[Tinkerphones] [Gta04-owner] GTA04A5 and News from the Kernel

[Geoff Wyche]

My 70 year old father is using a 'feature phone' and is looking for a
new phone (United States).  He uses Solaris on a day-to-day basis, and
Linux regularly.  I have been following the list avidly, but am having
difficulty with the price although I know it is a very fair price.  All
other pocket computer/phones are beholden to some power or another, and
I need a pocket computer I can trust.  Why can't I get a simple firewall
on my phone?  Why not a simple firewall for the old telephone network?
We will be buying, when we can.

Keep up the good work.

I may be interested in assisting development.  I do embedded Linux.
--G

On Fri, 2016-10-28 at 18:59 +0200, H. Nikolaus Schaller wrote:
> Hi,
> 
> > Am 27.10.2016 um 19:43 schrieb H. Nikolaus Schaller
> > <hns at goldelico.com>:
> > 
> > Hi,
> > finally we got a time slot tomorrow to do the next
> > soldering tests for the GTA04A5
> 
> 
> ...
> 
> 
> > So thats it for today. And I hope I can bring some
> > news about the GTA04A5 tomorrow.
> 
> 
> we have done the soldering test and the result is really
> interesting and not exactly what I have expected.
> 
> 
> First of all the good news: none of the 4 boards has the
> short circuits in the middle area any more :)
> 
> 
> This is good news!
> 
> 
> But there is a "but":
> now we have a new problem: all 4 boards have been produced
> using different methods of preparation.
> 
> 
> So all 4 methods appear to be better than the previous
> methods done in the first attempt.
> 
> 
> The big question is now: which factor was the most
> important? And which of the 4 methods is really the
> best one to build the other ca. 100 boards with lowest
> risk of getting scrap again?
> 
> 
> To immediately answer this question we should have produced
> more combinations of parameter changes...
> 
> 
> So we have learned a lot, but the outcome is not 100% indicative.
> 
> 
> Now we have to do the best guess.
> 
> 
> For doing this, I need to get the X-ray screen shots to look
> deeper into them and what I also want to try is to find out
> if there are differences in how well the solder joints are.
> 
> 
> Not that we avoid shorts but have missing contacts. This is
> something hardly visible in X-ray.
> 
> 
> Since the production line is already producing something else
> now, we have some days to finally decide.
> 
> 
> Here are some photos from the production of the 4 boards:
> 
> 
> Preparation of stencil:
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Solder paste applied (you see that we did paste only the corners in
> this case):
> 
> 
> 
> 
> 
> firsts chip placed:
> 
> 
> 
> 
> 
> preparation of DM3730 with a snippet of Kapton tape:
> 
> 
> 
> 
> 
> All 4 boards (just 4 DM3730 + PoP installed - all others chips don't
> show problems)
> 
> 
> 
> 
> 
> As soon as I have the X-rays I can share them as well.
> 
> 
> BR,
> Nikolaus
> 
> 
> 
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