat, no flux).

IMHO it's much better to just use a proper tool such as Ace Laboratory's Spider Board with PC-3000 flash: blog.acelaboratory.com...se-it.html

That's what we use. Even if a critical point is cratered for some reason, you can adjust the angle of the pin to get contact.
_________________
Lead Data Recovery Tech at Data Medics® - www.data-medics.com 
 
  

jaclaz
Senior Member
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 15:11

- JaredDM
I think what Bypx was pointing out is that if the BGA was properly removed the balls wouldn't have ripped out of the chip in the first place. Also, that soldering work does look really crappy in the pictures. However, the idea of using glass over solder paste to re-fill the pulled out holes is an interesting one. Perhaps Bypx didn't actually read the article.

Yep, but there are more polite ways (like yours Smile ) to convey the message.

- JaredDM

IMHO it's much better to just use a proper tool such as Ace Laboratory's Spider Board with PC-3000 flash: blog.acelaboratory.com...se-it.html


Sure Smile , and my hypothetical Aston Martin DB9 is actually much more stable than my real car (a 1993 Toyota Hi-lux) Rolling Eyes .

How much is that thingy?
Like a couple thousand US$, right? Shocked

Good to know however that the Spider Board can work on (cratered) FBGA's.

jaclaz
_________________
- In theory there is no difference between theory and practice, but in practice there is. - 
 
  

arcaine2
Senior Member
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 22:28

- JaredDM
Also, that soldering work does look really crappy in the pictures. However, the idea of using glass over solder paste to re-fill the pulled out holes is an interesting one.


Yes it is. I had similar case over where chip came off in really bad condition and DAT0 pad ripped out while cleaing from glue. I, or rather the customer, gave up and did not want to try data recovery from NAND. If only i saw this a month ago, heh.  
 
  

JaredDM
Senior Member
 

Re: Technique to recover BGA's in chip-off (pad cratering)

Post Posted: Feb 02, 19 23:21

- jaclaz

How much is that thingy?
Like a couple thousand US$, right? Shocked



I think I paid like $1400 for the spider board. And that's in addition to the $2,400 for the PC-3000 flash system. Mostly it's used for monolithic microSD cards where the controller has failed but the internal NAND is still good, and it's earned its keep there (doesn't take many cases at $1,200 each).

eMMC isn't much different. Basically just an SD card in a different package. If you have the right pinout you can directly read the NAND of most eMMC chips in cases where the memory controller is bad.
_________________
Lead Data Recovery Tech at Data Medics® - www.data-medics.com 
 

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