Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

Would it work if I bought one of the charge only cables with red
plugs? Presumably they block the signaling on the data wires? Or would
it be cheaper to just buy a Samsung charger?

I thought the idea behind using usb charging was that any charger
could be sued for any device?

Thanks,
Stephen.

On Mon, 12 Dec 2016 11:42:01 +0000, Stephen
wrote:

Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

Would it work if I bought one of the charge only cables with red
plugs? Presumably they block the signaling on the data wires? Or would
it be cheaper to just buy a Samsung charger?

I thought the idea behind using usb charging was that any charger
could be sued for any device?

Thanks,
Stephen.

I have successfully used a Nokia charger to charge a Samsung phone.

Stephen wrote:

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

Would it work if I bought one of the charge only cables with red
plugs? Presumably they block the signaling on the data wires? Or would
it be cheaper to just buy a Samsung charger?

I thought the idea behind using usb charging was that any charger
could be sued for any device?

It should work, maybe not as fast as a 'proper' Samsung charger but
still should charge the phone and tablet.

Have you checked the cable? Have you checked if anything else can be
charged from the wall-wart?

A 'generic' wall-wart USB should provide the minimum 500mA that is
specified for USB 2.0. That *might* not be enough to actually charge
your phone and/or tablet when they are turned on but it should be just
about enough for them to run without discharging. Have you tried
turning phone/tablet off and then charging it? If this works then the
charger isn't powerful enough to charge them when turned on.

--
Chris Green
·

On 12/12/2016 12:00, Jethro_uk wrote:
On Mon, 12 Dec 2016 11:42:01 +0000, Stephen wrote:

snip

IME USB charging is a minefield ... it's as standard as RS-232 (C).

Does the charger supply enough current ? I had a (car) charger which
simply could not keep my phone charged (let alone top it up) when the
satnav was running.

IIRC isn't there a fallback for dumb devices ?

+1
Assuming the charger even works
My Samsung tablet refuses to charge from anything less than a 2.1A
charger, it's not bothered by the brand of the charger though.
Also it will charge from the USB 3.0 on my desktop PC, albeit very slowly

On Monday, 12 December 2016 11:42:02 UTC, Stephen wrote:
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

Would it work if I bought one of the charge only cables with red
plugs? Presumably they block the signaling on the data wires? Or would
it be cheaper to just buy a Samsung charger?

I thought the idea behind using usb charging was that any charger
could be sued for any device?

Thanks,
Stephen.

Chargers don't usually have any inbuilt smarts. If it doesn't work get a refund. Some unbranded chargers are unsafe.


NT

In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

--
*Why do we say something is out of whack? What is a whack?

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it into
a low current charger, a mesage appears on the screen to that effect.

--
from KT24 in Surrey, England

Well, I've never heard of smart chargers that seem to be just usb chargers.
The thing is will the phone charge from a pc usb port? I suspect not.
Luckily, my old banger of a phone, an owasys, seems to charge from my Eye
Glasses usb charger, so no sophistication there
Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Stephen" wrote in message
...
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

Would it work if I bought one of the charge only cables with red
plugs? Presumably they block the signaling on the data wires? Or would
it be cheaper to just buy a Samsung charger?

I thought the idea behind using usb charging was that any charger
could be sued for any device?

Thanks,
Stephen.

Stephen wrote

I bought an unbranded wall-wart to usb output charger
from CPC, hoping to use it to charge my mobile phone
or tablet (both are Samsung). When I connect either device
using the original Samsung cable, neither device charges.

Why is this not working?

Most likely it's a useless charger.

I read a post here some months ago saying that the PSU
and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what
current it will accept?

Yes. But that communication is pretty primitive,
normally the signalling is done with static voltage
levels until you get to USB C which you arent using.

Could it be that the charger I have is not that
sophisticated and is not talking to the phone

Or not signalling what the phone and tablet expect.

or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm
not an Apple man but I think Apple do the same?

Apple actually check the cable, not the charger,
and quite a few non apple cables do work fine.

Would it work if I bought one of the charge only cables with red plugs?

Likely that is what that charger does already, doesn't
have the data wires and so the phone and tablet
doesn't ever start charging because it can't see what
it expects to see with the voltages on the data lines.

