Hacking together a USB-C charger for a cheap Chromebook

Re:Hacking together a USB-C charger for a cheap Chromebook by baybal2 on Monday October 12, 2020 @12:13PM (#24755973)

And a lot of 65W rated tagged cables tend to melt under full load, and one of which was bundled by one quite major hardware brand whose name starts with "A."

This is why a lot of charger makers went for "workarounds" for 5A cables rather than risk being blamed for setting mismarked cables on fire.

Their cable marked "65W" did not actually work on 5A 15V, but on 3A 20V where it is not the issue, but will melt when used by actual 5A 15V.

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Re:Hacking together a USB-C charger for a cheap Chromebook by MrBuddyCasino on Monday October 12, 2020 @02:15PM (#24757528)

Oh that is good to know! I measured 20V/3,?A on my barrel jack adaptor, now wondering if it can actually do 5A as advertised. Is there a way to query the cable for what it will actually report as supported voltages / current?

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Re:Hacking together a USB-C charger for a cheap Chromebook by baybal2 on Monday October 12, 2020 @04:57PM (#24759355)

Easiest way is to get a PD tester. The hard way: page 363 https://usb.org/sites/default/files/USB%20Type-C%20Spec%20R2...

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Re:Hacking together a USB-C charger for a cheap Chromebook by MrBuddyCasino on Monday October 12, 2020 @06:29PM (#24760208)

Did some more research. I don't have a linux system with usb-c rn, but one can maybe query the emarker VDO in sysfs: https://people.kernel.org/bleung/

On windows there are the MUTT tools, but looks cumbersome: https://docs.microsoft.com/en-us/windows-hardware/drivers/us...

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Re:Hacking together a USB-C charger for a cheap Chromebook by MrBuddyCasino on Tuesday October 13, 2020 @06:52AM (#24764229)

Found a hardware thingy that can display CC1/CC2 emarker info.

https://www.youtube.com/watch?v=hMlySYTHbyk

https://www.banggood.com/POWER-Z-PD3_0-QC4_0-USB-Tester-Volt...

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