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From: Arno Welzel <usenet@arnowelzel.de>
Newsgroups: comp.mobile.android
Subject: Re: Recognizing PD QC chargers
Date: Mon, 14 Oct 2024 22:47:43 +0200
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Mickey D, 2024-10-14 16:58:

> On 14 Oct 2024 11:34:09 +0100 (BST), Theo wrote:
> 
>> There are testers you can buy which will talk to the PD or QC control
>> signals and tell you what it claims to do.  Look on Amazon, Aliexpress, etc.
>>
>> Not a recommendation, just an example:
>> https://www.amazon.com/Voltage-Multimeter-Detection-Capacity-Measurement/dp/B0BS2ZS813/
>>
>> If the microprint tells you the voltages (5/9/12/15/20/48V) you can infer
>> the PD capability from that, but to do that you'd need to read it.  Try
>> taking a photo when lit from an oblique angle, which should pick up the
>> embossing, then zoom into the photo.
> 
> Thanks for that information. 
> 
> What happened to me is I have a desktop portable Jteman bluetooth mount
> which is charged by USB-C but which won't charge out of my only USB-C
> charger (which is an ONKO with 2 USB-C ports and one USB-A port).
> 
>  Charger: 67W Multiport GaN charger
>  Model CH-GN67W2ClA
>  The specs are super complicated (depending on how many ports are used).
>  But I only used one port at a time.

What means "super complicated"? Can you provide a source for that? Maybe
a picture?

> The cables are all known to be good because they charge my phone fine.
> 
> When I plug the Jteman to the USB-C ports of the charger, it won't charge.
>  JTEMAN Phone Stand with Bluetoolh Speaker
>  Product Model: L9
>  Battery capacity: 1800mah
>  Type-C  Input · DC  5V  1A
>  Bluetooth Name: MH669
>  Power of Speaker: 403W
>  Product Size: 136x89x48mm        ~
> 
> But when I plug the Jteman to the USB-A port of the charger, it charges.
> Does anyone have any idea why that happens?

Most likely the speaker does use USB-PD and the USB-C connection is just
there because many smartphones have USB-C cables even for QC using USB A
on the charger side.

> I'm assuming it's a PD/QC thing - but I have no real idea why it happens.

Get a USB tester which displays the protocol as suggested - then you can
check it.

-- 
Arno Welzel
https://arnowelzel.de