[GTA04] When is the next and more powerful openmoko releasing
sylvain.pare at gmail.com
Sat Nov 6 12:35:05 CET 2010
Thanks for the news
2010/11/5 Dr. H. Nikolaus Schaller <hns at goldelico.com>
> Am 05.11.2010 um 12:39 schrieb Dr. H. Nikolaus Schaller:
> > Am 21.10.2010 um 07:36 schrieb Dr. H. Nikolaus Schaller:
> >> Am 20.10.2010 um 09:56 schrieb Patryk Benderz:
> >>> [cut]
> >>>> I will keep you updated.
> >>>> Nikolaus
> >>> Thanks for sharing this, do you have some photos of this board? Looking
> >> Here is the photo of a bare board as it came from the PCB factory:
> >> http://download.goldelico.com/gta04/images/DSC00627.jpg
> >> http://download.goldelico.com/gta04/images/DSC00628.jpg
> >> The next version of the board layout will add two Hirose DF40
> >> board-to-board connectors on the display side so that the GTA04
> >> can be mounted on a expansion board (e.g. for a different/larger
> >> display).
> >> A populated board will finally look similar to this one:
> >> http://download.goldelico.com/gta04/images/DSC00477.jpg
> >>> forward to hear more! :)
> >> As soon as we have something to share...
> > Ok,
> > here is some good and bad news...
> > Good news:
> > last week I got a board where some of the
> > basic power control chips are populated (except
> > the TPS65950 BGA). Mainly, the backlight
> > converter is operating.
> > This one works and after connecting a
> > LCD module, we could operate it as a
> > lamp :)
> > Yesterday I received the second board where we
> > did populate the TPS65950 (power controller).
> > The results of measurements are:
> > * the 32 kHz RTC clock is operating
> > * when inserting a battery, most voltages are
> > available as expected
> > Bad news:
> > * we have a short circuit on the 1V8 rail
> > I have spent most of the night and this morning to
> > track this down. It appears to be a solder short circuit
> > under the TPS chip (a 0.4 mm pitch BGA).
> > So I am currently sitting at our SMD rework company
> > and looking over the shoulder of the CTO who has
> > a lot of experience. Unfortunately I can't make
> > photos.
> > We already have unsoldered the TPS chip (that needs
> > a really sophisticated machine) and the short has
> > disappeared.
> > The next step is to solder it back again and do the next tests.
> > If that works, i.e. we get all voltages from the power controller,
> > the 26 MHz oscillator should also start working.
> > If that is ok, the OMAP and the POP memory will be soldered.
> > Maybe we manage to get it today. Then, we can see if the CPU
> > is doing something.
> Current status: the 1.8V is now working but the VDD2 (1.2 V) not.
> The TPS chip aborts the power up sequence early.
> > Rene will upload some photos of the board and we will
> > post a link.
> > Nikolaus
> > _______________________________________________
> > Openmoko community mailing list
> > community at lists.openmoko.org
> > http://lists.openmoko.org/mailman/listinfo/community
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