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im not a pro at electronics but isnt it possible to solder a charging plug to a usb cable?
to achieve usb charging?
did it for a homemade IR headtracking unit
SmokeMasta said:
im not a pro at electronics but isnt it possible to solder a charging plug to a usb cable?
to achieve usb charging?
did it for a IR headtracking unit
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I still don't think people understand. This devices needs more output then a usb plug can produce. Think about it this way, would you charge your laptop computer off your desktop usb port? The XOOM requires a 12v charge, just like your laptop.
bwcorvus said:
I still don't think people understand. This devices needs more output then a usb plug can produce. Think about it this way, would you charge your laptop computer off your desktop usb port? The XOOM requires a 12v charge, just like your laptop.
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wont it be able to trickle charge... when in a pinch some charge is better then none at all
What don't people understand about this. A USB plug in a computer might only be able to produce 500ma, but you can plug that SAME USB cable into a wall charger that uses USB and it will charge fast as hell. The iPad does this. All Android phones do this. It makes it so you only have to carry one cable and maybe a small wall plug.
deleted this
bwcorvus said:
The usb port is not connected to the battery for charging anyway.
https://motorola-global-portal.cust...sion/L3RpbWUvMTI5ODgyOTM5NS9zaWQvdnpSbGhIbms=
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Click to collapse
guess you missed prev poster point ... if you solder on a charging plug it doesnt mean you need to remove the other plug have 2 plugs on one side
SmokeMasta said:
guess you missed prev poster point ... if you solder on a charging plug it doesnt mean you need to remove the other plug have 2 plugs on one side
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Click to collapse
You are right i miss read it
after some reading usb 3.0 delivers 900ma
and it looks those usb charger blocks deliver upto 9w at 1.8a
It is hard to say if it will work. Since I don't have my Xoom yet, I can looking at the output rating of the wall charger. Maybe someone can look at their wall charger and see how much output voltage and current it produces. If it's higher than 5V, the USB might not be able to charge it. If it could charge it, it would be better to have a USB cable that has one end split into two connectors, one with the circular connector, and one with the micro USB end.
ggoldfingerd said:
It is hard to say if it will work. Since I don't have my Xoom yet, I can looking at the output rating of the wall charger. Maybe someone can look at their wall charger and see how much output voltage and current it produces. If it's higher than 5V, the USB might not be able to charge it. If it could charge it, it would be better to have a USB cable that has one end split into two connectors, one with the circular connector, and one with the micro USB end.
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Click to collapse
Here you go.
looks like my usb 1.0 charger (from htc (ancient thing)) delivers 5v at 1amp
wondering if newer chargers deliver more. spec sheet of USB 3.0 says it can deliver 9 volt at 1.8 amp
hopefully the EU classifies the moto tablet as a telephone then its obligated by law to have usb charging ability
The iPad charger delivers 5v at 2 amps over a USB to 30pin cable.
bwcorvus said:
Here you go.
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Click to collapse
Thanks. I just decided to glance at the Xoom teardown. From what I saw with the hardware, I don't think it will be possible to use USB to charge it. The battery alone is 7.4V, so there is no way to charge it with 5V unless the Xoom had a DC step-up convert. The teardown only lists a step-down converter which probably steps the battery voltage down for all of the components in the Xoom and has nothing to do with battery charging.
ggoldfingerd said:
Thanks. I just decided to glance at the Xoom teardown. From what I saw with the hardware, I don't think it will be possible to use USB to charge it. The battery alone is 7.4V, so there is no way to charge it with 5V unless the Xoom had a DC step-up convert. The teardown only lists a step-down converter which probably steps the battery voltage down for all of the components in the Xoom and has nothing to do with battery charging.
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Click to collapse
Does it require the same voltage to do a trickle charge? From the research XDA members have done so far, the Xoom charger requires 1.5A, USB puts out .5A, that's not too far off if we just want trickle charging.
The battery is 7.4V but 5V isn't too far off either.
Does the market app SPARE PARTS work on the Xoom, or some other charging monitor app?
Maybe someone who already has the Xoom and knows how to solder can frankenstein a USB charging adapter? Make one end fit into the charging port of the Xoom and the other end fit into a standard micro USB plug.
This way, you carry your normal USB cable for data transfer but if you need to charge, then you plug the USB plug into the adapter which plugs into the charging port.
BTW, can someone please clarify that the charging port IS THE ONLY WAY to charge the Xoom? Someone said on here that the docking device has a USB plug that will charge the Xoom thru the USB?
