Develop Bugs

Anyone else have issues charging via computer USB?

I seem to have an issue that my phone never charges whilst connected via USB to my Macbook Pro. I have also tested on a Windows machine and have the same issue.
I was able to charge my Sensation over USB and I know that one of the ports on the Macbook has a higher output for charging but it makes no difference.
The phone states that it is charging but the percentage charge continues to drop. If I switch the power off it will charge. There doesn't appear to be any big battery drains though. I ran for a day and twelve hours over the weekend and charged at 40 percent.
Has anyone else the same issue?
Btw, I am on stock 4.0.2, rooted but not running anything else that should have any affect
Sent from my Galaxy Nexus using Tapatalk

How old is your macbook pro? Or more to the point, do you know if it has USB 3.0 ports? If your higher output ports are just 2.0 (and your computer is describing them as such compared to the older 1.0 spec) then you are stuck at 0.5A (half of wall charger output). USB 3.0 goes up to 0.9A, but I don't know if there are any catches in terms of devices needing to request the bump.
When you say that it charges if you switch the power off, do you mean it only works if you actually power down the phone? As in, leaving it sleeping plugged in, it still won't charge? Keep in mind that actively using the phone with the brightness turned up high could result in overpowering the .5A current in.
Unless you know someone else with a GN you can test you might just want to take it into the store and have them try it there/consider a replacement if it's defective. Also worth exploring if it's just the battery is defunct, if you have access to another one.

aidanbree said:
I know that one of the ports on the Macbook has a higher output for charging but it makes no difference.
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Really? Source?
Doing a tad of research it seems some models front (closer to the front) USB port has slightly higher output than the back (closer to the screen) USB port because the back one shares a USB controller with internal components.
It couldn't be noticeable though, they're both simply rated at .5A .
Has anyone else the same issue?
Btw, I am on stock 4.0.2, rooted but not running anything else that should have any affect
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I charge my 4.0.2 stock GSM Nexus off of my MacBookPro almost every night without issues. Using both an HTC cable and the Samsung cable.
JoeSyr said:
How old is your macbook pro? Or more to the point, do you know if it has USB 3.0 ports?
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MacBooks don't have USB 3.0. Its always been standard USB 2.0 afaik.
I'd also recommend that OP check different cables and computers, or different batteries if possible.

I have the exact issue. If I charge via USB on ANY laptop/computer it takes forever and if I'm using the phone as it's charging it uses more power than being supplied so it loses battery life even though it's plugged in.
I had this problem on my iPad too. It seems they need more power to charge but can still "trickle" charge off of a standard USB port.
My batter was at 10% last night, plugged it in to my laptop and sent some texts and left the display on (dev settings), about 10 min. latter it was at 4%.

I mean to post this last week!
See the screenshot....Status 'Charging' however as you see from the lower part of the screen, it has clearly stopped charging some time ago (about 3 hours earlier!)
It turns out that the CABLE was the issue....I thought all Micro USB cables were created equal, evidently not
Any ideas what the differences are in micro USB cables and how to identify which ones 'work' and which don't? I bought 10 from ebay which all seem not to charge from USB

I've had no problems charging via my pc using Samsung or Motorola cables. It charges slower but it still works.

Battery Drains while playing video via MHL/HDMI connected to mains.

Hi guys,
I have a simple MHL connector (ie splits into power & hdmi), to hookup the phone to the big screen. It looks pretty decent, but even when connected to mains, (which it must have otherwise hdmi doesnt work), it loses charge while playing video.
I have tried several players (dice / mx).. all play well, but phone cant keep up with charging & playing at same time..
Am doing some tests to see how bad it draws. When I go into system details, phone shows it is charging via mains.. but it appears it cant put out enough current to charge and play..
Would make a LOT of sense to me that the LCD screen (which draws about 70% of the power) actually switched off during playback via HDMI.
anyone know if this is possible or if they can charge & play a video at the same time..
I seem to be losing about 1% battery every 2 mins.
Can someone else test so i can know if It is just a dodgy MHL I have or if they are all like this. Have tried both SD & HD video.. all quite similar results.

be aware
Use the original charger or one with 5v 1a otherwise your phone won't get enough power for example I know a BlackBerry charger has a lower output

Crabitpig said:
Use the original charger or one with 5v 1a otherwise your phone won't get enough power for example I know a BlackBerry charger has a lower output
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Click to collapse
This was with the original charger unfortunately.

