Hi all,
all computers stopped recognizing my N4 as an usb device or android debugging device. No notifications pop up on the phone when connected too.
I tried 2 different PCs and 4 cables.
Fiddling with the phone, I discovered that it shows AC charging (in ampere app) instead of USB charging, and it's pulling 700+ mah, which I think it's a bit too high for an usb charge.
Is it an hardware problem? What can I try?
Forgot to add that I'm running stock 5.1.1, not rooted.
Attaching some screenshots
Related
I'm running:
GEN2
Rooted
ClockworkMod
Swedish Spring Android 2.2 with Gingerbread theme and circle battery
Suddenly after a few weeks of everything working fine, AC charging stopped working. USB charging still works perfectly, and when I plug the phone in it says it is AC charging, but the charge level barely changes - it can be plugged in for 12 hours and not gain or lose any charge. Also, sometimes but not always, the phone becomes very very slow, and sometimes the screen won't unlock - I have to unplug it, unlock, then plug it in again.
I've tried different chargers and cables and combinations thereof, I've tried turning USB charging off or on in Extra Settings, I've tried debug mode on USB or not, hardware acceleration on or off, I've tried charging with the phone off or on, screen on or off, I've tried charging it for 48 hours, the charge level never moves.
This is the closest thread I can find on the issue but it is a mix of problems, and they never find a reliable diagnosis or solution:
http://android.modaco.com/topic/336...rs-stopped-working-but-usb-charging-works-ok/
I don't care if it charges slowly, I'm thinking of trying to mod a USB cable to force it into USB charging mode. Anyone know how?
I far prefer this to re-installing because whenever I connect my phone to my laptop it immediately bluescreens, (despite a fresh Win7 reinstall), and I am lost on my gf's Mac.
These posts describe how to do the opposite (force AC mode) on HTCs:
http://winhlp.com/node/855
http://forum.xda-developers.com/showthread.php?t=844284&page=3
Thanks enormously for any tips
Chris
Since I lost my charger and had to use a generic micro-USB charger, I have the same problem. USB charge works fine.
May be a problem with the USB cable, have you tried using another one?
(I'm on Ginger Stir Fry, but I don't think it is ROM dependent. )
Thanks for the thoughts. I've tried different cables and chargers and combinations thereof to no avail, hence suspecting something software and looking to mod a cable to force USB mode.
Please anyone know what PINs indicate laptop USB rather than AC USB?
How does my phone know to go into the (disfunctional) AC mode?
Thanks
I think D+ and D- pins (2 and 3) are connected. You would have to mod the charger. Or just use generic USB charger, like those from dealextreme...
Seems a bit odd but my Nexus 7 (1st Gen) will not charge when connected to a USB wall outlet. But it has no issues charging when connected to a desktop/laptop.
The following I have tried:
- I have rebooted, shutdown, booted into the boot loader and shutdown/rebooted from it into the OS
- I have tried several USB wall power adapter range in amps output from 0.7 to 2.0.
----Also tried 4 different USB cables with the USB wall power adapter.
-Enabled/disabled developer mode along with USB debugging mode
-Tried charging the unit when it is OFF and ON, only charges when connected to a USB port on a desktop/laptop
-Removed the back cover to see if the USB port could be loose, looks and feels securely in place
Not sure if it could be a software issue, unit is running 4.3 build number JWR66Y. I am hoping to avoid resetting the unit but if I have to I will.
Thoughts anyone?
Is your device rooted? If yes, then try to change the ROM (make a nandroid first).
Sent from my Nexus 7 using XDA App
maybe this shud work for u , it worked for me
wipe cache partition from CWM Recovery
http://canvas2update.blogspot.nl/2014/11/not-connecting-as-usb-storage-only.html
I would say if your rooted and cutomed and all that try a different kernel before a whole new rom. Kangaroo kernel first page of dev page is good.
Mine gets stuck sometimes. I installed battery monitor widget to see the actual current flow when charging. Even though it shows ac connected the graph can remain flat with no charge. Replugging the cord a few times gets it going. A charge only USB cord might help, but I've gotten the best amperage with the included cable so far.
I have a serious issue with my Nexus 7 2012. I put CM11 on it and all was great. The power got down to 11% on me, so I plugged it into my computer. I noticed it wasn’t charging, MTP didn’t kick in, and I couldn't get into ADB. I figured I’d screwed up the USB port. I tried different cables all with the same results. I turned the tablet off and plugged it in and the battery started charging. I couldn’t get MTP or PTP to work nor could I get into ADB after it was charged. I did a factory reset, clearing everything, and reinstalled. Same issue.