Neo3D said:
Does it require the same voltage to do a trickle charge? From the research XDA members have done so far, the Xoom charger requires 1.5A, USB puts out .5A, that's not too far off if we just want trickle charging.
The battery is 7.4V but 5V isn't too far off either.
Does the market app SPARE PARTS work on the Xoom, or some other charging monitor app?
Maybe someone who already has the Xoom and knows how to solder can frankenstein a USB charging adapter? Make one end fit into the charging port of the Xoom and the other end fit into a standard micro USB plug.
This way, you carry your normal USB cable for data transfer but if you need to charge, then you plug the USB plug into the adapter which plugs into the charging port.
BTW, can someone please clarify that the charging port IS THE ONLY WAY to charge the Xoom? Someone said on here that the docking device has a USB plug that will charge the Xoom thru the USB?
Click to expand...
Click to collapse
Spare parts works fine, so does battery monitor widget. The dock uses the 2 metal pins between the hdmi and charging hole.
My HTC charger outputs from the AC adapter to microusb at 5V and 1.0A, which is as high as I've seen with other phones and chargers.
The Xoom charger appears to output 12V at 1.5A.
I'm no electrician but that does seem like a pretty big difference. 140% greater in and 50% greater respectively.
A lot of armchair electrical engineers in here. Tell me, what would you gain from creating your own proprietary usb charger? You'd still have only one of them and you couldn't use it on anything else.
Has anyone stopped to think that it's very highly likely that the usb charging pins aren't hooked up at all inside the xoom?
This forum is the biggest group of whiny people I've ever encountered, and I once accidentally walked into a GoP fundraiser.
Neo3D said:
Does it require the same voltage to do a trickle charge? From the research XDA members have done so far, the Xoom charger requires 1.5A, USB puts out .5A, that's not too far off if we just want trickle charging.
The battery is 7.4V but 5V isn't too far off either.
Does the market app SPARE PARTS work on the Xoom, or some other charging monitor app?
Maybe someone who already has the Xoom and knows how to solder can frankenstein a USB charging adapter? Make one end fit into the charging port of the Xoom and the other end fit into a standard micro USB plug.
This way, you carry your normal USB cable for data transfer but if you need to charge, then you plug the USB plug into the adapter which plugs into the charging port.
BTW, can someone please clarify that the charging port IS THE ONLY WAY to charge the Xoom? Someone said on here that the docking device has a USB plug that will charge the Xoom thru the USB?
Click to expand...
Click to collapse
Well the current rating is only part of the equation. Think of the voltage as the pushing force for the current. The Xoom has two Li-Po packs (two batteries) with a nominal voltage of 7.4V. It really depends on the battery, but in general for Li-Po's, the minimum voltage for this battery will be something close to 6V. Li-Po's require specific ways of charge with min/max voltages and certain currents. The minimum battery voltage cannot be overcome by the 5V from USB, thus it will not charge the battery.
If anything, the 5V could power the device, but it wouldn't charge the battery. I would bet that this doesn't work. The power jack on the Xoom probably goes into a regulator that reduces the 12V into a lower voltage that charges the Xoom.
gbenj said:
My HTC charger outputs from the AC adapter to microusb at 5V and 1.0A, which is as high as I've seen with other phones and chargers.
The Xoom charger appears to output 12V at 1.5A.
I'm no electrician but that does seem like a pretty big difference. 140% greater in and 50% greater respectively.
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Click to collapse
I don't see how you see it as whining, we're just figuring out how to get things we want ourselves instead of waiting for the manufacturer to do it for us
Most of XDA's reader probably have some kind of techincal/engineering/IT/industrial background. Nothing wrong with pooling our talents to solve manufacturers' shortcomings.
USB Charging
Just tried to charge it VIA USB and wall charger with USB port & this is the result.
So this is the first tablet\phone I've ever had that doesn't charge off the USB cable. Is there something I'm doing wrong or a wrong setting? I really don't want to carry the power brick when I travel.
Also, is there a way to disable the Kies so it doesn't make me press home every time I plug it in?
Xoom doesn't charge over USB either. Apparently the battery is to large and USB power to weak.
I've tried numerous computers and other USB power bricks and the only thing that seems to charge the tablet was the (rather huge) power brick that Samsung packed in the box.
yay pie said:
I've tried numerous computers and other USB power bricks and the only thing that seems to charge the tablet was the (rather huge) power brick that Samsung packed in the box.