Presumably they block the signaling on the data wires?

Yes, but that is likely to be the problem that
stops the phone and tablet from charging.

Or would it be cheaper to just buy a Samsung charger?

Wouldn't be cheaper but will certainly work.

I thought the idea behind using usb charging was
that any charger could be sued for any device?

That was certainly the intentions, but things got quite
messy later when chargers started to be able to deliver
more than the original 0.5A that USB originally supported
and there needed to be a way to signal which could do
that and Apple did that differently to the others.
https://en.wikipedia.org/wiki/USB#Power

After serious thinking charles wrote :
I think that's the point. With my wife's Nokia phone, if you plug it into
a low current charger, a mesage appears on the screen to that effect.

Mine too, but if the message is ignored, it charges anyway though
rather slowly.

On Mon, 12 Dec 2016 11:58:50 +0000, Chris Green wrote:

Have you checked the cable? Have you checked if anything else can be
charged from the wall-wart?

The cable works perfectly when sued with the Samsung charger. I do not
have any other devices to try, so I do not know if the charger is
working,. That said, I bought two chargers and neither work, so it
seems unlikely they are both broken.

A 'generic' wall-wart USB should provide the minimum 500mA that is
specified for USB 2.0.

But that's why I bought these new chargers; they are supposed to be
rated to 2.1A, which is more than the Samsung one is. They were
supposed to be an improvement. I was hoping that it might charger
faster.

On Mon, 12 Dec 2016 04:42:26 -0800 (PST), wrote:


Chargers don't usually have any inbuilt smarts. If it doesn't work get a refund. Some unbranded chargers are unsafe.

I was hoping that coming from CPC meant it might be more respectable
than coming from an auction or market stall.

Stephen wrote
Chris Green wrote

Have you checked the cable? Have you checked if
anything else can be charged from the wall-wart?

The cable works perfectly when sued with the Samsung charger.
I do not have any other devices to try, so I do not know if the
charger is working,. That said, I bought two chargers and
neither work, so it seems unlikely they are both broken.

True.

A 'generic' wall-wart USB should provide the
minimum 500mA that is specified for USB 2.0.

But that is too little for charging a tablet or phone.

But that's why I bought these new chargers; they are
supposed to be rated to 2.1A, which is more than the
Samsung one is. They were supposed to be an
improvement. I was hoping that it might charger faster.

It doesn't work like that. If that was possible
Samsung would have done their charger like that.

Just return the chargers for a refund because they
wont charge your Samsung phone and tablet.

In article ,
Stephen wrote:
But that's why I bought these new chargers; they are supposed to be
rated to 2.1A, which is more than the Samsung one is. They were
supposed to be an improvement. I was hoping that it might charger
faster.

Think all the charge control is done inside the phone. The PS merely
supplies the required volts and current. Obviously, if it can't supply
enough current the phone will either charge slower, or not at all.

But it's rather unlikely Samsung would supply a unit which restricted the
charge time.

--
*If they arrest the Energizer Bunny, would they charge it with battery? *

Dave Plowman London SW
To e-mail, change noise into sound.

In article ,
Brian Gaff wrote:
Well, I've never heard of smart chargers that seem to be just usb
chargers. The thing is will the phone charge from a pc usb port? I
suspect not.

If I plug my Samsung Galaxy phone into the computer via USB - say to
transfer something - it shows it is on charge. Don't know how slow that
would be, though.

--
*Eschew obfuscation *

Dave Plowman London SW
To e-mail, change noise into sound.

On 13/12/2016 00:30, Dave Plowman (News) wrote:
In article ,
Brian Gaff wrote:
Well, I've never heard of smart chargers that seem to be just usb
chargers. The thing is will the phone charge from a pc usb port? I
suspect not.

If I plug my Samsung Galaxy phone into the computer via USB - say to
transfer something - it shows it is on charge. Don't know how slow that
would be, though.

I had access to an early generation USA import Kindle. It would charge
directly from the USB port on the PC but not from a USB hub connected to
said port. Investigation showed that the hub would only provide 0.4A
and it seems that this prevented the charging circuit in the Kindle
coming to life.

--
Chris B (News)

Stephen wrote:
On Mon, 12 Dec 2016 11:58:50 +0000, Chris Green wrote:

Have you checked the cable? Have you checked if anything else can be
charged from the wall-wart?