This is the same issue why I wrote that One X is unusable for in-car navigation. Basicaly what happens when under load (navigation, playing a movie, playing a game) is that battery gets into "Overheat" state (you can see this in OS Monitor for example) and stops charging.
My test for car navigation shows that power is drained by 25%/hour when plugged in and Sygic is running. Battery is in overheat state most of the time. This happens at about 50 deg.C if I remember correctly - this looks a little low so maybe they'll tweak it a little, but it doesn't solve the underlying problem really, just delays it...
So I blame crappy heatsink construction or overral internal design, this should not happen under any circumstances (and my iPhone is a marvellous example that it can be done - it is able to navigate and charge at the same time, and gets into overheat only when car ventilation is turned off and sun is shining on its' black body - my One X is white and overheats no matter what I do).
This will sooner or later be the reason why people will start returning their phones en masse...

Get 2 amps charger from eBay, see if it helps. I do have one, but only use it when I really need a quick charge in very shor time. Not advised to use as primary charger, but for powering both: phone and MHL at the same time, it might just do the trick.

schriss said:
Get 2 amps charger from eBay, see if it helps. I do have one, but only use it when I really need a quick charge in very shor time. Not advised to use as primary charger, but for powering both: phone and MHL at the same time, it might just do the trick.
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I tried this, doesn't work. The problem is not insufficient current, it's overheating.

schriss said:
Get 2 amps charger from eBay, see if it helps. I do have one, but only use it when I really need a quick charge in very shor time. Not advised to use as primary charger, but for powering both: phone and MHL at the same time, it might just do the trick.
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zvieratko said:
I tried this, doesn't work. The problem is not insufficient current, it's overheating.
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2a won't work as the phone is limited to 1a
If the battery temp is 48 or over it goes in to overheat state green and red notification.
If you are rooted you could disable two cores see if that helps.
Sent from my HTC One X using xda premium

This same issue came up in the Nexus forums a while back. Evidently, AC charging requires that the USB data lines to be either shorted or have a resistor across them (forget which one). Since MHL is using those USB data lines for video, they cannot be used to signal AC charging capability, so you're stuck with the max USB draw of 500ma. That's way less than the amount of juice you're using, so you end up running the battery down. You should be able to confirm that by noting the charging mode displayed while using MHL.
Sent from my Galaxy Nexus using xda premium

Slow Charging

When I plug in my power adapter to charge the tablet more often now I get the Slow Charging notification that says battery is charging slowly due to low electric current of TA/USB connection. Any one else seeing this? I am using the stock charger supplied with the tablet. I have tried this on several AC outlets in several different locations. It does not seen to affect the ability to charge the tablet it just charges it a little slower.

MarkLI88 said:
When I plug in my power adapter to charge the tablet more often now I get the Slow Charging notification that says battery is charging slowly due to low electric current of TA/USB connection. Any one else seeing this? I am using the stock charger supplied with the tablet. I have tried this on several AC outlets in several different locations. It does not seen to affect the ability to charge the tablet it just charges it a little slower.
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i havent experienced this message except for when i connect the tablet to the pc where the electric current is indeed low

katsika said:
i havent experienced this message except for when i connect the tablet to the pc where the electric current is indeed low
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Thanks for the reply. I am starting to think my power adapter is not putting out the correct current it should be. I will try using a different 2A charger and see how it goes.

MarkLI88 said:
Thanks for the reply. I am starting to think my power adapter is not putting out the correct current it should be. I will try using a different 2A charger and see how it goes.
Click to expand...
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You might also try a different cord!

You may try to install "battery monitor widget", it will tell you charging in USB mode or AC mode.
I also find the stock LG charger slow charging, the widget shows I'm only charging at around 1100mA max. While the charger itself label said Output 1.8A max. I can't reach this level yet.
If I charge with a stock nexus 7 charger (which is 2A rated), it'll get worse...just reach around 800mA max.
I'm still not sure what's wrong with the charger or the tablet itself...

I can say that the cable that came with the gpad does charge faster than a thinner cable I had. Both were tested plugged into the stock LG charger.
Sent from my LG-V500 using XDA Premium HD app

When I pulled my g pad out of the box and saw the stock charger was below 2A I put it back in the box. I charge my tablet with the 2A charger that my note 2 uses.

I've seen this problem intermittently with the stock LG charger and today it seems to have become a permanent fault. Swapping to my Note 3 charger things are back to normal once more. Swapping back and forth repeatedly the LG charger triggers the warning and the Note charger is fine. It looks like the LG charger is a bit rubbish. I'll press for a warranty replacement.

