[Arm-netbook] next step is a boot image

Andreas Grapentin andreas at grapentin.org
Mon Jan 23 12:49:33 GMT 2023

> On 22. Jan 2023, at 23:15, Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
> On Sun, Jan 22, 2023 at 7:46 PM Andreas Grapentin <andreas at grapentin.org> wrote:
>> I removed the RT8288, and now the 5V rail is no longer short to ground. However, I still can’t power the board over USB, I only get around 13mV on the 5V rail. I’ll check around some more and see what I can find. maybe a resistor is faulty.
> next thing to check will be the SY6280 which is a current-limiter IC.
> datasheets and schematics:
> https://hands.com/~lkcl/eoma/microdesktop/

I’m looking at the SY6280, but I’m not sure what I’m looking at. I see 5V at the OUT pin going to the USB OTG, and I see no voltage an the IN line to the 5V rail. Enable is pulled high, and both resistors are good at 10k and 6.8k respectively. I have no idea how to check C9 or C8, but I assume those are good.

In my limited understanding, this does seem to indicate that the chip is faulty, right? I’ll try to get a replacement and see if swapping it out changes anything. I’ll also try to get a replacement for the RT8288 just for kicks.


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