[GTA04] When is the next and more powerful openmoko releasing

Dr. H. Nikolaus Schaller hns at goldelico.com
Fri Nov 5 15:02:17 CET 2010

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
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