I have noticed mine recharges really slowly as well. Using the stock charger, and the battery app previously mentioned, it gives me about 1.1A from the stock charger. Using my Vita charger rated at 1.5A I get about 1.4 into the G Pad. It seems their charger just stinks.
I sent them a support query to see if they will replace it without hassle, if they want me to send it back I'll just buy something else instead.
Edit: Heard back from LG, they want me to send the whole thing back to them or return it to Newegg. Not sure why they won't just ship me a replacement charger, it would be much cheaper for them in the long run.

tdodd said:
I've seen this problem intermittently with the stock LG charger and today it seems to have become a permanent fault. Swapping to my Note 3 charger things are back to normal once more. Swapping back and forth repeatedly the LG charger triggers the warning and the Note charger is fine. It looks like the LG charger is a bit rubbish. I'll press for a warranty replacement.
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Click to collapse
Further investigation revealed the original cable to be at fault, as it would not make a data connection with either of my laptops. Another cable from my old Galaxy Note worked perfectly. Even so there is still a question mark about the charger as well. Today I spoke to an LG support rep who promised to send a new charger and cable. They should arrive within five working days. I had read of mixed opinions on LG's support, but so far it all seems encouraging.

[Q] LG Optimus G E973 Charging Time Issue

Hi Everyone.
I have a question about my used phone LG Optimus G E973. It charge very slowly. It always take about 6 hours for a full charge. If I use the phone, the charging percentage won't go up but go down slowly even if It is being charged.
Is it normal for this model?

Rexkh said:
Hi Everyone.
I have a question about my used phone LG Optimus G E973. It charge very slowly. It always take about 6 hours for a full charge. If I use the phone, the charging percentage won't go up but go down slowly even if It is being charged.
Is it normal for this model?
Click to expand...
Click to collapse
change the charger,.... mine too takes 6hrs on lg charger.. am using .5amp rated charger of lumia 520 .. it charges it in 2:30

I don't think because of charger. I use the same charger with my iPhone and it charge very quick.

Rexkh said:
I don't think because of charger. I use the same charger with my iPhone and it charge very quick.
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its becaus of that usb cable..... try different usb cable with same charger and it charges quickly.. :good:

krishnanmailbox1 said:
its becaus of that usb cable..... try different usb cable with same charger and it charges quickly.. :good:
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I did, still slow. I guess it my phone. I just want to make sure that all phones of this model are the same or just me.

Rexkh said:
I did, still slow. I guess it my phone. I just want to make sure that all phones of this model are the same or just me.
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Since the iphone has a different battery, the charger is also different.
To make sure your battery doesn't die, I suggest you use an LG charger, or at least a charger for a phone with the same amount of mAh on the battery (2100, in this case)

howaboudno said:
Since the iphone has a different battery, the charger is also different.
To make sure your battery doesn't die, I suggest you use an LG charger, or at least a charger for a phone with the same amount of mAh on the battery (2100, in this case)
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I've been using LG Charger to charge my LG phone. It's already the same model. And you? Do you have the same model as mine?

Rexkh said:
I've been using LG Charger to charge my LG phone. It's already the same model. And you? Do you have the same model as mine?
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I own the E975, which is slightly different, but the specs are the same and I have not run into this problem before. So I'm guessing it's an error in either the USB-cable or the phone's battery. I'm not sure though.

howaboudno said:
I own the E975, which is slightly different, but the specs are the same and I have not run into this problem before. So I'm guessing it's an error in either the USB-cable or the phone's battery. I'm not sure though.
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Too bad. So there is something wrong with my phone. Is your main power 110V or 220V? The power in my place is 110V. Sometime I get message "Slow Charging" when I connect my phone to the charger.

Rexkh said:
Too bad. So there is something wrong with my phone. Is your main power 110V or 220V? The power in my place is 110V. Sometime I get message "Slow Charging" when I connect my phone to the charger.
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I did a little research (I googled it) and that might just the cause of your problem. Many people have said that charging on a 110v outlet is not only slower but also less efficient. To charge your phone faster with a lower voltage oulet, they recommend to buy a charger that is specially made for that voltage, but that might not be a problem since also my charger (LG charger) supports voltages from 100V up to 240V.
"In a very layman terms, voltage is what drives the real power (amperes) into your device. So the lower your voltage as per specified rating then the lower the movement of power to your device.
However, when power moves slowly into your device, it stays longer"
I hope this gives you enough information concerning your problem

Sound like I'm lucky to have a phone which can be charged slowly. How many percents you get if you charge your phone for 15 minutes?