The cable works perfectly when sued with the Samsung charger. I do not
have any other devices to try, so I do not know if the charger is
working,. That said, I bought two chargers and neither work, so it
seems unlikely they are both broken.

A 'generic' wall-wart USB should provide the minimum 500mA that is
specified for USB 2.0.

But that's why I bought these new chargers; they are supposed to be
rated to 2.1A, which is more than the Samsung one is. They were
supposed to be an improvement. I was hoping that it might charger
faster.

They also need to 'tell' the Samsung that they are 2.1A capable, this
may well be what's not working.

--
Chris Green
·

On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it into
a low current charger, a mesage appears on the screen to that effect.

If I plug my ipad air 2 into an old iphone charger (iphone4) the ipad comes on then switches off in a one second cycle something I wouldn't have expected as on another old charger it just doesn't charge (battery indicator doesn't go green).
There have been sonme instances of the lead causing charguing problems but I haven't come uop against that one yet.

On 12/12/2016 23:50, Rod Speed wrote:

It doesn't work like that. If that was possible Samsung would have done
their charger like that.

Motorola did exactly this when they provided my phone with a 700mA
charger when the phone is capable of charging at 1.7A. (and does)
Funny that the recommended "optional extra" charger is rated at 2.1A

Same with the Lumia SWMBO has, again supplied with a 700mA charger by
Microsoft, but supports charging at 1.5A.

Yeah battery longevity vs charge current blah blah, it's not. It's
simple cost-cutting.

"whisky-dave" wrote in message
...
On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC,
hoping
to use it to charge my mobile phone or tablet (both are Samsung).
When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it
will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it
into
a low current charger, a mesage appears on the screen to that effect.

If I plug my ipad air 2 into an old iphone charger (iphone4) the ipad
comes on
then switches off in a one second cycle something I wouldn't have expected
as
on another old charger it just doesn't charge (battery indicator doesn't
go green).

Most likely that one happens like that because it trys to take the
current it wants from the iphone4 charger and that sags badly
voltage wise when it does that.

There have been sonme instances of the lead causing charguing
problems but I haven't come uop against that one yet.

On Mon, 12 Dec 2016 11:42:01 +0000, Stephen wrote:

Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When I
connect either device using the original Samsung cable, neither device
charges.
snip

Might help if you were more specific about the model.

Very recent ones may be more picky.

Haven't had any problems with Galaxy S3/4/5 phones.

Sony Xperia Z tablet will warn if the charge current is not enough to
charge when the device is turned on.


Cheers


Dave R


--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

Lee wrote
Rod Speed wrote

It doesn't work like that. If that was possible Samsung would have done
their charger like that.

Motorola did exactly this when they provided my phone with a 700mA
charger when the phone is capable of charging at 1.7A. (and does)
Funny that the recommended "optional extra" charger is rated at 2.1A

Yes, but SAMSUNG doesn’t do it like that, as I said.

Same with the Lumia SWMBO has, again supplied with a 700mA charger by
Microsoft, but supports charging at 1.5A.

Yes, but SAMSUNG doesn’t do it like that, as I said.

Yeah battery longevity vs charge current blah blah, it's not. It's simple
cost-cutting.

Which SAMSUNG doesn’t do.

On 12/12/2016 11:42, Stephen wrote:
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.


I believe Samsung chargers used a voltage which exceeded the USB
standard and Samsung devices only charge properly with this over
voltage. Something like 5.2 volts instead of 5 (I made that up just to
give you an idea)

With my really old Samsung tab it was the case that it would charge with
other USB chargers but was really slow.

However recently I have bought a couple of chargers and it charges fine
with them, one a plug socket I bought only last week. I can give you
specific devices if you are interested but maybe you should try all the
chargers you have available.

On 13/12/2016 21:28, Nick wrote:
On 12/12/2016 11:42, Stephen wrote:
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.


I believe Samsung chargers used a voltage which exceeded the USB
standard and Samsung devices only charge properly with this over
voltage. Something like 5.2 volts instead of 5 (I made that up just to
give you an idea)

With my really old Samsung tab it was the case that it would charge with
other USB chargers but was really slow.

