Database Users

Somebody tell me Wtf just happened

So my n7 ran out of power I turned it on and my wallpaper had been reset then voltage control started up and the whole tablet went crazy and the screen went solid grey?!?!
Edit: seems to be voltage control when it starts on boot. Anybody else have this problem?
Sent from my HTC One X

I've just had a funny do with mine.. playing games while plugged in to charge, seems I was using more power than it was drawing tho and the battery went - but when it did, the screen went a scrolling grey (bit like the old loading screens on a ZX Spectrum!) and making a crackly static noise. Plugged the plug to kill it, and I'll give it time to charge properly before turning it back on again

Same here I was using my nexus 7 while it was plugged on my PC and looks like my battery was discharging instead of charging looks like the tablet itself eat more battery then a charge would give x)
Sent from my Nexus 7 using xda premium

jamesst20 said:
Same here I was using my nexus 7 while it was plugged on my PC and looks like my battery was discharging instead of charging looks like the tablet itself eat more battery then a charge would give x)
Sent from my Nexus 7 using xda premium
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For a proper charge it needs 2 amps. Your computer only gives half an amp.
Of course it will discharge if you only supply it with a quarter of the power.

Seems to be that when overclocked it needs battery to work properly!
Sent from my Nexus 7 using xda app-developers app

scooby359 said:
I've just had a funny do with mine.. playing games while plugged in to charge, seems I was using more power than it was drawing tho and the battery went - but when it did, the screen went a scrolling grey (bit like the old loading screens on a ZX Spectrum!) and making a crackly static noise. Plugged the plug to kill it, and I'll give it time to charge properly before turning it back on again
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Click to collapse
the exact same thing happened with mine. I was using motorola charger while playing games, and encountered the grey screen with the static noise. I panicked for a sec there!! After all I've only been using it for a day.
Charged it using my HTC charger and turned it back on. I checked the battery monitor widget and found out that my motorola charger delivered very little charge to the device. Googled about it and read somewhere that N7 is quite picky in terms of charger.

They're very picky about chargers. One charger that works really well and is available off the shelf for $25 is the Asus transformer prime charger available as places like office depot, and other retailers, probably staples and best buy.
The power spec of 2 amps required is correct, but even with 2 amp and higher output specs on the charger, many USB chargers with equal or higher specs still will only very slowly trickle charge because the N7 is so finicky about power sources.
Sent from my ADR6425LVW using xda premium

First time it happened to me I thought I bricked the thing. I wasnt even using it and when I came back to take it off the charger it the tablet was flipping out (im guessing i had some weird battery drain and a charger problem at the same time).
Shouldn't the tablet shut down before it gets that low on battery? It would've saved me the almost heart attack I had when I saw this happening.

will444 said:
Seems to be that when overclocked it needs battery to work properly!
Sent from my Nexus 7 using xda app-developers app
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Lmao I was overclocked to 1.8GHz too xD might be the reason
Sent from my Nexus 7 using Tapatalk 2

[Q] Nexus 7 does not charge while on.

My Nexus 7 is no longer charging while turned on. If I power it off it'll charge with the battery symbol. I can't even get my PC to recognize it while plugged in to USB. I'm using the stock charger and cable. Any thoughts?
I'm currently running Paranoid Android 2.54, however when this started I was on 2.50. I thought flashing a newer version might help.

Not charging
Plus 1 on this issue,
Running stock ROM and it updated yesterday to version JOP40C now it's only charging when turned off.

+1, same here, but now it won't charge as the battery got completly drained.

Still does not charge. This is a launch N7, curious if Google will replace it.
Sent from my Nexus 4 using xda app-developers app

I just received a replacement seven this week for the same issue, mine stopped charging. I called google play customer service, and they didn't give me a hastle at all.

Were you rooted/running a custom ROM? I am, and with my N7 not getting recognized I feel like flashing back to stock might be problematic.
Sent from my Nexus 4 using xda app-developers app

darksonic said:
Were you rooted/running a custom ROM? I am, and with my N7 not getting recognized I feel like flashing back to stock might be problematic.
Sent from my Nexus 4 using xda app-developers app
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yea, rooted, custom ROM and kernel. doesn't matter though, it just started one day randomly. I finally did get it to charge BTW, by giving it a few firm smacks on the back. they didn't even ask if it was with root or if it was a custom ROM. if its hardware related, it won't make a difference. i sent it back with twrp recovery, rasbean jelly rom, and trinity kernel. i did wipe the data and the storage before i sent it in.

