Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 399
Default Phone Charging

A friend has an old Motorolla W376g phone and the charger can't be found. I
can get it to charge from a car charger I use as well as from a desktop
multi-outlet charger I have. But a couple of different wall wart chargers
won't charge it while they will charge any of my devices. I did a search
and can't find any details on why this might not work other than that
Motorola warns to only use Motorola chargers of course.

I've read that some phones or chargers have a resistor indicating the
charging capacity, but I don't recall which end has the resistor. Also, I
think this is not done for the lower current devices, rather for the high
current devices. I'm wondering if the phone is looking for this resistor.
Obviously I'll need to pay for a charger that clearly says it will charge
this phone. I just don't get what is happening in this case.

Any ideas?

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
  #2   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 14
Default Phone Charging

On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be found. I
can get it to charge from a car charger I use as well as from a desktop
multi-outlet charger I have. But a couple of different wall wart chargers
won't charge it while they will charge any of my devices. I did a search
and can't find any details on why this might not work other than that
Motorola warns to only use Motorola chargers of course.

I've read that some phones or chargers have a resistor indicating the
charging capacity, but I don't recall which end has the resistor. Also, I
think this is not done for the lower current devices, rather for the high
current devices. I'm wondering if the phone is looking for this resistor.
Obviously I'll need to pay for a charger that clearly says it will charge
this phone. I just don't get what is happening in this case.

Any ideas?


I think they put a 1k ressitor from the USB+ to D+ so the phone knows
its a wall wart, other wise the usb protocol takes care of requesting
power from the hub.
My Old Razr is setup this way.

Cheers
  #3   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 4,045
Default Phone Charging

On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be found.


Mini USB connector. You'll need to add a 200k resistor and short pins
2 and 4:
http://pinoutguide.com/ChargersAdapters/razrv3_charger_pinout.shtml

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #4   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 399
Default Phone Charging

Jeff Liebermann wrote on 11/19/2017 8:02 PM:
On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be found.


Mini USB connector. You'll need to add a 200k resistor and short pins
2 and 4:
http://pinoutguide.com/ChargersAdapters/razrv3_charger_pinout.shtml


I just realized this connector resistor issue is not likely to be my
problem... I think. I can charge this phone using two generic adapters I
have. One is a box with six high current outputs, at least two rated for
2.1 amps and the other four rated for 1 amp or maybe 4 and 2 (other way
around). The other unit that will work with the phone is a car charger, but
then that one is also a high current charger. They are all connected with
the same cable and I'm pretty sure the charger end of the cable only has
four pins so there is no place to connect the resistor to the "ID" pin.

This phone won't charge from my laptop, so I don't think the phone is
negotiating anything over the USB data pins, or maybe it is? I don't think
either of the chargers have a USB host built in and the laptop clearly does.

I'm still stumped.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
  #5   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 133
Default Phone Charging

In sci.electronics.repair rickman wrote:

I'm still stumped.


Because you aren't listening to the other responses, those phones need a
modified cable to charge. Many of those type also used that mini (micro?)
usb jack to use as headphones, standard cable to export the photos and of
course to charge it.

Anyway, I doubt your "I can't find it" claim...

https://www.amazon.com/Motorola-W376.../dp/B00KC6CW2G

seems to be what you need.

-bruce



  #6   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 399
Default Phone Charging

Bruce Esquibel wrote on 11/20/2017 6:29 AM:
In sci.electronics.repair rickman wrote:

I'm still stumped.


Because you aren't listening to the other responses, those phones need a
modified cable to charge. Many of those type also used that mini (micro?)
usb jack to use as headphones, standard cable to export the photos and of
course to charge it.


I have no idea what you read. Of course I have a cable with the mini USB
connector. There's no way to plug it in otherwise. I don't know why anyone
would bother to tell me that. I said I could charge the phone with two
chargers I have using the same cable as used with the two chargers that
won't charge the phone. So clearly the cable is not the issue. Further it
is clear the chargers don't have the resistor because in the Motorola cable
it is on a pin that does not exist in the type A connector on the chargers,
so no way to connect it. I said all this in the post you replied to. I
think you didn't listen to my post.


Anyway, I doubt your "I can't find it" claim...

https://www.amazon.com/Motorola-W376.../dp/B00KC6CW2G

seems to be what you need.


"can't be found" is referring to the charger that came with the phone. That
is why I am looking for another way to charge this phone. The original
charger is MIA.

Thanks for your help.

