Thanks for the news
2010/11/5 Dr. H. Nikolaus Schaller <h...@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. > > Here: > http://download.goldelico.com/gta04/images/DSC00671.jpg > http://download.goldelico.com/gta04/images/DSC00672.jpg > > > > > Nikolaus > > > > _______________________________________________ > > Openmoko community mailing list > > community@lists.openmoko.org > > http://lists.openmoko.org/mailman/listinfo/community > > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community >
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