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**llonen** · 03-09-2019, 12:14 PM

Re: Tv SoC BGA

If your referring to re-flowing or re-balling I no longer offer this service and pretty much no longer replace GPU's or BGA SoC since sourcing reliable replacement parts was becoming problematic. There are more than enough papers on academic research sites that look into characterising failures of flip chip and bump failure modes, none of these that I have looked at point to pcb / bga solder ball problems rather the failures are evidenced to be an internal failure with in the chip fabrication itself.

While I have not really had any repairs come back to me, I don't consider re-baling a long term repair solution.

**capwizard** · 03-09-2019, 02:09 PM

Re: Tv SoC BGA

do you mean this?

Watch "Reballing flip chip GPUs is BULLSHIT - the truth about dead laptop GPUs & repairing them." on YouTube
https://youtu.be/1AcEt073Uds

His mouth is much cleaner than before.

**llonen** · 03-09-2019, 08:41 PM

Re: Tv SoC BGA

Not really since I am not familiar with the 'publisher' there is however an extensive amount of academic material available relating to the subject of flip bga failure modes. These are a few that make interesting reading.

https://www.researchgate.net/publica..._MICRO_IMAGING

https://cdn.badcaps-static.com/pdfs/...33ec03fd09.pdf

https://cdn.badcaps-static.com/pdfs/...c567dd9d53.pdf

https://cdn.badcaps-static.com/pdfs/...c3a1cee3ec.pdf

**llonen** · 03-10-2019, 02:54 AM

Re: Tv SoC BGA

So yes a more thorough reading of at least some of the academic material did or still points towards some of the problems being solder ball related so yes there might be some millage in re balling. That said I suspect there was and still is way too much reflow / re balling of dead GPU's and other BGA chipsets. Unless I can source reliable replacement chipset's and or GPU's this is one repair area I am no longer prepared to put my name to.

That said around the time I decided to get out of the GPU re-balling rat run I had come across some documents that dealt very specifically with the subject of internal solder bump and interconnection failure modes for Flip BGA, cant seem to find the specific docs at the moment though. As a side note to this with dual GPU macbook systems there is some good millage to had from disabling the failed GPU and using the Intel graphics chip where fitted. Slows the system down graphics wise but the customer ends up with a functional Macbook again.

**capwizard** · 03-10-2019, 09:34 PM

Re: Tv SoC BGA

Let’s listen to what the robot says.

Interconnection in IC Assembly
https://slideplayer.com/slide/8926598/

Packaging.
https://slideplayer.com/slide/1526718/

FUNDAMENTALS OF IC ASSEMBLY
http://slideplayer.com/slide/4763232/release/woothee

This one is a real person:
Overview of Copper Pillar Technology
https://www.youtube.com/watch?v=pigf04h7PEY

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