I've measured the voltage on the different chargers, but didn't write down
the numbers as they were all pretty close to 5 volts. One web page did
mention the phone would not charge if the voltage was too high or too low.
I'm wondering how critical the high voltage is. Or possibly the phone is
triggering to not charge because the low voltage is too low and I don't see
it on the USB meter because it is too quick to see with the slow update
rate? The chargers that work are definitely higher current.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
  #7   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 23
Default Phone Charging

These are handy devices to measure the working capacity of the charger:
https://www.ebay.com/sch/sis.html?_n...53.m2749.l2658

The cheapest ones have worked fine for me.




On 11/20/2017 4:26 AM, rickman wrote:
Bruce Esquibel wrote on 11/20/2017 6:29 AM:
In sci.electronics.repair rickman wrote:

I'm still stumped.


Because you aren't listening to the other responses, those phones need a
modified cable to charge. Many of those type also used that mini (micro?)
usb jack to use as headphones, standard cable to export the photos and of
course to charge it.


I have no idea what you read.Â* Of course I have a cable with the mini
USB connector.Â* There's no way to plug it in otherwise.Â* I don't know
why anyone would bother to tell me that.Â* I said I could charge the
phone with two chargers I have using the same cable as used with the two
chargers that won't charge the phone.Â* So clearly the cable is not the
issue.Â* Further it is clear the chargers don't have the resistor because
in the Motorola cable it is on a pin that does not exist in the type A
connector on the chargers, so no way to connect it.Â* I said all this in
the post you replied to.Â* I think you didn't listen to my post.


Anyway, I doubt your "I can't find it" claim...

https://www.amazon.com/Motorola-W376.../dp/B00KC6CW2G


seems to be what you need.


"can't be found" is referring to the charger that came with the phone.
That is why I am looking for another way to charge this phone.Â* The
original charger is MIA.

Thanks for your help.

I've measured the voltage on the different chargers, but didn't write
down the numbers as they were all pretty close to 5 volts.Â* One web page
did mention the phone would not charge if the voltage was too high or
too low. I'm wondering how critical the high voltage is.Â* Or possibly
the phone is triggering to not charge because the low voltage is too low
and I don't see it on the USB meter because it is too quick to see with
the slow update rate?Â* The chargers that work are definitely higher
current.


  #8   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 4,045
Default Phone Charging

On Mon, 20 Nov 2017 04:50:57 -1000, John Keiser
wrote:

These are handy devices to measure the working capacity of the charger:
https://www.ebay.com/sch/sis.html?_n...53.m2749.l2658

The cheapest ones have worked fine for me.


I have a few of those and use them for testing chargers and phones.
Very handy. They're especially fun when I connect them all in series
and notice that both the voltage and current readings are not even
close to each other. If you're using one for measurements, rather
than just fault finding, I suggest you make a calibration chart.

I also bought a USB adjustable load:
https://www.ebay.com/itm/282437868849
which is useful for testing if a charger can actually deliver the
current printed on the label. Most will not or go into oscillation at
the rated current. It's not the best quality instrument, but it works
for the purpose intended.

--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
  #9   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 83
Default Phone Charging

On Mon, 20 Nov 2017 17:39:34 +1000, rickman wrote:

Jeff Liebermann wrote on 11/19/2017 8:02 PM:
On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be
found.


Mini USB connector. You'll need to add a 200k resistor and short pins
2 and 4:


I just realized this connector resistor issue is not likely to be my
problem... I think. I can charge this phone using two generic adapters
I have. One is a box with six high current outputs, at least two rated
for 2.1 amps and the other four rated for 1 amp or maybe 4 and 2 (other
way around). The other unit that will work with the phone is a car
charger, but then that one is also a high current charger. They are all
connected with the same cable and I'm pretty sure the charger end of the
cable only has four pins so there is no place to connect the resistor to
the "ID" pin.

This phone won't charge from my laptop, so I don't think the phone is
negotiating anything over the USB data pins, or maybe it is? I don't
think either of the chargers have a USB host built in and the laptop
clearly does.

I'm still stumped.


Some usb leads for chargers only run the +5 and Gnd - so they can't be
used on PC's etc


--
The latest set of Shadow Broker tools shows the UK, USA, Canada,
Australian and New Zealand spy agencies were hacking into domestic home
routers. Who gave them permission to spy on our kids?
  #10   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 2,833
Default Phone Charging

On Tue, 21 Nov 2017 11:58:18 +1000, "David Eather"
wrote:

On Mon, 20 Nov 2017 17:39:34 +1000, rickman wrote:

Jeff Liebermann wrote on 11/19/2017 8:02 PM:
On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be
found.