However recently I have bought a couple of chargers and it charges fine
with them, one a plug socket I bought only last week. I can give you
specific devices if you are interested but maybe you should try all the
chargers you have available.


A guy here give a different explanation. But the implication is the same
only some USB chargers charge my Tab quickly.

http://android.stackexchange.com/questions/21144/how-much-power-does-a-galaxy-tab-10-1-charger-need-to-supply

See Florian F's answer.

On 13/12/16 21:28, Nick wrote:
On 12/12/2016 11:42, Stephen wrote:
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.


I believe Samsung chargers used a voltage which exceeded the USB
standard and Samsung devices only charge properly with this over
voltage. Something like 5.2 volts instead of 5 (I made that up just to
give you an idea)

With my really old Samsung tab it was the case that it would charge with
other USB chargers but was really slow.

However recently I have bought a couple of chargers and it charges fine
with them, one a plug socket I bought only last week. I can give you
specific devices if you are interested but maybe you should try all the
chargers you have available.





5.2 V is within USB spec IIRC.

The magic forumula is a resistor chain between +5V, 0V and the data lines:

http://blog.curioussystem.com/2010/0...vice-charging/

(any broken images, click on them, the preview is broken)

On 13/12/2016 23:26, Tim Watts wrote:
On 13/12/16 21:28, Nick wrote:
On 12/12/2016 11:42, Stephen wrote:
Hello,

I bought an unbranded wall-wart to usb output charger from CPC, hoping
to use it to charge my mobile phone or tablet (both are Samsung). When
I connect either device using the original Samsung cable, neither
device charges.


I believe Samsung chargers used a voltage which exceeded the USB
standard and Samsung devices only charge properly with this over
voltage. Something like 5.2 volts instead of 5 (I made that up just to
give you an idea)

With my really old Samsung tab it was the case that it would charge with
other USB chargers but was really slow.

However recently I have bought a couple of chargers and it charges fine
with them, one a plug socket I bought only last week. I can give you
specific devices if you are interested but maybe you should try all the
chargers you have available.





5.2 V is within USB spec IIRC.

The magic forumula is a resistor chain between +5V, 0V and the data lines:

http://blog.curioussystem.com/2010/0...vice-charging/


(any broken images, click on them, the preview is broken)

Yep, I did see a similar explanation and reposted to correct my initial
post. I had read it was over voltage a few years ago but this appears a
more convincing argument. Especially when 2 or 3 years ago when I had
the problem I tried 4 of 5 non Samsung chargers and none of them worked
(fast charge). Whereas recently I have bought two new non Samsung
chargers, both of which fast charged.

The one I bought last week was. £11.85

http://www.screwfix.com/p/british-general-13a-2g-sp-switched-socket-3-1a-2g-usb-charger-white/8529p

However I'm tempted to buy some more and this is less money £10 for but
only 2.1A instead of 3.1. Maybe it doesn't do this fast charging either
I can't see how to tell, apart from buying and trying.

http://www.screwfix.com/p/bg-13a-2-gang-sp-switched-socket-usb-charger-outboard-rocker-white/8534f?cm_sp=homepage-_-home-_-8534f

In article ,
Nick wrote:
5.2 V is within USB spec IIRC.

The magic forumula is a resistor chain between +5V, 0V and the data lines:

http://blog.curioussystem.com/2010/0...vice-charging/


(any broken images, click on them, the preview is broken)

Yep, I did see a similar explanation and reposted to correct my initial
post. I had read it was over voltage a few years ago but this appears a
more convincing argument. Especially when 2 or 3 years ago when I had
the problem I tried 4 of 5 non Samsung chargers and none of them worked
(fast charge). Whereas recently I have bought two new non Samsung
chargers, both of which fast charged.

The one I bought last week was. £11.85

http://www.screwfix.com/p/british-general-13a-2g-sp-switched-socket-3-1a-2g-usb-charger-white/8529p

However I'm tempted to buy some more and this is less money £10 for but
only 2.1A instead of 3.1. Maybe it doesn't do this fast charging either
I can't see how to tell, apart from buying and trying.

http://www.screwfix.com/p/bg-13a-2-gang-sp-switched-socket-usb-charger-outboard-rocker-white/8534f?cm_sp=homepage-_-home-_-8534f

Are you certain your Samsung phone can be charged faster by using a
different PS from the one supplied? If you're talking a Galaxy, not
exactly a budget phone and it would be odd to me if just changing such a
cheap part improved the charging time. Which on mine is pretty fast
anyway. Only difference here is I use a charger only USB lead from a PS
built into a socket.