howaboudno said:
I did a little research (I googled it) and that might just the cause of your problem. Many people have said that charging on a 110v outlet is not only slower but also less efficient. To charge your phone faster with a lower voltage oulet, they recommend to buy a charger that is specially made for that voltage, but that might not be a problem since also my charger (LG charger) supports voltages from 100V up to 240V.
"In a very layman terms, voltage is what drives the real power (amperes) into your device. So the lower your voltage as per specified rating then the lower the movement of power to your device.
However, when power moves slowly into your device, it stays longer")
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Click to collapse
I am sorry in advance, my comment is not directed at you personally, since you found this info online...
This is a complete and utter nonsense. It's not even funny, it's just dumb. First off, auto-sensing chargers will work with any AC mains within standard tolerances. 110V, 120V, 220V, 240V -- doesn't matter at all, the charger will output stabilized 5VDC, and will supply the current (Amps) up to its rated maximum. Also, saying that the voltage drives the amps is another BS. The voltage in this case doesn't change -- it stays at 5V (unless you have a crappy or defective charger, of course). Only the charging circuit in the phone determines the current that it draws from the charger.
Speaking of the OP's problem, there might be different reasons for a slow charge. All of them have already been mentioned in this thread. The easiest thing to check is to change the USB cable. Speaking from experience, I have two particular cables that consistently exhibit this issue -- it all depends on the conductors (wires) and the quality of connections. Grab another cable, and see what happens. Next step would be to change the charger for something rated higher (2A, for example). I am 99% sure either of these replacements will fix the issue. If neither of these things work, then there may be a problem with the battery, which can be replaced. The worst-case scenario is a problem with the phone itself (highly unlikely)...

kt-Froggy said:
I am sorry in advance, my comment is not directed at you personally, since you found this info online...
This is a complete and utter nonsense. It's not even funny, it's just dumb. First off, auto-sensing chargers will work with any AC mains within standard tolerances. 110V, 120V, 220V, 240V -- doesn't matter at all, the charger will output stabilized 5VDC, and will supply the current (Amps) up to its rated maximum. Also, saying that the voltage drives the amps is another BS. The voltage in this case doesn't change -- it stays at 5V (unless you have a crappy or defective charger, of course). Only the charging circuit in the phone determines the current that it draws from the charger.
Speaking of the OP's problem, there might be different reasons for a slow charge. All of them have already been mentioned in this thread. The easiest thing to check is to change the USB cable. Speaking from experience, I have two particular cables that consistently exhibit this issue -- it all depends on the conductors (wires) and the quality of connections. Grab another cable, and see what happens. Next step would be to change the charger for something rated higher (2A, for example). I am 99% sure either of these replacements will fix the issue. If neither of these things work, then there may be a problem with the battery, which can be replaced. The worst-case scenario is a problem with the phone itself (highly unlikely)...
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Guess I really shouldnt trust the internet that much, huh? Haha
But yeah that was the first thing I thought which caused the problem
Thanks for pointing out my mistakes

howaboudno said:
Guess I really shouldnt trust the internet that much, huh? Haha
But yeah that was the first thing I thought which caused the problem
Click to expand...
Click to collapse
Well, explanations like those you quoted could be reasonable to some extent only if you have a really bad charger (either broken/defective, or just made like crap to begin with). I am talking about properly designed and functioning chargers. I have a wonderful example of a cutting-edge engineering from China sitting in my desk drawer: it's a microUSB car charger, which has direct connections from a 12VDC socket to microUSB pins, protected by a 5Amp fuse. Oh, and a cute red LED light, of course. :silly: When something like this is used, anything can happen... If a phone survives, it could be a good advertising for a phone's manufacturer: "Our phones work no matter how hard you try to kill them!"

As I already mentioned, I think it's neither charger nor cable problem. How do I guess that? Well,
1st, I charge my iPhone with iPhone cable and "A" charger. It charge very quick so "A" charger shouldn't be a problem
2st, I charge my iPhone with iPhone cable and LG Charger. It charge very quick so LG Charger shouldn't have problem.
3rd, I charge another android phone with "A" cable and "A" charger. It charge very quick so "A" cable has no problem.
4th, I charge my LG Optimus G E973 with "A" cable with LG charger. The charge is very slow.
Therefore, I guess, none of the accessories have any problem so I think I'm the only one in the world who have this problem.