Mini USB connector. You'll need to add a 200k resistor and short pins
2 and 4:


I just realized this connector resistor issue is not likely to be my
problem... I think. I can charge this phone using two generic adapters
I have. One is a box with six high current outputs, at least two rated
for 2.1 amps and the other four rated for 1 amp or maybe 4 and 2 (other
way around). The other unit that will work with the phone is a car
charger, but then that one is also a high current charger. They are all
connected with the same cable and I'm pretty sure the charger end of the
cable only has four pins so there is no place to connect the resistor to
the "ID" pin.

This phone won't charge from my laptop, so I don't think the phone is
negotiating anything over the USB data pins, or maybe it is? I don't
think either of the chargers have a USB host built in and the laptop
clearly does.

I'm still stumped.


Some usb leads for chargers only run the +5 and Gnd - so they can't be
used on PC's etc


They're known as "charging cables", for the obvious reason. "Charging
and download", or some such, have all the wires. They're bulkier,
less flexible, so there is a reason for both.


  #11   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 399
Default Phone Charging

John Keiser wrote on 11/20/2017 9:50 AM:
These are handy devices to measure the working capacity of the charger:
https://www.ebay.com/sch/sis.html?_n...53.m2749.l2658


The cheapest ones have worked fine for me.


How do they measure the capacity of the charger? They measure the current
drawn by the load and the voltage. I have one and when I used it with the
phone and charger it indicated a voltage slightly over 5 volts and never
registered a current unless the phone would allow charging to begin.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
  #12   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 399
Default Phone Charging

David Eather wrote on 11/20/2017 8:58 PM:
On Mon, 20 Nov 2017 17:39:34 +1000, rickman wrote:

Jeff Liebermann wrote on 11/19/2017 8:02 PM:
On Sun, 19 Nov 2017 17:27:10 -0500, rickman wrote:

A friend has an old Motorolla W376g phone and the charger can't be found.

Mini USB connector. You'll need to add a 200k resistor and short pins
2 and 4:


I just realized this connector resistor issue is not likely to be my
problem... I think. I can charge this phone using two generic adapters I
have. One is a box with six high current outputs, at least two rated for
2.1 amps and the other four rated for 1 amp or maybe 4 and 2 (other way
around). The other unit that will work with the phone is a car charger,
but then that one is also a high current charger. They are all connected
with the same cable and I'm pretty sure the charger end of the cable only
has four pins so there is no place to connect the resistor to the "ID" pin.

This phone won't charge from my laptop, so I don't think the phone is
negotiating anything over the USB data pins, or maybe it is? I don't
think either of the chargers have a USB host built in and the laptop
clearly does.

I'm still stumped.


Some usb leads for chargers only run the +5 and Gnd - so they can't be used
on PC's etc


I'm using the same cable in all cases. Only the PC has any smarts attached
and I'm not sure the phone even uses the data signals. The PC does make
some noises like it might be connecting to the phone though, but I suppose
it could be from the power drawn rather than the data signals. I don't know
how complex the USB port is in my laptop.

--

Rick C

Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
  #13   Report Post  
Posted to sci.electronics.design,sci.electronics.repair
external usenet poster
 
Posts: 331
Default Phone Charging

On 2017-11-21, David Eather wrote:

Some usb leads for chargers only run the +5 and Gnd - so they can't be
used on PC's etc


They can (but probably should not) be used for charing from PCs, but
cannot be used for data

--
This email has not been checked by half-arsed antivirus software
  #14   Report Post  
Posted to sci.electronics.repair
external usenet poster
 
Posts: 524
Default Phone Charging

Jasen Betts wrote:
On 2017-11-21, David Eather wrote:

Some usb leads for chargers only run the +5 and Gnd - so they can't be
used on PC's etc


They can (but probably should not) be used for charing


You mean 'sharing'? or 'charging'?

from PCs, but
cannot be used for data


If you meant to say 'sharing' and not 'charging' then yes, you can use this for a hard-wire data link. There are adapters for this too, I believe.
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Phone not charging Muddymike[_2_] UK diy 12 May 31st 12 06:04 PM
android spying software, Android Spy phone software, Blackberry ChatMessenger Logging, Reverse Phone Lookup , SMS spy, cell spy software, cellphone camera Video Logging, cell phone camera Picture Logging, mobile phoneEmail Logging, Smartphone Alex Rostov UK diy 1 March 10th 12 01:15 PM
Charging mobile phone Zen83237 UK diy 25 June 22nd 11 12:42 AM
Self charging cell phone battery bob Electronics Repair 15 April 17th 10 02:08 AM
Slighly OT -- Cell Phone Not Charging Steve Koschmann Metalworking 10 September 18th 05 01:00 AM


All times are GMT +1. The time now is 04:35 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"