I can use my OTG cable and TWRP to install software on the tablet. I tried AKOP ROM. It allows me to use my OTG cable but the tablet doesn’t charge. I try to toggle MTP to PTP or turn off USB debugging and the tablet locks and reboots. I try to turn off the developer options toggle and the tablet locks and restarts.
Help! I don’t know what to do with it. I've searched all day.
Check the basics. When you plug your N7 into your computer, are you using a USB 2.0 port? Is it directly mounted on the computer's motherboard (i.e., a rear port)? Are the proper drivers installed so your N7 is recognized as a Nexus 7?
USB specifications only provide .5A power, v. 2.0A power from the AC charger. Get your N7 fully charged,then get back with whether it locks and reboots.
exglynco said:
Check the basics. When you plug your N7 into your computer, are you using a USB 2.0 port? Is it directly mounted on the computer's motherboard (i.e., a rear port)? Are the proper drivers installed so your N7 is recognized as a Nexus 7?
USB specifications only provide .5A power, v. 2.0A power from the AC charger. Get your N7 fully charged,then get back with whether it locks and reboots.
Click to expand...
Click to collapse
Thanks for the reply. Yes. I've done all of that. Multiple computers, multiple cables, multiple chargers. The Nexus is at 100%.
Here's the exact issue I have now: http://forum.xda-developers.com/showthread.php?t=2536272
Well. I'm going to say disregard. My searches show that a craptastic 12 volt car charger probably hosed the N7's mother board. I'm going to try one more fix but I'm sure it's toast.
So, I apparently did something very stupid with my new Nexus 7.
I have a few 1 TB external hard drives, which don't get enough power via an OTG adapter from the Nexus 7 to run. So, I purchased a two into one cable -- that is, a cable that combines two male USB A plugs into one Micro USB B plug so that a USB 3.0 hard drive can use two USB 2.0 ports to have enough power. I had planned to use this to enable use of the hard drives with the Nexus 7 while traveling by plugging one cable in the tablet and the other into a charger.
When I got the cable I tested it by plugging one of the USB A plugs into my Nexus 7, and then I plugged the other into my computer's USB port. The Nexus 7 promptly shut down, the computer complained of a power surge on the USB port, and a distinct smell of melted plastic came from the computer's USB port. I guess the combining cable didn't combine so much as it just acted like a double headed male A USB cable and shorted things out?
The Nexus 7 refused to restart afterwards until I it plugged it into its charger. It works now, mostly. However, if its battery charge is above about eighty-seven percent then it always reports that it is charging, regardless if it is plugged in or not. And if I plug it into a computer while it is reporting that it is charging I have to restart the tablet to get it to connect to the computer -- I guess it thinks it is connected to a charger and doesn't bother checking for a data connection unless restarted.
The level where it stops thinking it's charging varies somewhat -- I've had it still claim to be charging all the way down to eighty-two percent charge, and by repeatedly opening the battery app over and over again I have been able to get it to notice that it's really not charging all the way up to ninety-one percent, but no higher, and I have to open and close the battery app an increasing number of times for every percent that it goes up over eighty-seven before it will notice it's not charging.
Any idea what kind of damage I'm looking at? How to fix it? Whether I can get the warranty people to fix it free of charge? If yes, whether they will send me a new one or just fix the one I have? Whether it's worth getting fixed since it mostly still works, and doesn't really bother me as long as it doesn't get worse?
Nothing?
Nothing from anyone?
Try replacing the internal USB plug? About $25. Easy to do your self.
S7 edge exynos variant, always show USB charging so charging slow all the time using USB even tried few charges n cables.
OTG power up the pendrive but no detected by the device.
Tried a new charging port yet still the same issue...
Anyone encounter same issue?
Me too have a similar problem
I have TWRP; so, I can flash custom ROMs,
pc cannot identify the phone,
OTG doesn't work.
NO fast charging - charging take around 4-5 hours, the phone always show USB charging
WIreless charging working (Including fast wireless charging)
it almost for more than a month
First, I thought some USB problem
SO, When the display is broken I changed it with a display with the frame which also comes with new USB.
Still no change, slow charging and no OTG
- I tried several ROMs & Kernels
- changed USB setting in developer setting
still problem not solved.
IS it hardware related or software related problem?
I have this problem with my g935a. No longer quick charge by cable, and PC unable to recognize.