[Gta04-owner] GTA04 production

[Dr. H. Nikolaus Schaller]

Just a short note: we are coming close to a full understanding
of the issues.

We have now three independent 3rd-party hints that the DM3730CBP
BGA chip might get warpage during soldering. Not the same for
all chips but only some. So using a standard BGA soldering process
that works perfectly for many other BGAs may randomly fail with these
short circuits, giving a very suboptimal yield, wasting a lot of money...

This warpage appears to depend on the reflow temperature profile
and atmosphere. I.e. it is quite tricky and experimental to get close to
100% yield.

But if you eventually know what the root cause is, it is easier
to develop a really good solution.

So I am now confident that we will master this soon.

Nikolaus