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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 22:49:07 +0200
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Arno Welzel, 2024-10-14 22:47:

> 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

.... does NOT USE USB-PD of course ...

Because then it ALWAYS works with a USB-A connector, maybe just with the
minimum charge at 5V and 0.5A. But USB-C requires to negotiate the
charging protocol before you can draw power to charge.

> 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