[chbot] BGA reballing etc.

Yani Dubin yani.dubin at gmail.com
Fri Feb 20 10:20:17 GMT 2015


Mark B - I meant to tell you that Mark A gave me your Pieco paste press at
the meeting last month. I just got my flux last week, and finally had a
tidy enough table to give it a go tonight. It has been more than 5 years
years since I was an HW engineer and last used a flux/paste gun - but this
did seem good from my first go. Yes, I had issues with it not stopping the
flow immediately after backing off the lever, but this is solvable by
ratcheting back the rod (much as I had to do when using a paste gun).
Thanks for the lend :) (hope that was okay!)

Mark A - no photos yet because I am just practicing (and practicing on Tait
IP at that). I've collected some old dead portable radios with enough life
in them to beep and/or flash when powered up - so perfect as a yes/no
indicator as to whether I've got the hang of the process (and not
completely killing things). So I plan to get a bit of practice
removing/cleaning/reballing these FPGA BGA packages before I graduate to
actual laptop GPUs.

I would have thought a plain and simple 16x16 0.6mm footprint wouldn't be
too big an ask, which is what this model of Altera FPGA uses. And I see you
bought it for the 16x16 0.8mm one and they didn't have that either. It is
amazing how many weird and wonderful stencils they managed to include in
that pack, and yet managed to fail to include anything so straight forward
(and likely also very common?). I will have to try with a much larger
stencil, which is 32x32 in size but with a ring of blanking and a 16x16
square pattern inside. Clamping it will be the issue of course. Perhaps I
will get fed up and cut/file it down to size :)


On Tue, Jan 6, 2015 at 5:30 PM, Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Hi Mark,
> I plan to return it at the next meeting -- neat unit.
> Yet another reason for Yani to turn up :)
> -mark
> At 04:49 p.m. 6/01/2015, m.beckett at amuri.net wrote:
>> Mark
>> Have you had a chance to try the Pico Paste tool I lent you.
>> Could something along those lines be the answer for fiddly application.??
>> Cheers
>> Mark
>> On Tue, 06 Jan 2015 16:34:12 +1300, Mark Atherton wrote:
>>> yup, NP
>>> At 01:27 p.m. 6/01/2015, you wrote:
>>>> Hi Mark, On Tue, Jan 6, 2015 at 6:13 AM, Mark Atherton <
>>>> markaren1 at xtra.co.nz><mailto:markaren1 at xtra.co.nz>markaren1 at xtra.co.nz>
>>>> wrote: I bought the stencils + jig out of curiosity, in the hope that it
>>>> might include a 16 x 16 x 0.8mm pattern (which it appears not to have). So,
>>>> solder balls are missing, but have plenty of spare flux. You are more than
>>>> welcome to the whole lot, but please take some photos of your experiences.
>>>> Okay, great. Yes, I will take you up on that offer - and yes, happy to
>>>> document my trials and tribulations. I will try to be at the next meeting
>>>> if you want to bring it in then. I just put in an order for 10x bottles of
>>>> various sized solder balls (12.5k in each bottle) for $13.50. Free
>>>> shipping, so should be here in a month or so. I'm, not all that great with
>>>> fiddly stuff, so could go either way really. Cheers, Yani.
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