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yeah I've tried ipad brick, kindle brick, etc. Not sure why they went so proprietary
I think most of these new tablets dont do usb charging. My xoom as well as my coworker's Asus Transformer doesn't do USB charging either.
The USB port doesnt provide enough juice to charge the device.
mystified said:
I think most of these new tablets dont do usb charging. My xoom as well as my coworker's Asus Transformer doesn't do USB charging either.
The USB port doesnt provide enough juice to charge the device.
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Click to collapse
It's a myth about usb ports not providing enough power. It's up to the device to either accept a trickle charge, or require the full power of the brick. Devices like iPad and iPad 2 are set to accept a slower charge. It's a poor customer experience to disallow charging from the laptop, because many people like me don't like to carry multiple power bricks when traveling.
you can charge it if you turn it off
I used this for my iPad 1 on Windows 7 and it also works for my 10.1 I/O. It doesn't say that it is charging but if u look at the battery chart u will see it charging while its on.
http://event.asus.com/mb/2010/ai_charger/
Sent from G2x
What is the voltage of the charger that comes with the 10.1"?
I know when I got my 7" Tab I purchased a higher voltage but standard nonetheless 2.1v USB charger which worked fine.
If the voltage is the same we should be able to use the small charger that comes with the 7" Tab (and cables as the pin connector I believe is the same).
Beards said:
What is the voltage of the charger that comes with the 10.1"?
I know when I got my 7" Tab I purchased a higher voltage but standard nonetheless 2.1v USB charger which worked fine.
If the voltage is the same we should be able to use the small charger that comes with the 7" Tab (and cables as the pin connector I believe is the same).
Click to expand...
Click to collapse
I can't see the difference between the Tab and the Tab 10.1 LE chargers. It's the same travel adapter and I have been using the original one for charging with the original cable.
cosimoss said:
I can't see the difference between the Tab and the Tab 10.1 LE chargers. It's the same travel adapter and I have been using the original one for charging with the original cable.
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Click to collapse
I thought as much.... Well that will save me having to purchase any additional power hardware items.
My Google I/O powers up, albeit slowly, over USB. Just a shame the USB cable connects to the Tab via the proprietary 30pin connection...
NZtechfreak said:
My Google I/O powers up, albeit slowly, over USB. Just a shame the USB cable connects to the Tab via the proprietary 30pin connection...
Click to expand...
Click to collapse
It does indicate that it is charging when it's switched off. I haven't bothered to see how long it takes.
I find this insane. I got a IO Tab from eBay and received it today and it is awesome except for the fact that I now have to go buy a US-UK adaptor for the charger as it doesn't work with any of my existing USB chargers including the iPad charger or charge from PC/Mac.
I also have the top right hand corner glass lifting up annoyingly which Engadget reported on. I have taped that corner up and will get it sorted under warranty when its officially out I hope.
I have seen a USB adapter in Amazon which says it will connect the USB with any charger. I ordered one and will hopefully see soon if with this small item I can use my car adapter and the one from Nikon, Nokia, and and and
USB charger from smaller Galaxy tab works. You can order them on amazon.com or ebay.
Just to confirm, Tab charges over USB when the screen is set to off.
But I agress, USB socket sucks.
fscherz said:
I have seen a USB adapter in Amazon which says it will connect the USB with any charger. I ordered one and will hopefully see soon if with this small item I can use my car adapter and the one from Nikon, Nokia, and and and
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Click to collapse
I bought an adapter off eBay that was quoted as being for the P1000. It works just fine on the 10.1v charging off USB, even when the screen is on. It charges quite quickly too.
It is a small USB cable that has a switch that allows you to put the cable in data or charge mode. I found that I had to disconnect the cable prior to switching modes for it to play nice however.
mystified said:
I think most of these new tablets dont do usb charging. My xoom as well as my coworker's Asus Transformer doesn't do USB charging either.
The USB port doesnt provide enough juice to charge the device.
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Click to collapse
Actually the Asus Transformer does do usb charging in sleep mode. Little known feature although it says so on the quick guide slip you get in the box....
Yes it does charge, but only when the device is powered off, or the screen is powered off (sleep)
It won't charge over an apple connector, because they aren't keeping to the standard at all (as usuall) Samsung is also using a slightly altered version of the connector, but the charger, audio channels en video channels are in the right place
Just google/wiki on the 30-pins connector schematics
Sent from my GT-P7100 using XDA Premium App
I've been experimenting with the power options on the Galaxy Tab 10.1 and I think I have it figured out:
1. You get full charge rate, even with the screen on, only when using the Samsung power adapter.
2. An iPad adapter with a similar output as the Samsung adapter (they're stronger for tablets than phones) does not charge it at the same rate as the Samsung adapter. The iPad adapter charges at the same rate as #3 and #4.