Rexkh said:
As I already mentioned, I think it's neither charger nor cable problem. How do I guess that? Well,
1st, I charge my iPhone with iPhone cable and "A" charger. It charge very quick so "A" charger shouldn't be a problem
2st, I charge my iPhone with iPhone cable and LG Charger. It charge very quick so LG Charger shouldn't have problem.
3rd, I charge another android phone with "A" cable and "A" charger. It charge very quick so "A" cable has no problem.
4th, I charge my LG Optimus G E973 with "A" cable with LG charger. The charge is very slow.
Therefore, I guess, none of the accessories have any problem so I think I'm the only one in the world who have this problem.
Click to expand...
Click to collapse
your phone usb port might be a defective one lol

My LG E975 used to charge frustratingly slow when I first bought (20 percent over 3 hours). Before taking it to warranty, I did test around to see what's the problem and found it was because of the cable. Some cables work better than the others though. I used the LG charger with the cable of my Sony phone -> still slow; with Asus tablet cable -> working normal (1 percent up every 1 - 1,5min).
Further testing, I used the "faulty" LG cable to charge my Asus tablet, and it worked fine. So (I guess) the USB port of the phone is just being picky on cables . Try charging with some other cables for a few minutes to see if any works for your phone.

any way to change the currents charging voltage in kernel? i have this issue with CM11 but not on stock

[Q] High-pitched whining noise while plugged into charger

I have a rooted stock 4.4.2 Nexus 7, and I'm encountering a really weird problem where there's a persistent high-pitched whining noise that seems to come out of the speakers whenever it's plugged into a wall charger. I tried the stock charger + cable that came with my device as well as 2 other third-party chargers all with the same results. Meanwhile, charging it via USB connected to my computer doesn't produce that sound at all.
Does anyone know if there are any tweaks or settings that could be causing this? I looked in the FAQ, and I only see a giant thread about static while at low volumes, but this looks to be a completely separate problem since it's unrelated to volume settings & it happens when I have no sound playing at all. Googling this returns a bunch of results with people's chargers making noises, but not the Nexus 7 itself.
If anyone else has had this problem and can offer any insight, that'd be appreciated. It's not the biggest deal in the world, since I just have to make sure I'm not in the same room when it's charging so I don't get annoyed, but if I can fix it, that'd be great.

tarotsujimoto said:
If anyone else has had this problem and can offer any insight, that'd be appreciated. It's not the biggest deal in the world, since I just have to make sure I'm not in the same room when it's charging so I don't get annoyed, but if I can fix it, that'd be great.
Click to expand...
Click to collapse
Maybe a ground loop. Can you ground your tablet and see if that helps. Just a theory at the moment.
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app

LinearEquation said:
Maybe a ground loop. Can you ground your tablet and see if that helps. Just a theory at the moment.
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Click to collapse
Sorry for the dumb question, but to ground it, just have it touching metal?
Also, a new piece of information: I found that the noise only happens when the tablet is fully charged (100%) and still plugged in, so it happened last night while I left it in to charge after going out. I'll have to wait for it to fully charge again before I can test this theory today.

tarotsujimoto said:
Sorry for the dumb question, but to ground it, just have it touching metal?
Also, a new piece of information: I found that the noise only happens when the tablet is fully charged (100%) and still plugged in, so it happened last night while I left it in to charge after going out. I'll have to wait for it to fully charge again before I can test this theory today.
Click to expand...
Click to collapse
Not an extra ground, isolate the ground. Make sure the tablet and charging brick are grounded well. Is your outlet/house grounded well? Can you use an outlet with nothing else plugged into that line?
You say this only happens when fully charged and not until? I wonder if there is a problem with the battery perhaps over charging. Have you switch charging bricks? Switched cords? Does the charging brick get warm? How about the back of the tablet?
Edit: Are you using the official cord and charging brick? That can make a difference. If not what are the specks of the brick you are using?
Sent from my Nexus 7 Flo running CM 11 4.4.2 with ElementalX Kernel using XDA Premium 4 mobile app

LinearEquation said:
Not an extra ground, isolate the ground. Make sure the tablet and charging brick are grounded well. Is your outlet/house grounded well? Can you use an outlet with nothing else plugged into that line?
You say this only happens when fully charged and not until? I wonder if there is a problem with the battery perhaps over charging. Have you switch charging bricks? Switched cords? Does the charging brick get warm? How about the back of the tablet?
Edit: Are you using the official cord and charging brick? That can make a difference. If not what are the specks of the brick you are using?
Click to expand...
Click to collapse
Another new piece of information discovered today: The high-pitched whine only happens when the battery is 100% AND when the screen is on. When the screen is off, everything is fine.
So far I have tried:
1. Directly plugging into the outlet the stock Nexus 7 charging brick & cord.
2. Using the following bricks: Stock charger, Anker 40W 5-port USB charger, Amazon Kindle charger, Moto G stock charger. I've also tried all the cables that came with these devices as well as any other microUSB cables I've got lying around the house.
3. My device is not hot at all, and neither are the chargers.
Thanks a lot for your help so far! Looks like what I need to do is to turn the screen off to charge my device, and then unplug it when I want to turn the screen on & use it.