Yeah my Nexus' charging is messed up since 4.2. Battery seems to run down extremely quickly (around 30% in two hours with Spotify on and general browsing.) Plugging it into the wall with the official charger sometimes charges it EXTREMELY slowly, and sometimes just says its charges and still the battery is running down.
It happened to charge last night, and over the course of around 10 hours, I think I had 60% battery. Trying to charge now, and nothing, just losing battery. No idea what the issue could be. Tablet completely stock.
Sent from my Nexus 7 using xda app-developers app

+1 on this issue. N7 isn't charging when turned on, no charging issues if turned off. It isn't recognized when connected to a PC. Whenever I try switching users, the darn thing restarts itself. It does the same thing when I try USB debugging. I am running 4.2.1.
Please help!

Investigated problem
After upgrading to 4.2.1 my N7 charged very slowly. Finally today I decided to investigate it, albeit inaccurately.
Plugging a 2A charger into my 120V power monitor, I noticed the following:
When the N7 was on, the power draw continually alternated between 0 watts and 2 watts.
When the N7 had been shut down from the bootloader (not from the OS) and the cable plugged in/out, the power draw was a constant 2 watts.
The max charging rate of the N7 is around 10 watts.
So it looks like the N7 is will charge either very slowly, or kind of slowly. What I find strange is that this issue only occurs on some devices. Perhaps later devices use a different charging controller?
Either way, would really like a fix for this.

__Adam said:
After upgrading to 4.2.1 my N7 charged very slowly. Finally today I decided to investigate it, albeit inaccurately.
Plugging a 2A charger into my 120V power monitor, I noticed the following:
When the N7 was on, the power draw continually alternated between 0 watts and 2 watts.
When the N7 had been shut down from the bootloader (not from the OS) and the cable plugged in/out, the power draw was a constant 2 watts.
The max charging rate of the N7 is around 10 watts.
So it looks like the N7 is will charge either very slowly, or kind of slowly. What I find strange is that this issue only occurs on some devices. Perhaps later devices use a different charging controller?
Either way, would really like a fix for this.
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Click to collapse
From the way you described your test setup, you seem to be measuring the power consumed by the charger itself on a 120 VAC source. The wattage there should be low, albeit still higher than what you're seeing. Along that line, if you ever see it go up anywhere near 10 watts, then something has gone horribly wrong.
Also, the slow charging seems to be peculiar to 4.2 and above, indicating that it is not actually a hardware issue.

same!
Been having the same problem for a few days now, I was on stock 4.2 and updated today to a custom ROM based off of 4.2.1 and there is still no difference. Anyone found a solution yet?? Its quite concerning especially since I got mine from GameStop in the US then moved to the UK shortly after!
Just wanted to add, before this started I was having the same problem that is talked about here http://forums.androidcentral.com/google-nexus-7-tablet-forum/228706-nexus-7-problem-wont-charge-when-does-screen-goes-dead-pixels-fly-across-screen.html
I figured it was caused by letting the battery drain completely so I opened it up pulled the battery plug out, plugged it back in and charged it till it was full and it continued to work. haven't let it die since.

Same problem here, stock Nexus 7 running 4.2.1, roughly 2 months old.
It charges when the device is turned off, but will not charge when powered on -- started happening about 2 weeks ago (charged fine previously). This is using the stock brick and cable that came with the tablet.
I have to imagine that this is a software issue and that the next one will have a similar problem -- has anyone else swapped one out and had the problem disappear with the new one?
dave

Problem with music output to car stereo

Hello. Just a few days into my Nexus 4 experience with Straight Talk. Loving it!
However, I do have one problem. Whenever I plug my phone into the car stereo via cable (headphone out to aux. in), I get a lot of shrilly interference. It's a mixture of a hum and high pitched noise. I didn't have this problem when listening to music from my Milestone X. My friend doesn't have the same problem when plugging in his iPhone. Just my Nexus 4. I currently use both PowerAmp and Google Play Music players.
Any ideas?
I'm running stock 4.2.1, rooted and unlocked.
Regards.

No one else experiencing the same issue?

I had no issues with mine, maybe you should try another adapter and see if you run into the same issue.
Sent from my Nexus 4 using xda app-developers app

enigmaco said:
I had no issues with mine, maybe you should try another adapter and see if you run into the same issue.
Sent from my Nexus 4 using xda app-developers app
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I'm just using a cord that plugs into my headphone jack and into the AUX of the radio. There's no interference when I use my old phone or my friend uses his iPhone. It's just with my N4.

You have a ground loop that is causing the audio garbage. Is your phone charging at this same time? If so, try disconnecting it from the charger.
Ground loops can be lifted in a number of ways depending on where the problem lies. If it is charger related, getting an isolated power supply to charge your phone will be the best fix. I use a 2 amp model from DaqStuff.
If it happens without the charger, the simplest fix is an audio transformer coupled audio cable designed specifically for this purpose.