3. USB into the computer trickle charges the GT. On mine at about a rate of 4% an hour.
4. A standard iPhone adapter charges the same as #3.
I'm a little disappointed that the iPad adapter didn't work, that makes me think that there's something in the Samsung adapter that isn't standard (if the iPad adapter is standard, maybe it isn't).
I decided to put the included adapter at my bedside and keep it plugged in to my computer throughout the day by USB. The short USB cable is restrictive, but I have some longer ones coming from Amazon tomorrow. They were less than half the price of the Samsung cable too.
Did anyone else have a different experience?
I use the adapter that came with the GT10.1, set it to Flight mode and put it to sleep as it charges.
Estimated 5-6 hours to full charge from around 30% since I've never really gotten the battery lower than that for an entire days full usage through uni... not even a FULL full day of uni where i use it from 9am to 7pm does it dip below that.
majkeli said:
I've been experimenting with the power options on the Galaxy Tab 10.1 and I think I have it figured out:
1. You get full charge rate, even with the screen on, only when using the Samsung power adapter.
2. An iPad adapter with a similar output as the Samsung adapter (they're stronger for tablets than phones) does not charge it at the same rate as the Samsung adapter. The iPad adapter charges at the same rate as #3 and #4.
3. USB into the computer trickle charges the GT. On mine at about a rate of 4% an hour.
4. A standard iPhone adapter charges the same as #3.
I'm a little disappointed that the iPad adapter didn't work, that makes me think that there's something in the Samsung adapter that isn't standard (if the iPad adapter is standard, maybe it isn't).
I decided to put the included adapter at my bedside and keep it plugged in to my computer throughout the day by USB. The short USB cable is restrictive, but I have some longer ones coming from Amazon tomorrow. They were less than half the price of the Samsung cable too.
Did anyone else have a different experience?
Click to expand...
Click to collapse
Now it's the good time to send your finding to the German judge and explain him that Apple is a troll company. ;-)
Coming back to your question, no man. But please do post your findings.
Sent from my GT-P7510 using XDA Premium App
It's the different pin-out between the Samsung charger and the Apple charger...Samsung shorts different pins on the charger to tell the Tab it's getting full power. You can buy an adaptor (see Accessories section) that will fool the Tab.
Once the pins are shorted, 2A is 2A, far as the Tab is concerned, and it will charge faster.
Croak said:
It's the different pin-out between the Samsung charger and the Apple charger...Samsung shorts different pins on the charger to tell the Tab it's getting full power. You can buy an adaptor (see Accessories section) that will fool the Tab.
Once the pins are shorted, 2A is 2A, far as the Tab is concerned, and it will charge faster.
Click to expand...
Click to collapse
btw: you can get very cheap adapters for that on amazon/ebay!
Croak said:
It's the different pin-out between the Samsung charger and the Apple charger...Samsung shorts different pins on the charger to tell the Tab it's getting full power. You can buy an adaptor (see Accessories section) that will fool the Tab.
Once the pins are shorted, 2A is 2A, far as the Tab is concerned, and it will charge faster.
Click to expand...
Click to collapse
Thanks for the info! I guess I'm a little late to the party with the GT.
majkeli said:
I've been experimenting with the power options on the Galaxy Tab 10.1 and I think I have it figured out:
1. You get full charge rate, even with the screen on, only when using the Samsung power adapter.
2. An iPad adapter with a similar output as the Samsung adapter (they're stronger for tablets than phones) does not charge it at the same rate as the Samsung adapter. The iPad adapter charges at the same rate as #3 and #4.
3. USB into the computer trickle charges the GT. On mine at about a rate of 4% an hour.
4. A standard iPhone adapter charges the same as #3.
I'm a little disappointed that the iPad adapter didn't work, that makes me think that there's something in the Samsung adapter that isn't standard (if the iPad adapter is standard, maybe it isn't).
I decided to put the included adapter at my bedside and keep it plugged in to my computer throughout the day by USB. The short USB cable is restrictive, but I have some longer ones coming from Amazon tomorrow. They were less than half the price of the Samsung cable too.
Did anyone else have a different experience?
Click to expand...
Click to collapse
Read the "make your own cables" thread for more on charging and such.
Various "dumb chargers" use different methods to signal the presence of a "dumb charger".
