<br>Thanks for the news<br><br><br><div class="gmail_quote">2010/11/5 Dr. H. Nikolaus Schaller <span dir="ltr"><<a href="mailto:hns@goldelico.com">hns@goldelico.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Am 05.11.2010 um 12:39 schrieb Dr. H. Nikolaus Schaller:<br>
<div><div></div><div class="h5"><br>
><br>
> Am 21.10.2010 um 07:36 schrieb Dr. H. Nikolaus Schaller:<br>
><br>
>><br>
>> Am 20.10.2010 um 09:56 schrieb Patryk Benderz:<br>
>><br>
>>> [cut]<br>
>>>> I will keep you updated.<br>
>>>><br>
>>>> Nikolaus<br>
>>> Thanks for sharing this, do you have some photos of this board? Looking<br>
>><br>
>> Here is the photo of a bare board as it came from the PCB factory:<br>
>><br>
>> <a href="http://download.goldelico.com/gta04/images/DSC00627.jpg" target="_blank">http://download.goldelico.com/gta04/images/DSC00627.jpg</a><br>
>> <a href="http://download.goldelico.com/gta04/images/DSC00628.jpg" target="_blank">http://download.goldelico.com/gta04/images/DSC00628.jpg</a><br>
>><br>
>> The next version of the board layout will add two Hirose DF40<br>
>> board-to-board connectors on the display side so that the GTA04<br>
>> can be mounted on a expansion board (e.g. for a different/larger<br>
>> display).<br>
>><br>
>> A populated board will finally look similar to this one:<br>
>><br>
>> <a href="http://download.goldelico.com/gta04/images/DSC00477.jpg" target="_blank">http://download.goldelico.com/gta04/images/DSC00477.jpg</a><br>
>><br>
>>> forward to hear more! :)<br>
>><br>
>> As soon as we have something to share...<br>
><br>
> Ok,<br>
> here is some good and bad news...<br>
><br>
> Good news:<br>
><br>
> last week I got a board where some of the<br>
> basic power control chips are populated (except<br>
> the TPS65950 BGA). Mainly, the backlight<br>
> converter is operating.<br>
><br>
> This one works and after connecting a<br>
> LCD module, we could operate it as a<br>
> lamp :)<br>
><br>
> Yesterday I received the second board where we<br>
> did populate the TPS65950 (power controller).<br>
><br>
> The results of measurements are:<br>
> * the 32 kHz RTC clock is operating<br>
> * when inserting a battery, most voltages are<br>
> available as expected<br>
><br>
> Bad news:<br>
><br>
> * we have a short circuit on the 1V8 rail<br>
><br>
> I have spent most of the night and this morning to<br>
> track this down. It appears to be a solder short circuit<br>
> under the TPS chip (a 0.4 mm pitch BGA).<br>
><br>
> So I am currently sitting at our SMD rework company<br>
> and looking over the shoulder of the CTO who has<br>
> a lot of experience. Unfortunately I can't make<br>
> photos.<br>
><br>
> We already have unsoldered the TPS chip (that needs<br>
> a really sophisticated machine) and the short has<br>
> disappeared.<br>
><br>
> The next step is to solder it back again and do the next tests.<br>
><br>
> If that works, i.e. we get all voltages from the power controller,<br>
> the 26 MHz oscillator should also start working.<br>
><br>
> If that is ok, the OMAP and the POP memory will be soldered.<br>
> Maybe we manage to get it today. Then, we can see if the CPU<br>
> is doing something.<br>
<br>
</div></div>Current status: the 1.8V is now working but the VDD2 (1.2 V) not.<br>
The TPS chip aborts the power up sequence early.<br>
<div class="im"><br>
> Rene will upload some photos of the board and we will<br>
> post a link.<br>
<br>
</div>Here:<br>
<a href="http://download.goldelico.com/gta04/images/DSC00671.jpg" target="_blank">http://download.goldelico.com/gta04/images/DSC00671.jpg</a><br>
<a href="http://download.goldelico.com/gta04/images/DSC00672.jpg" target="_blank">http://download.goldelico.com/gta04/images/DSC00672.jpg</a><br>
<div><div></div><div class="h5"><br>
><br>
> Nikolaus<br>
><br>
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</div></div></blockquote></div><br>