--
*America is so advanced that even the chairs are electric.

Dave Plowman London SW
To e-mail, change noise into sound.

On 14/12/2016 11:04, Dave Plowman (News) wrote:
In article ,
Nick wrote:
5.2 V is within USB spec IIRC.

The magic forumula is a resistor chain between +5V, 0V and the data lines:

http://blog.curioussystem.com/2010/0...vice-charging/


(any broken images, click on them, the preview is broken)

Yep, I did see a similar explanation and reposted to correct my initial
post. I had read it was over voltage a few years ago but this appears a
more convincing argument. Especially when 2 or 3 years ago when I had
the problem I tried 4 of 5 non Samsung chargers and none of them worked
(fast charge). Whereas recently I have bought two new non Samsung
chargers, both of which fast charged.

The one I bought last week was. £11.85

http://www.screwfix.com/p/british-general-13a-2g-sp-switched-socket-3-1a-2g-usb-charger-white/8529p

However I'm tempted to buy some more and this is less money £10 for but
only 2.1A instead of 3.1. Maybe it doesn't do this fast charging either
I can't see how to tell, apart from buying and trying.

http://www.screwfix.com/p/bg-13a-2-gang-sp-switched-socket-usb-charger-outboard-rocker-white/8534f?cm_sp=homepage-_-home-_-8534f

Are you certain your Samsung phone can be charged faster by using a
different PS from the one supplied?

It's a Samsung Tab (2?) 10.1 about 5 years old.

The problem was that when using a non Samsung charger it didn't seem to
charge at all with the screen on and took like 10 hours to charge with
the screen off. During charging as well as a lightening bolt on the
battery icon there was a thin red cross.

Initially I assumed this was due to lack of amps from the non Samsung
charger but further investigation determined it wasn't amp related.

So I'm not saying the new chargers charge faster than a Samsung one just
that they don't charge appallingly slowly. I think there are just two
speeds fast and slow. It is easy to see which the charger is by if the
red cross appears on the battery charging icon.

On Tuesday, 13 December 2016 18:48:38 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC,
hoping
to use it to charge my mobile phone or tablet (both are Samsung).
When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it
will
accept?

Could it be that the charger I have is not that sophisticated and is
not talking to the phone or does Samsung employ some way of checking
whether the supply is a Samsung charger - I'm not an Apple man but I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it
into
a low current charger, a mesage appears on the screen to that effect.

If I plug my ipad air 2 into an old iphone charger (iphone4) the ipad
comes on
then switches off in a one second cycle something I wouldn't have expected
as
on another old charger it just doesn't charge (battery indicator doesn't
go green).

Most likely that one happens like that because it trys to take the
current it wants from the iphone4 charger and that sags badly
voltage wise when it does that.

There have been sonme instances of the lead causing charguing
problems but I haven't come uop against that one yet.

Yes I know but IF the ipad communicates over the data lines it shouldn't get itself into this situation. It'd realise that it couldn't get enough power to charge and give up trying just as my old ipad3 did when trying to get power from the keyboard it comes up with a message telling you it's not charging.

"whisky-dave" wrote in message
...
On Tuesday, 13 December 2016 18:48:38 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC,
hoping
to use it to charge my mobile phone or tablet (both are Samsung).
When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it
will
accept?

Could it be that the charger I have is not that sophisticated and
is
not talking to the phone or does Samsung employ some way of
checking
whether the supply is a Samsung charger - I'm not an Apple man but
I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a
non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it
into
a low current charger, a mesage appears on the screen to that effect.

If I plug my ipad air 2 into an old iphone charger (iphone4) the ipad
comes on
then switches off in a one second cycle something I wouldn't have
expected
as
on another old charger it just doesn't charge (battery indicator
doesn't
go green).

Most likely that one happens like that because it trys to take the
current it wants from the iphone4 charger and that sags badly
voltage wise when it does that.