The official USB-IF standard is to short D+ and D- together.
The Apple way is all sorts of weird resistors to set voltages on D+ and D-. iPad is 2.0 and 2.8 volts.
The Samsung tablet way is to short them together and use resistors to make them wind up at 1.2 volts approximately.
I tried swapping out the USB cable that came with my nexus 7 with a longer usb cable (still using the same charger though edit: by that, i mean the ASUS charger that came with the N7). It doesn't seem to be charging though, even though it says 'charging' on the screen. When i was using the nexus 7 while plugged in, i actually lost 1% charge after using it for like 30 or so minutes.
I think i grabbed this cable off Ebay. It had no trouble charging my phone. Are there different grades of USB cables or something?
By same charger do you mean the one it came with? The 2 amps charger. Sorry I had to clear that bit up. I think longer cables creates more resistence but I'm not sure if the cable length is significant enough stop charging. I have no idea about grades of USB cables though maybe someone can elaborate on that.
Summerfly said:
By same charger do you mean the one it came with? The 2 amps charger. Sorry I had to clear that bit up. I think longer cables creates more resistence but I'm not sure if the cable length is significant enough stop charging. I have no idea about grades of USB cables though maybe someone can elaborate on that.
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Click to collapse
Yes, the ASUS charger it came with, i plugged in the 6 foot microusb cable i bought off ebay into it.
MFister said:
Yes, the ASUS charger it came with, i plugged in the 6 foot microusb cable i bought off ebay into it.
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Click to collapse
Okay, 6 foot cable doesn't sound excessively long. I have to ask what were you doing on it while charging and what brightness setting was the screen at. Maybe you were draining more power than the charger can provide?
This is pretty common. The stock cable has larger conductors, as I assume other 2 amp chargers come with, and standard cables are sensed somehow and charging current is limited. Try finding a 22awg cable, I think it will work.
I use a USB extender since I don't have any outlets near my bed. I use a cable rated for USB 2.0 and haven't had any problems. I have had problems with cables that aren't. The Motorola USB cables are rated for 2.0 and they all work fine for me with no problems.
burpootus said:
This is pretty common. The stock cable has larger conductors, as I assume other 2 amp chargers come with, and standard cables are sensed somehow and charging current is limited. Try finding a 22awg cable, I think it will work.
Click to expand...
Click to collapse
Thanks, i assume this cable that's 28/24 awg would work?
http://www.monoprice.com/products/p...=10303&cs_id=1030307&p_id=8643&seq=1&format=2
I use a cable extender, but I insert the original stock cable into the tablet (not the charger). It appears to recognise that and charge at the correct rate.
I've tried using a usb extender to charge with the asus charger and the Asus USB cable and checking with battery graph it charges much slower compared to using just the Asus cable.
People with eyesight better than mine will see that the micro USB socket has 5 pins and the Nexus looks at the 5th pin to decide what is connected and what the connected device is allowed to do. The pin can be grounded, not connected (floating) or can be connected to ground via I think 3 fixed resistances. Google for USB on the go. I think that is the standard adopted by Asus and the cable doesn't comply.
I'm using a nook 1/2 cable I got with a car charger for the nooktablet
It works and is longer then the stock cable it came with.
Sent from my Nexus 7 using Tapatalk 2
EE here. I just ran into this issue recently, so I'll share what I learned. Grab a multimeter and measure the resistance of the cable. Check all 4 pins just in case one of them is worse than another.
In my case, I had a really horrible USB extension cable. It measured about 4 Ohms. 4 Ohms is low enough for a multimeter to pass a continuity test, but do out the math:
V = I * R
V = 2A * 8 Ohms (4 Ohms on VCC, 4 Ohms back on GND)
V = 16V.
16 volts?? Where does 16V come from? Short answer: It doesn't. If 2A were actually flowing, the USB cable would have a 16V drop across it. It doesn't though, which tells us that 2A is not flowing. 1A is also not flowing, since that would still be 8V.
0.5 Ohms is a good estimate for a MAXIMUM resistance for a USB charging cable. That's a 1V drop at 2A, meaning the phone is only getting ~4V. That explains why the USB cable that comes with the Nexus 7 is so darn short - it comes in at around 0.1 Ohms (or perhaps less, that's about the limit of what I can accurately measure)
Wanted to get a longer USB cable that will work the Asus adapter, any links?
Thanks.
came across this thread while investigating a strange thing in charging my 4400mah extended battery of my s3.
