[Arm-netbook] 15in laptop LCD up on PCB1

Luke Kenneth Casson Leighton lkcl at lkcl.net
Tue Dec 1 18:43:11 GMT 2015


On Tue, Dec 1, 2015 at 4:05 PM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> ... the only 2 parts of PCB1 that need to be checked and
> debugged are the MicroSD card slot

 confirmed working.  the GPIO pin of the T-FLASH slot had not been
soldered, despite having 260 Centigrade temperatures applied from an
IR heat lamp placed 2cm above it for around 4 minutes.  soldering iron
took care of that, and the micro-sd card slot on PCB1 is operational.

that means that the laptop can boot directly from external micro-sd,
now, when using an A20 CPU Card.  reason: space is so tight on the
6-layer 43x78mm EOMA68-A20 PCB that it was impossible to route SDC0
over to the *opposite* side of the PCB whilst at the same time
crossing SDC3 in the reverse direction, as the A20 and the DDR3 RAM
take up the centre of the board, leaving very little space for
routing.  there are only 3 signal layers (TOP, BOTTOM, layer3).

 just the TDA2822 amplifier circuits and the microphone to verify as
operational, and to track down why the LCD is wobbly, and PCB1 is
done.

l.



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