N4 massive battery issues

Or more like charging issues?
I've got this phone in December and I'm pretty satisfied with it. The only thing that kinda annoys me is the fact that my phone often won't charge properly and I'm not sure if it's because of the charger (the one that comes with the Nexus) or the battery.
When I charge it, it says that it's charging. Just like it should be. The problem is though, that it's not really charging. A few seconds later it says that it's discharging, not even a second later it's charging again, then discharging and it goes like that all the time. I'm almost sure that this harms my battery a lot. When I let it charge over night, most of the time the battery level is under 100% (50-60% are more likely) and that is kinda frustrating when going to work.
So I want to know: does anybody have the same issue or something similar? Or do I just have a faulty device/charger? This issue has been plaguing me for around a month now.
Sent from my Nexus 4 using xda app-developers app

xExabyte said:
Or more like charging issues?
I've got this phone in December and I'm pretty satisfied with it. The only thing that kinda annoys me is the fact that my phone often won't charge properly and I'm not sure if it's because of the charger (the one that comes with the Nexus) or the battery.
When I charge it, it says that it's charging. Just like it should be. The problem is though, that it's not really charging. A few seconds later it says that it's discharging, not even a second later it's charging again, then discharging and it goes like that all the time. I'm almost sure that this harms my battery a lot. When I let it charge over night, most of the time the battery level is under 100% (50-60% are more likely) and that is kinda frustrating when going to work.
So I want to know: does anybody have the same issue or something similar? Or do I just have a faulty device/charger? This issue has been plaguing me for around a month now.
Sent from my Nexus 4 using xda app-developers app
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Have you tried it with another charger? I always use a universal charger and that works fine. If that doesn`t help it is probably a hardware issue and you`ll need to get it fixed.

AW: N4 massive battery issues
Unfortunately I don't have any charger with an output of 1.2A. All of them are under 1.2A and most are broken anyway (also chargers from my last phone, LG Optimus 2X). Seems like I'm just not that lucky when it comes to chargers.. I'll try to find one though. Thanks for the reply.
Sent from my Nexus 4 using xda app-developers app

Just to test it, use your computer usb. It isn't full power but it is enough to see if there is an issue. Maybe a new cable?

AW: N4 massive battery issues
Not sure if this is related to my computer now but when I plug it in it says charging and as soon as the MTP notification pops up it doesn't charge anymore.
Should I try to fully discharge my battery and then recharge it?
Sent from my Nexus 4 using xda app-developers app

AW: N4 massive battery issues
Okay so I somehow fixed it.. most likely temporarily but it seems like the issue is the cable. I pretty much "straightened" the cable with my fingers (was applying pressure to the cable and then went slowly downwards) and that apparently worked o_o..
Now it's been charging for 15 minutes without disconnecting once. I hope it'll remain like that..
Sent from my Nexus 4 using xda app-developers app

Stock Bugs

Hello friends I found a bug. I am running stock rooted, locked bl from update. Phone was turned on and plugged in at 98% charge. I decided to power down so I could unplug and plug it back on in to top off the battery like we did on the dinc before I go out for the evening. . I chose this phone because of it is a similar compact size and sturdy build as the dinc, and at the time I did my research the motom seemed like a great value with cyanogenmod support as well as cwm/twrp bootloader choices. Now I am faced with a bootloader that cannot be unlocked and I miss out on the innovations that this amazing developer community has blessed us with. Is it Motorola or the NSA? I am not allowed to charge my phone with it powered off. I have never had this happen before.. Anyone else have this problem? I find it strange that if your battery is nearly charged you must turn it on if you want to have it plugged in.
Sent from my XT907 using xda app-developers app

zombolt said:
Hello friends I found a bug. I am running stock rooted, locked bl from update. Phone was turned on and plugged in at 98% charge. I decided to power down so I could unplug and plug it back on in to top off the battery like we did on the dinc before I go out for the evening. . I chose this phone because of it is a similar compact size and sturdy build as the dinc, and at the time I did my research the motom seemed like a great value with cyanogenmod support as well as cwm/twrp bootloader choices. Now I am faced with a bootloader that cannot be unlocked and I miss out on the innovations that this amazing developer community has blessed us with. Is it Motorola or the NSA? I am not allowed to charge my phone with it powered off. I have never had this happen before.. Anyone else have this problem? I find it strange that if your battery is nearly charged you must turn it on if you want to have it plugged in.
Sent from my XT907 using xda app-developers app
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You should be able to charge it with the phone off. I can do it on my phone. When you plug it in, you probably won't get a light or anything, but if you just tap the power button, you should get a charging animation.

On my droid 4 and og RAZR if it wasn't an OEM charger it would not charge when off or completely dead but that was on GB and resolved when ICS came to it... maybe try another charger...
Sent from my XT907 using xda app-developers app

how are you charging it? plugged in with the OEM cord or another cord? plugged into an outlet or PC USB?
I have never had an issue with charging when plugged in via OEM cord to an outlet.