I have a 5v 1A stock samsung charger with an extension cable i was always using to charge my old phones with a less capacity battery (mugen 3200mah)
This night i spent i wasnt ble to get a full charge from 5% to 100% in 8 hours and this sounds more than strange, but yet understandable.
i will try timings with the stock cable without extension and i'll come back...
Little help chaps.
Ok i've just bought this http://www.ebay.co.uk/itm/390566738301
I presumed (not sure if rightly or wrongly) that it would be sufficient to charge my Nexus 4
I'm using an older usb cable I've got to charge it in my car however if i'm using navigation then the battery still decreases.
I've got a funny feeling that the cable is the culprit but i'm not 100% sure.
Is there anyway to monitor how much juice your phone is getting from the charge?
P.S in the battery monitor screen it says AC not USB
Thanks in advance for any help
Stret
Battery monitor widget pro. It monitors the mA that's being used, mV, etc. Maybe the phone is pulling more mA than the charger is supplying.
You need to go into your battery settings/status while your phone is plugged into your car charger.
It will show one of two statuses:
Charging(AC) and Charching(USB)
If it is showing charging(USB), then the phone is detecting a false data connection. This can be solved by taking apart your USB charger and soldering the middle two pins of the USB. These pins are the Data(+) and Data(-) pins. I attached an image of the two Data pins soldered together on the usb charger.
If it is showing Charging(AC), then your USB charger is not pushing enough mA to charge your phone. Most cheap car USB chargers are in the 500 mA to 700 mA range. The stock USB wall charger that comes with your Nexus 4 is 5V 1200mA.
t989BeLikeItDo said:
You need to go into your battery settings/status while your phone is plugged into your car charger.
It will show one of two statuses:
Charging(AC) and Charching(USB)
If it is showing charging(USB), then the phone is detecting a false data connection. This can be solved by taking apart your USB charger and soldering the middle two pins of the USB. These pins are the Data(+) and Data(-) pins. I attached an image of the two Data pins soldered together on the usb charger.
If it is showing Charging(AC), then your USB charger is not pushing enough mA to charge your phone. Most cheap car USB chargers are in the 500 mA to 700 mA range. The stock USB wall charger that comes with your Nexus 4 is 5V 1200mA.
Click to expand...
Click to collapse
Yeah it definitely shows AC was the first thing I checked, so what your saying is that link o posted above is actaully a false claim to how much power it knocks out?
Stret
Stretlow said:
Yeah it definitely shows AC was the first thing I checked, so what your saying is that link o posted above is actaully a false claim to how much power it knocks out?
Stret
Click to expand...
Click to collapse
Hard to say. From my experience, you get what you pay for. A USB charger that cost less than 2 GBP seems unlikely to support the kind of mA throughput that the Nexus 4 requires.
Some ways to check this are to check the power supply and draw through a battery monitoring app, use a different USB cable or the USB cable that came with your Nexus 4, or take apart the USB charger and inspect the hardware to see if it actually is built to support a 2A supply. That last one is a bit of a headache.
Here is an iFixit teardown of a similar USB charger which goes into detail about some of the working parts of a car USB charger.
To quote the final part of the iFixit teardown:
Quite simply, the device is a rebadged 500mA or 750mA USB charger at best. It is NOT 1A capable, despite what the sticker on the body says.
Click to expand...
Click to collapse
Good luck!
t989BeLikeItDo said:
Hard to say. From my experience when it goes about this type of gear is that you get what you pay or. For a USB charger that cost less than 2 GBP it seems unlikely that it would support the kind of mA throughput that the Nexus 4 requires.
Some ways to check this is to check the power supply and draw through a battery monitoring app, use a different USB cable or the USB cable that came with your Nexus 4, or take apart the USB charger and inspect the hardware to see if it actually is built to support a 2A supply. That last one is a bit of a headache.
Here is an iFixit teardown of a similar USB charger which goes into detail about some of the working parts of a car USB charger.
Good luck!
Click to expand...
Click to collapse
Thanks for your help mate
Stretlow said:
Thanks for your help mate
Click to expand...
Click to collapse
No problem! You should try and remember that the Nexus 4 is a pretty sophisticated piece of hardware. I'm not advocating that you go out and spend 20 GBP on equipment, but you don't want to use a cheap generic piece of trash to interface that electrical connection. The build quality of your charger can put your handset at risk to being damaged by electrical shorts and/or heat.
I would liken it to parking your sports car in a cheap parking garage on the bad side of town. Sure, you can do it, but there are risks involved!