There have been sonme instances of the lead causing charguing
problems but I haven't come uop against that one yet.

Yes I know but IF the ipad communicates over the data lines

It doesnt in the sense that the charger tells the phone what current it can
provide.

ALL is communicates is that it can provide more than the 500mA
that standard USB port is guaranteed to be able to provide.

it shouldn't get itself into this situation. It'd realise
that it couldn't get enough power to charge

It clearly can provide what a standard USB port can provide.

and give up trying just as my old ipad3 did when trying to get power
from the keyboard it comes up with a message telling you it's not
charging.

But it doesnt say that about a standard USB port, it does charge slowly
from that.

On Wednesday, 14 December 2016 14:36:18 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Tuesday, 13 December 2016 18:48:38 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC,
hoping
to use it to charge my mobile phone or tablet (both are Samsung).
When
I connect either device using the original Samsung cable, neither
device charges.

Why is this not working? I read a post here some months ago saying
that the PSU and the device communicate (presumably over the data
wires) and presumably the phone tells the charger what current it
will
accept?

Could it be that the charger I have is not that sophisticated and
is
not talking to the phone or does Samsung employ some way of
checking
whether the supply is a Samsung charger - I'm not an Apple man but
I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from a
non
Samsung PS. Indeed I bought a mains socket with built in USB charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug it
into
a low current charger, a mesage appears on the screen to that effect.

"whisky-dave" wrote in message
...
On Wednesday, 14 December 2016 14:36:18 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Tuesday, 13 December 2016 18:48:38 UTC, Rod Speed wrote:
"whisky-dave" wrote in message
...
On Monday, 12 December 2016 13:33:52 UTC, charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
Stephen wrote:
I bought an unbranded wall-wart to usb output charger from CPC,
hoping
to use it to charge my mobile phone or tablet (both are
Samsung).
When
I connect either device using the original Samsung cable,
neither
device charges.

Why is this not working? I read a post here some months ago
saying
that the PSU and the device communicate (presumably over the
data
wires) and presumably the phone tells the charger what current
it
will
accept?

Could it be that the charger I have is not that sophisticated
and
is
not talking to the phone or does Samsung employ some way of
checking
whether the supply is a Samsung charger - I'm not an Apple man
but
I
think Apple do the same?

I have a couple of Samsung devices and both charge just fine from
a
non
Samsung PS. Indeed I bought a mains socket with built in USB
charger
outlets (to make things neater than wall warts) and that charges
everything I have that uses this system.

Are you sure your new charger produces enough current?

I think that's the point. With my wife's Nokia phone, if you plug
it
into
a low current charger, a mesage appears on the screen to that
effect.

If I plug my ipad air 2 into an old iphone charger (iphone4) the
ipad
comes on
then switches off in a one second cycle something I wouldn't have
expected
as
on another old charger it just doesn't charge (battery indicator
doesn't
go green).

Most likely that one happens like that because it trys to take the
current it wants from the iphone4 charger and that sags badly
voltage wise when it does that.

There have been sonme instances of the lead causing charguing
problems but I haven't come uop against that one yet.

Yes I know but IF the ipad communicates over the data lines

It doesnt in the sense that the charger tells the phone what current it
can
provide.

That's what the version of USB does.


ALL is communicates is that it can provide more than the 500mA
that standard USB port is guaranteed to be able to provide.

What is a standard USB port ?

That 500ma they are required to be able to supply.

Keyboards can typically only suply 100ma even if USB2
Some PC's have differtn standards depending on which
USB port you plug them into. All the PCs here if yuo wanted
to power an external drive you'd have to plug them in the
back otherwise they wouldnlt spin up properly.

Thats because they need more than 500ma.

it shouldn't get itself into this situation. It'd realise
that it couldn't get enough power to charge

It clearly can provide what a standard USB port can provide.

Doesn't seem to be able to.

Of course it does, otherwise it wouldnt be
able to charge the iphone 4S it came with.

Are you saying all USB ports can supply the same current ?

Nope.

and give up trying just as my old ipad3 did when trying to get power
from the keyboard it comes up with a message telling you it's not
charging.

But it doesnt say that about a standard USB port, it does charge slowly
from that.



What is a standard USB port in your world ?

One that can supply 500ma.